Solenoid valve environmental conditions

The maximum and minimum temperatures of the environment should be selected within the allowable range, if the tolerance required for special order.
2 environment with high relative humidity and water droplets rain and so on, should be selected water solenoid valve
3 environment often vibration, bumps and shocks occasion should choose special varieties such as marine solenoid valve.two position three way valve
4 in the use of corrosive or explosive environments should be given priority in accordance with the safety requirements of selection of anti - hair loss
5 environmental space is restricted, please use the multi-function valve, because eliminating the need for bypass and three manual valves and easy online service.direct acting solenoid valve

Solenoid valve power conditions

1 power supply types were selected to AC and DC solenoid valve. In general access to convenient AC power.
The 2 voltage specifications used as preferred AC220V.DC24V.
Supply voltage fluctuations are usually selected +% 10% -15%, DC to allow ±% 10, should the ultra poor, regulators should take measures or make a special order requirements.two position three way valve
4 should be selected according to the power capacity of the rated current and power consumption. VA should be noted that when starting the exchange value is higher, lack of capacity should be preferred indirect electromagnetic valve.direct acting solenoid valve

Solenoid valve control accuracy

An ordinary solenoid valve is only open and closing two locations in the control precision is high and parameters for a smooth selection of a number of solenoid valves; Z3CF three normally open solenoid valve with Weiqi, fully open and close the three kinds of traffic;high temperature solenoid valve
ZDF-Z1 / 1 combination of multi-function solenoid valve is fully open, Grand Cayman, Little Cayman, open all four types of traffic.
2 Action: connect or disconnect signal to the main valve action completion time, our patented multi-function solenoid valve opening and closing times were adjusted, not only to meet the control precision, but also to prevent water hammer damage.
3 leakage
On the given sample leakage values ​​for common economic level, if too high, please make a special order.standard air cylinder

The reliability of the electromagnetic valve

1, working life, this is not included in the the factory pilot project, is a type of pilot projects. To ensure the quality should choose the regular manufacturers of brand-name products.high temperature solenoid valve
2, Operating mode: long-term work, repeated short-time working and short-time work three. The conventional products are long-term work system, that coil to allow long-term power. Valve opened only short-term closure for a long time, are advised to use the normally open solenoid valve. Used in short-time working and quantities
Is large, you can make a special order to reduce power consumption.
3, the operating frequency: the frequency of demanding action, the structure should be optimized direct acting solenoid valve, the power to listen to the exchange preferred.
4, operating reliability
Strictly speaking, this test has not been officially included in the professional standards of the country solenoid valve, should choose the regular manufacturers of brand-name products to ensure quality. Not much movement on some occasions, but very high reliability requirements, such as fire, emergency protection must not be taken lightly. Particularly important should also take two used in conjunction double insurance.standard air cylinder

Solenoid valve economy

It selects one of its scale, but must be in a safe, suitable, economic and reliable basis.
Economy is not only the price of the product, but also to give priority to their functions and quality of installation and maintenance, and other accessories required for the cost.pneumatic hand valve
More importantly, a solenoid valve in the automatic control system in the automatic control system and even the production line share of the cost is minimal, if cheap and wrong the early damage group is huge.
Installation Notes are as follows:
1, the installation should pay attention to the arrow on the body should be consistent with the medium flow. Thou shalt not put in place to direct dripping or splashing. Solenoid valve should be installed vertically upwards.
2, the solenoid valve should ensure that the supply voltage is 15% -10% of the rated voltage fluctuation range of the normal work.
3, the solenoid valve is installed in the pipeline may not have a reverse pressure differential. And the required power for several times, officially put into use before the optimum temperature.
4, the pipeline should be thoroughly cleaned before the installation of the solenoid valve. Pass into the media should be free of impurities. Valve installed before the filter.
5, when the solenoid valve failure or cleaning, to ensure that the system continues to run, should be installed bypass device.
Trouble Shooting.stainless steel pneumatic cylinders

Solenoid valve power does not work

Check the power wiring is bad → re-wiring and connectors to connect
Check whether the supply voltage is in the range of ± work - → tone caused by normal position range
The coil whether sealing off → re-welding
Coil short → Replace the coil
Working pressure is inappropriate → adjust the differential pressure → commensurate with or replace the solenoid valve
Fluid temperature is too high → Replace the solenoid valve commensurate
Impurities solenoid valve main spool and dynamic core stuck cleaning → if the seal is damaged replace the seal and install the filter
Liquid viscosity is too large, the frequency is too high, and life replacement product to →pneumatic hand valve
Solenoid valve can not be closed
The main spool or moving iron core seals damage → Replace the seals
Fluid temperature, the viscosity is too high → counterparts replacement solenoid valve
Cleaning impurities into the solenoid valve spool production or moving core →
Spring to life or deformation → Replace
The throttle Kong Pingheng clogging → timely cleaning
Working frequency is too high or too the life → reelection products or updated products
Other
Internal leakage → Check the seals for damage, the spring assembly of non
The external leakage → loose connections or seal has been broken → screws or replace the seals
Energized noise → chieftain fasteners to loosen and tighten. Voltage fluctuation is not within range, adjust the voltage. The core pull surface impurities or uneven, cleaned or replaced in a timely manner.stainless steel pneumatic cylinders

Air conditioner solenoid valve failure

The solenoid valve heat pump air conditioners for cooling and heating to convert electromagnetic switching valve control, belonging to two four-way valve. Is composed of three parts of the main valve, the pilot valve and the solenoid. Air conditioners and refrigeration systems, in addition to outside the compressor process is the most complex, the most sophisticated components, but also to check and repair trouble, it is difficult to judge good or bad, not easy troubleshooting a part. In addition to the control circuit failure common faults for the heart valve does not operate, blockage, leakage caused by the slider does not move or action is not in place.
Failure phenomenon
1 solenoid valve commutation
If the heart valve or the slider can not move, and fixed in one position, the air conditioner cooling or heating not interchangeable. Generally the most common faults for only cooling, not heating, and cause air conditioners anti chilling by cold air protection, the outdoor unit running, the indoor unit is not blowing hot air, fault light after shutdown.steam solenoid valves
2 solenoid valve coil short circuit
Air conditioner conversion heating operation, the solenoid valve coil due to short-circuit current is too large, severe burn control board fuse or cause tripping, causing the machine is not working properly.
3 solenoid valve slider deformation
If the distortion in the slide, even if the solenoid valve coil is energized, the pilot valve valve core will not operate, causing the slider to change the inside of the valve body to not in place, string gas compressor high-pressure gas to form a short cycle, caused by the high temperature, high pressure until frequent thermal protection, and ultimately burn out the compressor insulation layer. For the entire system, high pressure cut-off valve to the low pressure side leakage, high / low dropout voltage decreases. Usually presents no refrigeration, no heating or poorly.flange solenoid valve

Cause and removal of solenoid valve

Solenoid valve coil open circuit, short circuit or burn, heart valve can not pull, causing the slider does not move. Should be replaced.
Solenoid valve armature is stuck and can not move, causing heart valve slider is not action. Open a valve cleaning adjusted.
3. Supply voltage drops below the solenoid valve below the rated value, the solenoid valve outlet pressure difference exceeds the open valve capacity, "da da" is often issued when the valve noise, caused heart valve pull on. The power supply should be improved.steam solenoid valves
4 solenoid valve flows installed upside down, causing heart valve does not operate. Should be adjusted to the flow direction.
System temperature, high pressure and machine impurities, causing distortion in the slide, stuck. Should be replaced as well.
6. The remanence suck valve heart or heart valve is stuck solenoid valve can not be closed after power failure. Cleaning adjustments, such as the effect of replacement.flange solenoid valve

Solenoid valve gasket damaged or loose screws loose

Caused by the refrigerant leakage. Change the gasket and tighten the screws.
The valve capillary blockage or rupture; serious leakage caused by the slider does not operate. Cleaning capillary fracture capillary copper tube welding or thicker.
Dirt, the valve seat or valve needle valve memory impairment, and the spring force is too small, causing the solenoid valve closed lax. Clean and adjust or replace the spring.mini solenoid valve
In addition, if the solenoid valve internal leakage, caused by the high-pressure refrigerant gas leakage to the low-pressure side, the solenoid valve can not make both ends of the piston to establish a normal pressure, it should replace the solenoid valve. If the cooling system pressure difference is too large, it can not be the solenoid valve commutation, it is necessary to check the cooling system pressure or find a leak, and fill the refrigerant. If not action or action of the four-way valve slider is not in place, for examination to determine when the end of the screwdriver wooden handle, gently tap the valve body, from time to time to turn on or off 220v AC power supply, repeated several times to hear the armature suction chorus and the valve body gas commutation sound, you can determine when the solenoid valve is returned to normal.pneumatic auto drain

Ball valve according to the classification structure

The ball valve can be divided into 19 categories, floating ball valve, fixed ball valve, metal seal valve, V-ball valve, wafer type ball valve, jacketed ball valve, pipeline ball valve, track ball, the coat ball valve, pigging valve, high pressure forged ball, tee ball, thread ball valve, the overall ball valve, cryogenic ball valves, bellows, ball valve, eccentric ball valve fully welded ball valve, special ball (Stone).mini solenoid valve
Floating ball valve
The valve ball is floating, under the action of pressure of the medium, the sphere can produce a certain displacement and pressed against the sealing surface of the outlet end to ensure that the outlet end of the seal.
Floating ball valve simple structure, good sealing, but the ball all to pass the exit seals to withstand the load of the working medium, so to consider the ring material can withstand the load of the media sphere. This structure, widely used in low-pressure ball valve.pneumatic auto drain

Fixed ball valve

The ball valve is fixed, the compression is not generated after the move. Fixed ball valve with floating seat, by the media pressure, the valve seat is moved, the seal is pressed onto the ball, to ensure the sealing. Usually with a sphere on the upper and lower axis with bearings operating torque is small, the valve suitable for high pressure and large caliber.solenoid valve actuator
In order to reduce the valve operating torque and increasing the reliability of the seal, in recent years the valve seals, both in the sealing surface pressure injection of a special lubricant to form a layer of film that enhances the seal, but also reduce operating torque , more suitable for large-diameter high-pressure ball valve.shut off solenoid valve

Elastic ball ball valve

The ball valve is elastic. Ball and seat ring are made of metallic materials, sealing pressure than the large, rely on the pressure of the media itself has reached less than sealing requirements, must be an external force is applied. This valve is suitable for high temperature and high pressure medium.
Elastic sphere is an elastic slot open at the lower end of the inner wall of the sphere, and flexible. When the closed channel, the sphere rose stem wedge-shaped head compression to seal the open seat. First release the wedge-shaped head before rotating sphere, the sphere is restored with the original prototype, the small gap between the ball and seat, can reduce the sealing surface of the friction and operating torque.pilot valves
The ball valve can be divided into straight-through its channel position, tee and right angle. Tee and right-angle ball valve for the distribution of media and change the flow of the medium.shut off solenoid valve

Valve in the water supply system connector

Plug and valve function together for one, can be used as a plug for hydrostatic test Buried do not have to remove, but also as a connection pipe connection and tap or other water equipment, but also as automatic shut-off valve to facilitate replacement or disassembly of wearing parts (such as faucets, water purifier).
BACKGROUND ART air cylinder manufacturers
Housing indoor water supply pipe is mostly concealed, the pipeline implicit spacious, will want to install the faucet parts plug stuffed pressure experiments, after passing the test, the pipe is hidden, just plug the exposed wall. Developers or households basically the end of the renovation, removal of the plug by turning the faucet, with water connections. At this time, due to the time, materials, construction and other reasons, the plug is not easy to remove, often mandatory demolition, so the pipeline, especially in the interface area greater damage. Buried decoration basic end rework the difficulty and economic losses, rework reluctant to use tube interface parts of seepage, leakage is inevitable, there will be a common wall paint discoloration, blistering, loss, contrast contact moldy wood board paint off. Damage to the faucet, you need to turn off households into the shut-off valve to be replaced the damaged faucet is removed, the water in the pipes will be a loss, water for other parts of the pipeline system, after the re-installation of the faucet also open into the family after the cut-off valve to the water, resulting in the loss of time, if it is a high-level public spaces, resulting in loss of time, inconvenience, waste of water resources will be even greater.3 way air valve

Valve technology program

By the outer tube, stem, seals composition, the outer tube, the stem hard materials manufacturing, seals of a resilient material; outer tube made with other connector end of the external thread interface connection with the taps the end made within threaded connection ;
The inner wall of the outer tube empty into a dumbbell-shaped inlet side of the cylinder, the inlet side of the cone, through the water column surface, the water side of the cone, the water side of the cylinder;
The outer tube stem, stem from the water inlet cone, the connection string, the effluent end cone, cone and water-side water inlet cone cone top opposite, by connecting column;electric solenoid valve
Stem water inlet cone cone fixed ring (1), fixed the water-side cone conical bottom of the stem seal (3), seals (2) is mounted within the outer tube water side of the cone with the stem between the outlet end of the cone, ring (2) after installation in compression or in the ring (1) no pressure in compression ring (1), (2) cross-section O-seal ring (3) section of the square;
Tapered surface and the outer ring (1) for closing the inlet end cone stem tapered surface gap between the inlet side of the tapered surface of the outer tube, the sealing ring (2) for closing the effluent end of the stem cone tube effluent gap between the side of the tapered surface, the sealing ring (3) for the gap between the bottom surface of the effluent end cone of the closure stem faucet inlet;
The outer tube, the stem, after the completion of the seal assembly, the seal ring (1), (2) a state of compression;
Ring (2), the gap between the water source of the water column surface with connecting column can pass effluent from the stem end of the cone opening hole water by not less than 1;
Ring (1) tap water or ring (2) bring pressure generated by axial compression is less than faucet installation to promote stable core columns axial movement.3 way air valve

When the valve is turned on, water pipes

Water pressure so that the stem to move toward the effluent end ring (1) to increase the gap between the cone the closure stem tapered surface of the inlet end cone and the outer tube inlet side, water can not be passed, the tube from the valve plug .pneumatic fitting
Faucet installation process, promote the pipe spool column move to the inlet end, the valve is equivalent cut-off valve; faucet water inlet to the water side to move, seals (3) pressure, seals (3) enclosed core column effluent end of the cone the gap between the bottom surface and the water inlet faucet, push the stem moves to the inlet side, the compression ring (2), seals (2) closed core column effluent end of the tapered surface of cone and the outer the gap between the the tube outlet side cone, stem with a ring (1), (3) to move to the water inlet to the seal ring (1) is not closed the stem water inlet cone cone and the outer tube into the the gap between the tapered surface of the water side of the gap, the gap between the inlet side of the tapered surface of the stem tap water inlet cone of the cone and the outer tube, the seal ring (2) with the connection between the columns, to pass the surface of the water column the gap between the connecting column, the effluent from the stem end of the cone to open holes into the faucet valve is equivalent to ordinary pipe joints, open the faucet to water.
Faucet removable, cleaning the faucet to the direction of water movement, pipe valve cores from water pressure and seals (2) under tension to the direction of the water to move the ring (1) by tap water or seal (2) to bring the axial direction of the pressure generating compression amount is less than the faucet mounted to promote stable stem amount of axial movement, the sealing ring (1) closed first stem inlet end cone tapered surface of the outer tube between the inlet-side tapered surface gap faucet and sealing ring (3) separation, the valve equivalent cut-off valve, water can not be, removal or cleaning of the faucet, the normal use of other devices.solenoid valve actuator

Experimental distribution of the corrugated hose fatigue strength

And the lognormal law and Ben6y of law consistent with a wide range of common fatigue test results say obey these laws does not contradict the month t '
As noted in the previous chapter, have a certain statistics Contact between the corrugated hose fatigue damage and stress, but significantly affected by the random nature of the dispersion (up to several orders of magnitude) 040.64). Figure 86 shows a relationship between the corrugated hose fatigue strength and stress. This figure, although a relatively wide dispersion zone, but still subject to the determined probability law. Research these laws can solve some of the problems in the calculation of the reliability index of the corrugated hose.
Although the results of the fatigue test is dispersed, but below it there is a limit, i.e. the sensitivity limit to the number of cycles n. Said. This N. Alternating load time non-sensitive region high pressure hydraulic fittings
Value Ig (N No) normal distribution law is known as the sensitivity limit of the log-normal law, it is taken as the fatigue strength of the true distribution law [49) in the use of this distribution law to determine the N . Can make use of the computer. In order to predict the reliability, in addition to the fatigue of the curved line (or regression line)hose adapters

Surface Modification of the wire hose

The surface properties of the steel wire hose absorbed its decorative the speech effect IMPACT that the surface properties of the steel wire hose leveling wire hose of the break junction citrate formula and molding station Ballet Fu. The one hand, the hose itself, the surface of the wire can contact, especially money in the non-polar polyolefin by carry wire hoses, Shao decorative material, poor adhesion, causes the loading of terrorism material off; On the other hand, steel wire hose molding, molding technology of wood or material amount of wind to the title, the surface will be shrinkage, on behalf of the bubble or by the Qing force Hui, deformation, cracks and other defects. In addition, the the wire hose in the processing molding release Jing used in this process, plasticized Jing anti-electrostatic Jing, lubrication Jing to old age Jing, anti-burning Jing, lubrication Jing, gray wait will I stay in the surface of the steel wire hose products influence the film adhesion. Therefore, before the wire hose mounted terror homogenate ditch the seat surface to go to manage. Soup 2.1 Do not material surface processing method hydraulic banjo fittings
Wire hose before the face validity manager, often need to pre-effective management to remove the oil from the surface of the steel wire hose, gray wait. General wire hose surface pre-rainbow management including skim, in addition to sitting and in addition to static, eliminating the force of the inner bottom and so on.metric hydraulic hose fittings

Corrugated metric hydraulic fittings stress

Welding corrugated metric Hydraulic fittings can work in a variety of state: the role of external pressure and internal pressure can produce a shift, when the ends are fixed, it can feel the pressure and convert it into a force to stop block; also can produce a given displacement arrival stopper block, thus withstand greater pressure.stainless steel hydraulic hose fittings
Studied in order to determine this chapter three types of welding corrugated hose stress distribution along the shaft section, we use a the exported solution of 14. Discussed below two load cases: 1) corrugated hose by stretching of axial force (p = 0; Today.), 2) the end is not moving, the corrugated hose to withstand the pressure and axial force (force equilibrium, potassium p 0; = 0).
I corrugated metric hydraulic fittings in both load conditions, when k = 1.3 and HL h = 10, the relative stress distribution characteristic curve along the shaft section of the diaphragm shown in Figure 56 above. As can be seen from the graph: two load case, are of the bending stress cloud, maximum circumferential direction of the bending stress al distribution similar to the former, but the value is approximately ':. 1/3, the bending stress graph is made in the outer surface of each point. Week to film stress on the flat portion of the diaphragm shaft section cloud: Small; joints close to the diaphragm, it is increased. Having made the film stress at. Than stress 6g. An order of magnitude in the graph have not been indicated.hose adapters

Remove the oil from the surface of the steel wire hose

And arrogant molecule precipitates, the law will not only enable the The steel hose surface roughening uniform, dry junction performance improvement, both in addition to the effect of sitting at the same time. Root saw skimmed Jing carry the the degreasing method can be divided into force seal of skim Law, acid skim Law, dissolved Jing skim Law. Different due to the wire hose insolubility Jing capacity, to discuss different product scale wire hose Diego with different degreasing methods. Wire hose the use skim Jing bottom can not be dissolved, electrically cracking, deformation, etc..
Seal of skim Jing Hong Li-fa, wire hose surface dirt and grease, chien hydrolysis of soluble sodium fatty acid, eight to achieve the purpose of degreasing. The pure liquid Library skim mJ only saponification power vegetable oil, plus a small amount of emulsion engraved, surfactants such as sodium Kong, soap powder, emulsifier OP Jing-by removing the cut oils. Sodium Kong has a strong emulsifying role and saponification, but it's looking for liquid juvenile wash cold, easy to take the next process to form insoluble the hanging the acid condensate limb IMPACT Xu installed bonding force.
Shouting the fa of skim engraved volts fish degreasing sitting ability, suitable for non-polar plastics such as polypropylene and seal resistance wire hose parts surnamed Li, method of member activity, the pollution of the industrial sub-phase discuss smaller, is more common at home and abroad a God, skim surname.
Degreasing temperature root saw the heat distortion temperature of the steel wire hose bowl the skim time root arrogant wire hose parts oil spill case may be, until the force to remove oil ended.stainless steel hydraulic hose fittings
Acid degreasing agent went to the fa acidic degreasing Jing acid absorbed by the Pa acid or meta-machine the surfactant engraved combination. The acid in the acidic degreasing machine bite uniform the wire hose surface sheng oxide to decompose and remove the dirt on the surface of the steel wire hose. Such as polypropylene wire hose surface fingerprints and organic dirt can be the KZ CR2 0 HZSO. The the acidic degreasing Jing went up the acidic degreasing Jing generated newborn Chi oxygen discuss polypropylene strong surface oxidation, surface roughening and generate F-base, m base and Mei base plate groups, improve polypropylene the polarity of the surface of the steel wire hose, Chek Xu installed revolves junction. Due to the the pickling mechanism of chemical anti-Qing, so this God pickling workers Ballet is not suitable for carbonate-containing sheet molding steel wire hose (SMC) Part. Acidic degreasing Jing the surname management process tube, leather energy saving, to extend the use of skim Jing Temple life, gradually with valid grounds for any short, suitable for self-reactive Health and flowers, such as lichen fish.hydraulic adaptors

Extension pipe interface rupture and repair

Suction hose extension pipe today mostly made of ABS plastic thin wall plug, impact resistance, flexural capacity is relatively much worse steel body. Thus, after the collision, the beat easily excluded at the interface crack. Due to the extension pipe is often the 2-3 root connection, so once the interface rupture, extension pipe extension pipe, or other accessories not firmly connected, or not at all connected. Repair this rupture There are many ways one of the ways, first with plastic cracks sticky complement to prevent air leakage, and then solder wire wound rupture the outer end around ten laps or so depending on the length of the actual rupture increase Save), the two ends of the metal wire made of two point to the axis of the hook, hot electric iron in the beginning and end of a metal wire wound at a small hook into the hose, with the adjacent wire weld. So that repair Extension, its strength is even better than the original meters firmly.hydraulic banjo fittings
The fix: self-adhesive polyester film along the rupture estuary cone dry paste 6-7 layers, as shown in Figure 3-i8 (b). Paste hands taut, tight as possible, but before the paste is dry crack sticky complement.
, Soft interface, likes to take a long block and build Shan when the suction inlet suction ball of paper, cotton, and other large garbage, it is easy to the hose interface and take a long tube causing blockage to reduce the suction hose suction or no suction. Dredge to take a long tube, hose interface congestion is very convenient, just need to find a thin wooden stick (bamboo), wear into the blockage, the top of the blockage can be. However, for a class like hose flexible pipe, small aperture and long, to the top of the blockage, it is necessary to wear into the hose with wire to the top of the blockage. However, wear one end of the hose, it should first fold hurried into a round, kill wire to prevent broken hose.metric hydraulic hose fittings

Hydraulic Banjo fittings shown in the type of stress values ​​under

Various alloys made of corrugated hose lapse time value (fatigue strength), customary for corrugated hose with the letter N flag, or using these values ​​of the logarithmic means. The vertical axis represents the distribution of credit values ​​of the function F (the left side of the non-aliquot of the scale), the the aliquots scale on the right is obtained by the integral function F after a certain transformation. In Figure 81, Figure 82 and Figure 84, U is the standard normal law or lognormal law of sub-sites. Tabulated normality regular standard integral function [49} SO)sae hydraulic fittings
The figure shows that the experimental distribution law and two forms right the lognormal law and BeR6y of law is consistent ['). In areas of high stress, the experimental data with the normal rules are also good. Exponentially with the experimental function is completely out of line. Judging from the distribution of the fatigue strength of the corrugated hose, which is characterized by extending rightward directions (or a frequency distribution diagram). The density density than at the start of the fatigue strength values ​​of the variation range at the terminal, that is, the fatigue strength of the corrugated hose A distribution law with respect to the mathematical expectation itself is asymmetric.valve block

limit cycle curve of the hydraulic hose cutting machine

Usually is established with the reference number of cycles corresponding to the material endurance limit. However, for the remaining (relatively small) on the basis of the number of cycles can be made of a similar curve (Fig. 76). If the loop between base 10'-10 '(having a sufficiently dense Level) corresponding to a series of such curves, it can be based on a given V. And the Qm bonds to estimate the fatigue strength of the various non-symmetric coefficients. However, to make a series of similar limit cycle curve, the need for a very large number of corrugated hose test. Resulting in such a problem, i.e. to determine whether the findings according to any one cycle fatigue strength when the pulsation cycle (say) work in the case of a variety of non-symmetrical coefficients of the fatigue strength of the corrugated hose. To this end, it is necessary to have a way to determine the parameters given the strength of the cycle (rk-0) pulsation cycle (r 20). If their corresponding points are located on the circular curve with a maximum for a given cycle (Figure 76 D point) and the pulsation cycle (B point) that is such strength. To find the unknown Connections between the loop parameter with a variety of non-symmetrical coefficient, we adopted Gail Bell (Fep6ep)-proposed method, the parabola through the feature points A and C as the approximate limit cycles FIG s4.se. Then you can think parabola axis and the vertical axis coincide. Applications Gail Bell simplify the derived limit cycle map, you can get the intensity pulsation cycle parameters of the asymmetric coefficient cycle into the following formula. - corrugated hose material strength limit, 00 - pulsation cycle maximum equivalent stress.sae hydraulic fittings
The above formula is only applicable to those Cr + O. Does not exceed the the corrugated hose material yield limit. (Or rather, should be proportional limit ANU) cycle, because the stress calculation method is available only within the scope of application of Hooke's law.valve block

A variety of work under the fatigue strength of the corrugated hose

With the ratio of the type of work and the pressure and the axial force (or pressure and displacement), the change in the stress of the dangerous point is the same. The stress change cycle can be non-symmetrical cyclic coefficient r to the characterization in the mouth and OR ... - respectively the minimum and maximum stress of the cycle.
Asymmetric coefficient of the cycle fatigue strength of very significant for a way of working, in fact, it is impossible to obtain a single regression equation (53). Therefore, the requirements for a variety of non-symmetric coefficient established links among the parameters of the intensity of stress cycles. If there is a return type of stress cycles optionally a non-symmetrical coefficients equation ((53), then the presence of such linkages can be calculated through the pathway to determine the stress cycle fatigue strength of any other non-symmetric coefficients.socketless fitting
Concept in order to obtain a perfect metal fatigue strength, general purpose is to determine the cycle endurance limit of the metal under stress in a variety of non-symmetrical coefficients, the test result with the limit cycle diagram form [19.41.54.58). In A, the the --- a shield amplitude - cycle mean stress) coordinate system _L limit cycle is shown in Figure 75 below. Line drawn from the origin of coordinates corresponding asymmetric circulation, the line AC intersects the curve corresponding to the limit cycle. The maximum stress limit cycle. Second = a + a. Is the durability limit. For example, in. m-(CF-): If the amplitude of the cycle does not exceed (a): the value, then the specimen is subjected to this material does not occur after the reference cycle frequency and destruction. With the average cyclic stress increases, the maximum amplitude is reduced, and the durability limit improve and thus the danger of the cycle becomes small. The most dangerous loop is the symmetry of the circle.hydraulic manifold block

The reliability of the strength of the corrugated hose

Reliability index corrugated hose is irreversible components, one-time acting elements that failure can no longer be repaired.
In the choice of the irreversible component reliability indicators, on the one hand to it before the expiration of the time distribution law to decide, for corrugated hose that is, the number of load cycles to destroy, but we also need to determined by the scale of production and use of such parts of the corrugated hose; addition, the accuracy and authenticity of identification and control must also depends on the reliability indicators. The reliability index scatter valuation accuracy and authenticity by means of established probability and includes indicators of the true value of the confidence interval to determine the width of the confidence interval [hair magic depends mainly on the capacity of the test.hydraulic hose cutting machine
In order to determine the theoretical distribution law (its best form with the experimental distribution pertinence), to be large enough tolerance test (n> 20); probability paper, a graphical representation of the experimental distribution of the integral function method has been push factory '. If the experimental probability paper approximate a straight line, it would prove that the distribution pattern consistent with experimental data and made probability paper. Intercept and inclination of the straight line in the coordinate axes can be approximately determined by the distribution parameters. Figure 81 --- Figure 85 shows two forms of the log-normal law of probability paper (sensitivity limit N and "sensitivity limit"), as well as in regular irrigation rate paper Bea6yn Normal law of probability Paper and exponentially probability paper-made graphics.metric hydraulic fittings

Some vacuum hose has an exhaust port

Users can access the hose on the exhaust port, the garbage blowing.
There is also a tricky way: thousands of crisp outlet swapped in and out of the hose, open the suction hose to the air inlet of the hose to the alignment of the air inlet of the suction hose, the use of the vacuum cleaner suction easily clogging material to absorb.hydraulic hose cutting machine
Fourth, repair vacuum hose damaged by over-AIDS layer caused by inhalation of acute and sharp waste (such as Swiss broken glass, scrap metal, nails and the like) can easily cut through or puncture the filter layer. The filter layer is damaged, it can not filter the air, the dust will enter the host cavity and damage the host Once the filter layer is damaged, repair or swap a.
There are a lot of suction hose filter layer is a filter, filter bag made of polyester flannel. Encountered minor damage, you can re-tightly laced with needle and thread to continue. Some of the suction hose with non-woven material of the filter layer, the breakage of the nonwoven fabric of the area available needle suture. Large areas of damaged you must replace it with a new filter layer to produce wide maintenance point. Paper filter bags small area of ​​damage, can use glue to dry then repair, a large area of ​​damage must be discarded and re-install the new filter bag.metric hydraulic fittings

I corrugated metric hydraulic hose fittings stress distribution

I corrugated hose diaphragm cone of the original surface. When the corrugated hose by the axial tensile force, j Division of the film stress in all points has a greater value (Fig. 57 a)), unlike I corrugated hose, just at the seams representing (Figure 56 a)). In force equilibrium conditions, the bending stress and film stress are nonlinear relationship between the radius of the diaphragm; At this time, the film stress pawl.hydraulic hose assembly
It should be noted that the for mutual welding corrugated hose, the film stress of the diaphragm at the seams 6. In contrast to the stress of 610 symbols with type I and I-type corrugated hose. Energy theory (Eq. 18) to determine the equivalent stress graph representation in Figure 566) and!), Figure 51-6) and!), Figure 586) and. ) On. Equivalent stress a. II. Distribution characteristics depend on the composition of welding corrugated hose diaphragm surface and load conditions. However, the general rule is close to the equivalent stress of the the corrugated hose inner and outer ring joints J. The maximum stress for the study of several welding corrugated hose, the two load conditions (p = 0; today 0, W 0 and p; = 0) are the seams of the inner ring. I and I-type corrugated hoses dangerous point is located in the inner surface of Type I corrugated hose in the case study, the dangerous point is located on the outer surface.
The internal pressure is generated under the free displacement type I, type I and I defended by the corrugated hose variety of programs after analysis showed that the dangerous point in the load quiet state is located in the outer seam of the corrugated hose Department. In general load case (ie bellows arrive pressure move a stroke stopper block and force to stop stopper), welding corrugated hose inner ring joints and outer joints must be calculated each stress points.
H / h = 10), the stress of the corrugated hose I 0: ratio of type I and II corrugated hose is much smaller (indicated with an asterisk in the pressure generated when the period of displacement under the action of the stress of the corrugated hose, in order to distinguish corrugated hose is deformed by the axial force generating). If the corrugated hose in the force balance conditions, 11 corrugated hose stress Stone, will be minimized.hydraulic hose and fittings

The obtained unknown corrugated Hydraulic hose assembly fatigue strength.

Here we studied the stress a: and a corrugated hose, identified by the different pressure and axial forces (or to a position shift) matches: Cycle parameters of the method. Stress cycle parameters should only be determined by the point of maximum stress of the corrugated hose, a the extremum sectional view of the corrugated hose on the A, B, C and D point is often this point (see Figure 35). For some corrugated hose, dangerous point may be somewhat deviate from the ring shells and the flat part of the connection (see Chapter II, Section 6). However, the standard sizes of the corrugated hose, plays a leading role in the stress state of the component (ie, a dynamic bending stress in the dangerous point and the A, B, C, D at the point even if they do not coincide, then nor away too much later in the calculation of the fatigue strength of the standard sizes of the corrugated hose, only with the stress values ​​of A, B, C and D point.socketless fitting
For each specific loading conditions, to determine the parameters of the above-mentioned various points of the corrugated hose in such a point of stress cycles, at this point due to the pressure becomes concentrated force (displacement) generated by the bending stress is a positive number. Stress cycles at these points is actually often the most dangerous. The unit stress can easily determine the principal stress cycle parameters. Size corrugated hose unit stress value (in absolute terms) can be calculated in accordance with the method described in section 3 in the computer and are listed in the Appendix. (The pressure is zero) or 1 kg of force / pressure attached Guang (zero displacement) role in the concentration of I mm displacement can cause stress in the the corrugated hoses study point is taken as the unit stress. For both loading conditions listed in the Appendix to call. And bow. - Having to film stress and film stress; bite N-by to the bending stress. Extremal cross section circumferential bending stress bow, represented by the formula (24) and meridional bending stress.
Given in Table 1, the symbols of all the stress components in the A, B, C and D point to change the loading direction will cause various changes in the stress component Symbol.hydraulic manifold block

Flange connection is an important connection to the pipeline construction

Flange connection of two pipes, fittings or equipment, the respective first fixed in a flange, the flange between the two, plus flange gasket fastened together with bolts, the connection has been completed. Fittings and equipment already comes with flange, also belongs to the flange connection.hydraulic testing machine
Flange screw connection (wire tapping) flanges and welded flanges. The low-voltage small diameter wire connected to the flange, the high and low pressure large diameter are welded flange, different pressures of the thickness of the flange and the connecting bolt diameter and the number of the type.
According to different levels of pressure, the flange gasket has a different material from the low-pressure gasket, high pressure gasket to the metal pad has.
Flange connection easy to use, able to withstand greater pressure.
The use of a wide range of industrial pipe, flange connection. Within the family, the pipe diameter is small, but it is low, invisible flange connection. In a boiler room or the production site, everywhere flange connection of pipes and equipment. Flange connection of two pipes, fittings or equipment, the respective first fixed in a flange, the flange between the two, plus flange gasket fastened together with bolts, the connection has been completed. Fittings and equipment already comes with flange, also belongs to the flange connection.
Note that the connection when the bolt to do all of the bolts tight.hydraulic block

Flanged What does it mean?

The flange is a link member that is used to connect the valve in the pipeline, the valve and the pipe connection when the connection is connected by a bolt, the two end faces of the valve with the N uniform bolt hole is flanged.
Flange: flange flange transliteration, means flanged things, parts, parts can be separate, that is, flange, or a combination, such as one or both ends of the tube with flange, the flange top with several through holes for mounting screws, some of the bearing outer ring with a flange, the flange can have holes, or may not be perforated, and only the positioning wall.hydraulic testing machine

2, flange type: valve in the pipeline or the connection of machinery and equipment used flange connection, known as the connection flange type.hydraulic block

Use of butterfly valves

The degree of opening of the butterfly valve and the relationship between the flow rate is substantially linearly proportional to the change. If you are used to control the flow
Its flow characteristics and pipe flow resistance is also closely related, such as the two pipe installation valve diameter, form full
Same, the pipeline loss coefficient valve flow difference will be large. If the throttle valve in the amplitude
The back of the larger state, the valve plate prone to cavitation, the possibility of damage to the valve, generally used in the 15 °
. ?
When the degree of opening of the butterfly valve is, the shape of the opening formed in the distal end of the valve body and the butterfly plate to the valve shaft as the center, on both sides of the shaped
Into a complete different side of the disc front Shun direction of running water moving to the other side of the water countercurrent direction,
Accordingly, the side than on the side of the valve body and the valve plate is formed similar to the nozzle-shaped opening, the other side is similar to the shaped opening of the orifice, nozzle
Throttle side flow speed, and the below the throttling side valve negative pressure will always be a rubber seal off
pneumatic fitting
Butterfly valve operation torque, the opening degree and the direction of valve opening and closing type, its value is different horizontal butterfly valve, especially large
Caliber valve, water depth, valve shaft, the torque generated by the water head difference can not be ignored. In addition, the valve into the
The mouth-side apparatus elbow formed when the bias torque will be increased. When the valve is in the intermediate degree of opening, due to the water flow
Torque is active, the operating mechanism is self-locking.

electric solenoid valve

Butterfly valve development process and the use of knowledge

The butterfly valve invented by the United States in the 1930s, China's promotion after 70 years. The butterfly valve has a good fitness
And reliability, widely used in the production and living, this article describes the butterfly valve the course of development, and use precautions
.
, Butterfly valve development:
In the 1930s, the United States invented the butterfly valve, was introduced into Japan in the 1950s and 1960s, is commonly used in Japan,
And promotion in China after 70 years. The world generally DN300 mm butterfly valve has been gradually
Instead of the gate valve. Compared to the butterfly valve and gate valve opening and closing time is short, small moments, small installation space and light weight
. Example, dn1000 about 2T butterfly valve, gate valve 3.5t, and the butterfly valve is easy with a variety of drive unit combination,
Good durability and reliability.

air cylinder manufacturers

Rubber sealing butterfly valve shortcomings throttle, cavitation due to improper use, peel the rubber seat
Fall, injury happens. To this end, the international development of metal sealing butterfly valve, cavitation zone is decreased in recent
Years, China has also developed a metal sealing butterfly valve in Japan in recent years has also developed resistance to cavitation, low vibration, low noise
Comb-shaped butterfly valve. Usually the life of the seal seat in the normal circumstances, the rubber 15, -20, 80 metal
-90 Years. But how correct selection depends on the conditions required.

pilot valves

Hydraulic valves and hydraulic support application analysis

Hydraulic support in coal mining machinery support equipment in the mine, after overhaul generally used for five years, but
3 months hydraulic support a variety of hydraulic valve life is very low, long, short, only a few weeks, foreign
Solve the ways and means to increase the filtration accuracy of the system and improve the quality of the emulsion, but with little success. With
A hydraulic valve in the UK for example, although the accuracy of the machining accuracy and the entire hydraulic system filter is higher, but
Low life in our country to be phased out.
Early hydraulic support, no other sealing measures between the motion pairs, direct contact with metal seal, that is,
Require sealing contact plane consistent with high machining accuracy, it must increase the binding force of the sealing
, So that the contact surface is plastically deformed to plug the leak channel. A complete hydraulic system consists of five parts group
Into, namely, power components, actuators, control components, no pieces and hydraulic oil. The role of the power element is the original
Motif of the mechanical energy is converted into fluid pressure in the hydraulic system pump, the entire hydraulic system mention
For power. Hydraulic pump structure generally in the form of gear pumps, vane pumps and piston pumps.
The role of the actuators (such as hydraulic cylinders and hydraulic motors) is the pressure of the liquid can be converted into mechanical energy to drive
Dynamic load for linear reciprocating or rotary motion.
Control and regulation of the liquid pressure in the hydraulic system, flow and direction control element (i.e., the various hydraulic valves)
. According to the different control functions, hydraulic valves can be divided into the village force control valves, flow control valves and directional control valves.

solenoid valve actuator

The pressure control valve is divided into benefits flow valve (safety valve), pressure reducing valves, sequence valves, pressure relay; flow control
System valves including throttle valve, regulating valve, flow diversion valve; directional control valve includes a one-way valve, check valve,
Shuttle valve, valve.
Depending on the control mode, the hydraulic valves can be divided into the switch control valve, fixed value control valve proportional control valve
.
Auxiliary components including the fuel tank, oil filter, tubing and fittings, seals, pressure gauge, oil level, oil temperature meter
And so on. Hydraulic oil is the working medium in the hydraulic system to transfer energy, there are a variety of mineral oil, emulsion molding Hop
Hydraulic oil categories.

3 way air valve

Buried design buried underground valve fully welded Body Ball Valve

Stem according to customer requirements to take a long, stem to take a long part of the design should be solid, resistant to ground bearing, all valve
Connecting pipe sealant injector, the bottom drain valve, safety relief device is connected to the surface to take over the valve body welding
Connection. The design of the extension rod, the major axis of the flexure and the gap of the coupling portion of the drive chain should be controlled to prevent over switch
Process, the sphere can not be accurate in the OFF or ON position, resulting in transmission errors.

mini solenoid valve

Pipeline ball valve scope of supply in accordance with API Standard 6D pipeline ball valve manufacturer equipment, the scope of supply of the product
Wai: of Class100 600 pounds level DN1 / 2 "-60" Class Class900 DN1 / 2 "-36" the Class1500
Pound class DN1 / 2 "-16" Class2500 globe pounds level DN1 / 2 "-12" for special occasions, foreign pipeline ball valve for
Stockist Class150-600 pound class caliber to DN72 "Class900 pound class maximum diameter to
DN40 maximum caliber of the "the Class1500 pound class to DN36" Class2500 globe pounds maximum diameter DN24 "

shut off solenoid valve

Ball Valve Maintenance Considerations

Ball valve has a longer service life and maintenance-free period, in addition to the normal operating conditions, harmony
The temperature / pressure ratio, and reasonable corrosion data will be dependent on factors that do the following Note:
● valve closed state, the internal body is still pressurized fluid.
● repair ball valve lift line pressure and the valve in the open position.
● ball valve maintenance, disconnect the power or gas source.
Repair, actuator and bracket from the
● must first identify the valve on the downstream pipeline, that has been dropped pressure to disassemble
● decomposition and re-assembly must be taken to prevent damage to the sealing surface of the parts, especially the non-metallic parts, take
The O-ring should use a special tool
● ball valve assembly bolts on the flange must be symmetrical, gradually and evenly tighten.
Cleaning agent should be used with ball valve, rubber parts, plastic parts, metal parts and the working medium (such as gas) are
Compatibility. The working medium is a gas, gasoline to clean metal parts. Non-metallic parts with pure water or alcohol
Clean
● break down the individual parts can be cleaned by immersion. Still left undecomposed down the the non-metallic parts
Metal parts can be clean famed for their silk cloth impregnated with a cleaning agent (in order to avoid fiber shedding adhesion on the part
) Scrub. Cleaning is required to remove all the adhesive on the wall of grease, dirt, rubber product, dust and other
Non-metallic parts should be cleaned immediately removed from the cleaning agent, not a long soak
● After washing need to be washed wall volatile cleaning agent (available not dip cleaning agent silk rub) assembly,
standard air cylinder
But shall not be shelved for a long time, otherwise it will rust, dust pollution
● new parts before assembly also need to be cleaned
● Use grease lubrication. Grease should be ball valve metal materials, rubber parts, plastic parts and the working medium
Are compatible. The working medium for the gas, can be used, for example, special 221 grease. On the surface of the seal mounting groove
Coated with a thin layer of grease, coated with a thin layer of grease on the rubber seals, valve stem sealing surface and the friction surface coating
A thin layer of grease
The assembly should be allowed to have metal debris, fibers, oils and fats (except for the requirement to use) dust and other miscellaneous
Quality, foreign body contamination, adhesion, or stay on the surface of the part or entering the chamber

direct acting solenoid valves

A locking ball valve packing at

Packing at the micro vent need to tighten the stem nut. Note: Do not lock tight, usually 1/4 turn lock to
1 lap, leaking stops.
2), the replacement of the valve seat and seals
A) Removal
The valve in a semi-open position, washed to remove the valve body inside and outside the hazardous substances that may be present.
Close the valve and disconnect the connection on both sides of the flange bolts and nuts, and then completely remove the valve from the pipeline
.
The order to remove the drive device - the implementing agencies, bracket, lock washer, stem nut, butterfly shrapnel,
Glam, wear-resistant film, stem packing.
Removing the body cover connecting bolts and nuts, valve cover and valve body separation, and remove the valve cover gasket.
Recognized ball valve in the "off" position, it can be easier taken out from the valve body, and then remove the seat
.
Nudge stem from the valve body in the hole down until it is completely removed, and then remove the O-ring and stem packing.
Note: Be careful to avoid scratch the stem surface and the valve stuffing box sealing parts.
B), reassembly
Cleaning and inspection remove the parts, it is strongly recommended spare parts package to replace the valve seat and valve cover gasket seal
Pieces.
direct acting solenoid valve
Assembled in the reverse order of removal.
With a predetermined torque, the cross-locking flange connecting bolts.
Specified torque, tighten the stem nut.
Implementing agencies is installed, enter the appropriate signal drive spool rotation by rotating the valve stem, the valve to fight
Open and closed positions.
If possible, before back to the installed pipeline, according to relevant standards valve pressure seal testing and performance testing

stainless steel pneumatic cylinders

The design and manufacture of pipeline ball valves

Ball Valve meet sulfide environment resistance to sulfide stress cracking requirements, from design, choice of
Materials, manufacturing, testing, surface treatment and painting in strict accordance with the American Association of Corrosion Engineers NACE standard
Requirements for the design. Ball Valve Series is not only a wide choice of materials and trim materials are used surface nickel-plated or
316, seal with a special polymer material. Alloy steel valves not only anti-corrosion, anti-curing ability
Strong, fireproof, anti-static, good sealing performance, apply pressure and wide temperature range, full bore and reduced bore available,
Can be equipped with a variety of drive devices, chemical, petroleum refining, natural gas extraction and delivery system ideal valve election
Optional.
Ball Valve For China, is part of the golden age of the world's population of 1/4, 2000
flange solenoid valve
Long-distance pipeline less than 20,000 kilometers, less than 1% of the global pipeline. After 2000, made rapid development, to
2009 has 80,000 kilometers of long-distance pipeline, accounting for 2.5% of the world's total, of which 31,000 km of gas pipeline
, 29,000 km of pipeline. Online service pipeline ball valve more than 2 million units. The design and manufacture of pipeline ball valves
Emphasized the safety and reliability of, in any case, not excessive. And this idea should be to carry out the ball valve
Product design, process specifications, spare parts processing, type testing, product testing, quality control, after-sales service
The entire process. Both long-distance pipeline or distribution network are energy supply lines, is one of the country's economic life
Pulse line. Global underground oil and gas pipeline and pipe network, as the ground transmission and distribution network, the city workers
Industry and civil basis for the survival, there is no energy supply lines, modern urban functions stop immediately.

pneumatic auto drain