Common water supply pipeline accidents pipe explosion

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In fact, in some ways, the main result in burst pipes and the the siltation gas pipeline. Pipeline gas rich in oxygen, attached to the

Pipe wall, the oxidation of iron pipe, genera ting rust off gradually, lead to wall thinning, can no longer afford the corresponding nominal pressure cited

The Exploder tube. This is a long-term oxidation. Due to the presence of airbags, fast switching jiaerling pneumatic or pump start and stop can lead to burst pipes, by

Change the switch pneumatic auto drain or pump start and stop the medium flow rate, the pipeline pressure value-added, the gas compressibility characteristics, stress

Centralized to a gasbag to produce high pressure and burst pipes. According to the case of burst pipes, air bag height to diameter of a quarter pipe explosion danger point

Critical point, that is, the airbag. Burst pipes in public water at the same time, also caused some social impact. This is also the water supply enterprises

Responsible for the headache.

Pipeline accidents water hammer

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Long-distance pressure water supply works in the pipeline, flow, Header Pipe speed generally higher trunk pipeline along the ups and downs over a long-distance water transfer
Projects often occur in various water column separation and cause Cavities Collapsing water hammer. The water column separation precisely because somewhere in the pipeline pressure dropped when

When the water temperature below the vapor pressure of liquid water vaporization. The gas will not be discharged in two water column re-bridge, due to jiaerling pneumatic

The violent collision between two jets of water will produce high pressure drying cavity with direct water hammer characteristics and then to bridge the water hammer. It might be more harmful

Caused by the pumping station flooded, and even monitor a large number of long-term leakage of the pipeline, flooding irrigation a large area of ??fertile farmland pneumatic auto drain

Piston solenoid valve failure and troubleshooting

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   A fault: power does not move Cause Analysis: The power supply wiring, poor contact; changes in supply voltage is not within the allowable range; for coil short-circuit

Or burn approach: The power cord; adjust the voltage within the normal range; replace the coil

      Failure two: open valve, fluid can not cause analysis: does not meet the fluid pressure or differential pressure; fluid viscosity or temperature

Complied with; the spool and the moving core around mixed with miscellaneous dirt, impurities; filter in front of the valve or pilot valve plug the hole; use when operating frequency is too high or life

Maturity approach: adjust the pressure or working pressure, or replace the product suitable; replacement of suitable products; cleaning of internal pneumatic auto drain before

Filter valve must be installed; timely cleaning the filter or jiaerling pneumatic  guide hole; reelection product model or replaced with new products

     Failure: Off valve fluid can not be cut off Analysis: the viscosit y of the fluid does not comply; fluid temperature does not comply; spring deformation or Shou

Life expired; seat defects or adhesion stolen goods; gasket prolapse `defects or deformation; balance hole or orifice clogged; the frequency of use

Too high or the end of life treatment methods: replacement of the right products; replacement of the right products; add pads or replace the spring; cleaning, grinding or

Update; update and re-assembly; timely cleaning; product model is re-election or change to a new product

      Failure: leakage Analysis: loose pipe joints; pipe connection seal damage approach: Tighten bolts or

Take over the thread; replace the seals

      Leak serious cause analysis: Fault 5: fluid temperature does not comply; guide seat and the main seat of impurities or defects; pilot valve and

Prolapse or distortion of the main valve gasket ; poor spring assembly, deformation, or end of life; use the operating frequency is too high: adjust the flow

Body temperature or replaced; cleaning or grinding, if you repair or replace; replace the gasket; replace the spring; reelection product model or replaced with new production

Products

      Failure: power noise Cause Analysis: loose fasteners; voltage fluctuations are not within the allowable range; fluid pressure or

Not suitable for working pressure; viscosity of the fluid does not comply; armature pull surface impurities approach: tighten; adjusted to within the normal range; adjust

Pressure or differential pressure of work or replace the product; replacement of suitable products; timely cleaning

Note selection of solenoid valves

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Selection of solenoid valve should first turn to follow the four principles of safety, reliability, applicability, economy, followed by the six areas

Site conditions (ie, the pipeline parameters, fluid parameters, pressure paramet ers, electrical parameters, action, special requirements to choose). Selected in accordance with

According to:

       Pipeline parameters to select electromagnetic valve: Path specification (ie, DN), the interface mode

      1, in accordance with the site pipe diameter size or flow requirements to determine the size of the diameter (DN).

      2, interfaces, general> DN50 To select the flange interface, ≤ DN50 can be free to choose according to user needs.

      Second, according to the fluid parameters to select electromagnetic valve: material, temperature group

      A corrosive fluid: better to use corrosion-resistant jiaerling pneumatic  and stainless steel; eating superclean Fluid: should use food grade s tainless steel

Solenoid valve.

      2, high-temperature fluids: To select a high-temperature electrical materials and sealing materials, electromagnetic valve, but also to select the piston Results

Structure type.

      3, fluid status: gaseous, liquid or mixed state, in particular, is a diameter greater than DN25 order must separate.

      4, the fluid viscosity: usually 50cSt the following arbitrary choice than this value will have to use the pneumatic auto drain of the high viscosity.

      Select solenoid valve: principles and structure of species based on the pressure parameters

      1, Pressure: This parameter is the same as the meaning of other general purpose valves, is based on the pipe nominal pressure to decide.

      Working pressure: if the low pressure must be selected direct action or step-by-step principle of direct action; minimum working pressure in 0.04Mpa

Above direct-acting type, step-by-step direct-acting, Pilot operated can be selected.

      Electrical options: voltage specification should be preferred AC220V, DC24 is more convenient.

      Five, according to the length of continuous working time options: normally closed, normally open, or sustainable power

       1, normally open when the solenoid valve open for a long time, and duration of the excess time off should be used.

       2, I opened a short time or on and off time is running out, then select normally closed type.

       3, but some conditions for security, s uch as furnace, furnace flame monitoring, you can not select normally open, you should choose a long-term power

Type.

       , According to environmental requirements, the choice of auxiliary functions: explosion-proof, non-return, manual, water fog, water washout, diving, explosive environment

: You must choose the appropriate explosion-proof level of the solenoid valve (my company existing: d II BT4, d II CT5, Ex m I / II T4).

       2, when the fluid inside back, you can choose my company OK71-N, OK72-N series with non-return function solenoid valve.

       3, when the scene manual operation of the solenoid valve, you can choose OK71-S, OK72-S series with manual functional electrical

Magnetic valve.

       4, open-air installation or dust more occasions should be used to waterpr oof, dust-proof varieties (protection class IP54 or more).

       5, for the fountain must be submersible type solenoid valve (protection class IP68 and above).

Solenoid valve material temperature group selected according to the fluid parameters

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      A corrosive fluid: better to use corrosion-resistant jiaerling pneumatic and stainless steel; eating superclean Fluid: should use food grade stainless steel

Solenoid valve.

      2, high-temperature fluids: To select a high-temperature electrical materials and sealing materials, electromagnetic valve, but also to select the piston Results

Structure type.

      3, fluid status: gaseous, liquid or mixed state, in particular, is a diameter greater than DN25 order must separate.

      4, the fluid viscosity: usually 50cSt the following arbitrary choice than this value will have to use the pneumatic auto drain of the high viscosity.

According to the environmental asked to select the auxiliary function

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Explosion-proof, non-return manually, water fog, water washout, diving, explosive environment: You must choose the appropriate explosion-proof level of the solenoid valve (my company

Existing: d II BT4, d II CT5, Ex m I / II T4)

       2, when the fluid inside bac k, you can choose my company OK71-N, OK72-N series with non-return function pneumatic auto drain.

       3, when the scene manual operation of the jiaerling pneumatic, you can choose OK71-S, OK72-S series with manual functional electrical

Magnetic valve.

       4, open-air installation or dust more occasions should be used to waterproof, dust-proof varieties (protection class IP54 or more).

       5, for the fountain must be submersible type solenoid valve (protection class IP68 and above).

Laser induced bubbles robot

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Recently, researchers from the University of Hawaii, their success will bubble into the control for the laser micro-robot ". The reason why the double quotes, because this bubble is not equipped with artificial intelligence, the principle is very simple. In the laborato ry, such a bubble in brine made of a 400-mW infrared laser control. Controller injection laser according to the inner surface of the bubble by the laser heating effect, the bubble surface of the liquid flow toward the colder side to the final result thus obtained is the bubble itself toward the laser refers to the move. It is reported that the current use of this controlled bubble is still very limited. Move other particles, which showed a high controllability and accuracy.

The researchers said that the implications of this study is that a very low cost, they will be able to create a massive bubble "robot". In theory, multiple bubbles can form a variety of more complex structures, corresponding to different needs. When this bubble Corps may be known as the real robot.