Environmental awareness in the valve industry

The current environment, we already can not accept large-scale transformation, can not give what we want living space. How to protect and transform the environment has become the first choice for many people now.
Every time talking about the environment, we always feel that there is nothing, however, in the past when the 2013 winter, we deeply appreciate the environment has been transformed into what we extent. Because of this, energy saving has become now a lot of people want to pick problems. It is understood that ground source heat pump system can not only during the winter heating, summer cooling can also possesses features. More importantly, compared with coal, oil and gas and other traditional fossil energy, this system has a huge amount of renewable and does not pollute the environment of the three elements and clean, environmentally friendly, local access and other advantages.
With further development of ground source heat pump applications, ground-source heat pump system related technology products matures, more and more developers began to use the system to social life. Industry insiders estimate that geothermal energy development has entered the initial stage of rapid development. Geothermal resources means that in the current economic and technological conditions, the crust for geothermal energy development and utilization of geothermal fluid and useful part, is a clean energy source. Compared with coal, oil and gas and other traditional fossil fuels, with a huge amount of renewable and does not pollute the environment of the three elements and clean, environmentally friendly, local access and other advantages.
Ground source heat pump is a new use of shallow geothermal energy technology capable of heating and cooling, which works by using underground shallow geothermal resources. In winter, the shallow geothermal heat is transferred to the need for heating and warming the place, to the heating effect; in the summer, the heat is transferred to the low indoor heat source, to achieve cooling and refrigeration purposes. According to China's current development is concerned, is divided into ground source heat pump, ground source heat pump, ground source heat pumps, water source heat pump four categories. Ground source heat pump heating and air conditioning system is mainly divided into three parts: the outdoor heat exchanger geothermal energy systems, water source heat pump unit and indoor heating and air conditioning end systems. The main water source heat pump which has two forms: water - water type and water - air type. Between the three systems both by water or air heat transfer medium to transfer heat, the heat transfer medium between the water pump and the geothermal energy is water, and the air terminal building heating medium between the heat exchanger can be water or air.
In the cooling state, ground source heat pump compressor for refrigerant within the acting, it was vapor - liquid conversion cycle. By evaporation of the refrigerant in the evaporator by the fan coil loop carried by the heat absorption to the refrigerant, the refrigerant circulation while, and then the refrigerant is condensed by the condenser, the refrigerant from the water circuit will be carried by the heat absorbed by the water eventually circulation transferred to ground water, groundwater or soil. In the interior heat is transferred to the underground continuous process, through fan coil to form 13 ℃ or less cold air to the room cooling. In the heating state, the refrigerant compressor of acting, and the refrigerant flow direction through the Range Top Burner Valve commutation. Absorbed by water circulating underground surface water, groundwater or the soil heat by evaporation of refrigerant in the condenser, the water circulating through the refrigerant in the heat absorption, while the refrigerant circulating through the refrigerant condensed in the evaporator, by fan coil loop carried by the refrigerant heat absorption. Heat transfer to the interior of underground continuous process, in the form of more than 35 ℃ hot air to the indoor heating. In addition, ground-source heat pump system and no environmental pollution. Ground source heat pumps and air source heat emissions compared to equivalent reduced by more than 40 percent, compared with electric heating, representing a decrease of more than 70%, to truly achieve energy saving.

Radiator role in energy conservation

    Thermostatic radiator Gas Top Burner Valve are properly installed heating system, the user can request for room height, adjust and set temperature. This ensures that the room temperature constant, avoiding the water on the riser pipe system underlying imbalances and uneven temperature problem. Meanwhile, temperature control, freedom heat, the economy and so can only improve indoor thermal environment of comfort, but also to achieve energy savings.
Climate control - with climate change dynamically adjust output, constant temperature control, you can save energy. At the same time, eliminating temperature horizontal and vertical offset, the loop can be advantageous to reduce energy waste, while the adverse loops reaches flow and temperature requirements.
Freedom heat - the sun enters the body activities, cooking, heating appliances and other heat called freedom of heat, this part of the heat is no uncertainty in the design and operation to be fully considered, considered only as a safety factor. After the realization of temperature control, this energy can replace part of the heat loss, while the room temperature difference in different directions can be eliminated, not only improves the local thermal environment of comfort, but also saves energy.
Economic operation - office buildings, public buildings at night, rest days without full load heating. Residential users to try to make unmanned off heat, to save energy and heat costs. Can be implemented in different rooms at different temperatures control mode: When the officers to concentrate on the living room, the bedroom temperature can reduce the set, living room set temperature can be increased; sleep, rest time, the bedroom temperature can increase the set, living room set, and so the temperature can be reduced. These measures can be implemented radiator thermostats, energy-saving projects have been reached.
    Users control the indoor temperature is thermostatically controlled radiator valves to achieve. Radiator thermostatic control valve is a temperature controller, flow Gas Cooker valves and a pair of connectors, of which the core component is the thermostat sensor units, namely temperature package. Temperature sensor package can be generated by variations in ambient temperature volume changes to drive the control valve spool is displaced, thereby adjusting the amount of water to change the radiator heat sink capacity. Thermostatic valve set temperature can be artificially adjusted according to set requirements for thermostatic valve will automatically control and adjust the radiator water to reach the control room temperature mesh.

Thermostatic valve

Thermostatic valve is the main heating system flow regulation regulating device, a heating system does not set the temperature control valve can not call it that heat metering systems. Thermostatic valve structure and principles, analysis thermostatic valve flow characteristics, combined with the radiator flow characteristics, while the introduction of safety gas valve authority concept, elaborated radiator thermal characteristics, under thermostatic valve flow characteristics and valve authority work together to ensure that the radiator system adjust effectiveness; and describes the thermostatic valve installation program; and finally elaborated thermostatic valve role in energy conservation.
Users control the indoor temperature is thermostatically controlled radiator valves to achieve. Radiator thermostatic control valve is a temperature controller, flow control valve and a pair of connectors, of which the core component is the thermostat sensor units, namely temperature package. Temperature sensor package can be generated by variations in ambient temperature volume changes to drive the gas stove valve spool is displaced, thereby adjusting the amount of water to change the radiator heat sink capacity. Thermostatic valve set temperature can be artificially adjusted according to set requirements for thermostatic valve will automatically control and adjust the radiator water to reach the control room temperature mesh.
Under certain degree of opening thermostatic valve flow and full flow ratio of G / Gmax called relative flow; thermostatic valve opening degree under a full travel itinerary and the ratio l called relative stroke. And the relative flow between the relative stroke relationship is called thermostatic valve flow characteristics, namely: G / Gmax = f (l). They showed a linear relationship between the characteristics of quick opening characteristic, such as several characteristics percentage of properties, characteristics parabolic curve.
Radiator, the water conservancy stability and thermal stresses from the scheduling point of view, the amount of heat flow on the relationship between the performance of a bunch of throwing curve, increase traffic G, the heat quantity Q gradually become saturated. To make the system has good regulation characteristics, easy to adopt equal percentage flow characteristic radiator valve to compensate for their non-linear effects (1).

Regulating valve test methods

Regulating valve is very common in industrial production and particularly important control device, it is working properly or not directly related to the production of the entire device is normal or not. Now, with the regulating valve technology advances, manufacturers and regulating valve is very diverse forms, functions are different, the following highlights various types of valve prior to installation and commissioning should pay attention to common problems. Regulating valve incoming inspection is a very important part to confirm the arrival of the control thermostat valve meets the design requirements. The technical requirements of each valve shall meet the design requirements, but the incoming inspection should focus on checking the following items in the content.
1. Body / Trim Specifications

This should include: valve type, valve type, nominal diameter, seat size, spool form, flow characteristics, leakage levels, body material, spool material, Seat Material, CV values, flange standard grade sizes and sealing surface forms, etc., if they find the same content and design of which shall be designed to identify discrepancies and recognition.

2.2 Actuator section

This should be checked mainly actuator model, type, function form, spring range, gas pressure.

2.3 locator section

The content of this inspection locator input signals, air pressure, electric and gas source interface size and explosion-proof rating, including explosion-proof rating of not less than the design level requirements.


2.4 Accessories

Carefully clean the control Oven Gas Valve is designed according to the technical requirements of the various accessories, such as filter regulator, limit switches, solenoid valves, hand wheel, special tools. Examine the contents of the above can be achieved by cleaning, measuring instruments, see the nameplate and a dedicated detection methods (such as flanges and bolts material can be identified by spectral analysis) and other methods to achieve.

Adjustable mounting valve

Adjustable mounting valve

Adjustable mounting valve is the focus should be noted that the problem of installation quality directly related to the control valve into operation and performance. The installation process should pay attention to the following issues:

(1) Before installing the valve, the Propane Control Valve must be carefully remove the accumulated dust during storage, during the installation process should be kept clean. Because dust and impurities cause damage to the seat and inner parts. In order to protect clean, usually at the ends of the opening day is not welded flange is mounted on the cover.
(2) control valve installation, the arrow on the body should be consistent with the medium flow.
(3) control valve is precision components, if they are subjected to stress deformation pipeline would disrupt the normal work. Therefore, the vertical flange and pipe installation and the position should be accurate in order to avoid distortion of the pipe. Wells and pipelines to be properly supported to prevent it from happening in the weight of the valve bending.
(4) when the control valve and pipe welding must be especially careful. Note that if the valve and pipe welding was not able to eliminate stress, it will produce distortion. When soldering, welding slag must strictly avoid splashing into the valve, the presence of slag undermine the performance of thethermostatic valve, if splashing directly onto the spool, ranging from direct impact valve action, heavy damage to the valve and seat.
(5) when the pipeline pressure test and blowing, regulating valve should be removed, with the corresponding straight pipe connected to prevent welding slag, iron and other debris caught between the cutting valve and valve seat. Remove the valve opening flange ends of plastic sheeting wrapped securely application.

Regulating valve linkage test

After installing the control valve linkage test must be carried out before the device drive. Linkage test should focus on the following points:

(1) control valve linkage test must undergo a rigorous process piping before the purge and qualified, not qualified pipeline purge valve installation is prohibited because the residues within the pipeline such as welding slag, dust and other debris can damage the spool hard seat sealing surface.
(2) butterfly in front linkage should be checked at both ends of the valve with a pressure test or plugging should not blind plate.
(3) control valve with handwheel body, hand wheel mechanism should be in the "release" position. Check whether the air pressure of each valve regulating valve supply requirements.

Regulating valve site inspection

The main performance testing an on-site control valve

Regulating valve comprehensive performance indicators, including many, in addition to some items before installing just check verification, test certificate products, the proposal should focus on the following items for testing and calibration.

1) Basic error: the input signal is 20 ~ 10kPa to increase or decrease the balance of the input actuator chamber (or locator), the measurement points corresponding to the stroke value, calculated as follows: - Relationship "signal traveling" and Each point error between the theoretical value, which is the maximum basic error. Test point signal range should include at least 0,25%, 50%, 75%, 100% this five points should be limited to the basic error of measuring instruments were tested Range Top Burner Valve a quarter of the basic error limit.
2) Backlash: Test methods with one. The maximum difference between positive and negative travel on the same input signal is the secret was hysteresis.
3) Always point deviation: Test methods with one. Limit signal (starting point) is the basic error at the starting point of deviation; basic error limit (end) at the end of the signal is the deviation.
4) Leakage: more easily test medium for room temperature water test pressure test a trial by A as follows: When the valve pressure is less than 350kPa, test pressure according to 350kPa do, when the valve is working by allowing the pressure differential is greater than 350kPa do; and B test a trial according to the maximum working pressure valves do. A test in a trial, the gas pressure to open the valve actuator signal is zero; gas closed valve actuator signal pressure to the upper limit of the input signal; B test in a trial, the signal pressure from the actuator should the value of the design requirements. Test media should be required to flow into the valve, the gas Burner Valves outlet connection can be directly connected to the outlet through the atmosphere or atmospheric low pressure loss measuring device to confirm the valve and downstream of the connecting pipe is completely filled with the media before taking measured leakage.
5) The main valve, extreme pressure test should be done.
6) for supporting the valve locator, transportation, installation process, it is easy to move the positioner feedback touch panels and touch loose gas fittings. Therefore, before installation, commissioning, should be on-site commissioning.

2 valve-site installation points to note

Focus on the following issues when adjusting the valve is installed:

1) First, it is safe. Valve (ie installation, testing, operation and maintenance) in all aspects of the operation of safety, attention to personnel and equipment.
2) Maintenance and accessibility valve manually operated, so that in the future the instrument into a more convenient on-site operation and maintenance.
3) Press the flow direction of the installation (if installed backwards, the valve will start to oscillate or jump phenomenon).
4) straight pipe before the valve as far as possible longer.
5) If possible, use the outlet pipe 3 to 5 times the pipe diameter of straight pipe.

Regulating valve site maintenance

1.valve-site maintenance

Valve due to the direct contact with the process medium, and its performance directly affects the quality and environmental pollution systems, so the valve must be regular maintenance and periodic maintenance, especially the use of harsh conditions and important occasions should pay attention to maintenance work.

Check Range Valves to adjust the focus of the maintenance of the site are:

1) The body wall. For use in high differential pressure and corrosive media occasions valve, body wall, diaphragm often subjected to shock and corrosive media, should focus on checking pressure, corrosion-resistant case.
2) seat. Fixed seat is a threaded inner surface susceptible to corrosion leaving the seat move, should focus on checking this site. To work under high pressure differential valve should also check whether the seat sealing surface is erosion, cavitation.
3) spool. Erosion by the media, the corrosion of the most serious overhaul to carefully check whether the valve parts are corrosion, wear, especially in the case of high-pressure differential, the spool due to cavitation wear more serious.
4) Check the diaphragm, "O" rings and other seals are cracked damage or aging.
5) packing. It should be noted PTFE packing, sealing lubricant is aging, whether mating surface is damaged, replace if necessary.
6) Annex inspection and maintenance to ensure the normal operation of accessories and other heater valves.

2.valve failure and sleep-site treatment

Common problems regulating valve is closed die, open, large hysteresis, leakage, vibration, oscillation, etc., for their handling are as follows:

1) spool off dead: The gas valve closed solution is to increase the air pressure or loosen the spring preload (ie reduce membrane outdoor starting pressure). Open the valve on the gas solution is to increase the spring preload. While increasing pressure steam source.
2) slow action or no action putt: inspection of the diaphragm, rolling diaphragm, gasket is aging, rupture, causing leaks.
3) Great Backlash: putter bent, whether packing gland pressure tight, especially graphite packing, or whether the valve guide surface injury. The solution is to change the stem, for packing, increasing the gap between the guide, for a strong executive body.
4) full stroke valve is not enough: the stem connector nut release. The spin valve stem outward or inward stretch, so the whole trip deviation does not exceed the allowable value and then the nut and tighten.
5) Valve small opening poor stability: Live First check whether the flow is installed backwards, or valves election is too large, the solution according to the installation flow, reduce the spool size.
6) leakage volume: First check whether the sealing surface damage, seat number connecting thread is loose, the pressure valve is closed when the output power is greater than the actuator. The solution is to replace the sealing surface, and tighten the seat, replacing the high output power actuator.
7) Vibration sharply: the probability of the selected frequency and the frequency of the valve system is the same, the vibration will change drastically, this phenomenon was about 1% when the. The solution is to switch to a different structure of the valve.
8) Oscillation phenomenon: is due to the valve is small opening or closed due to the flow of the stream. The solution is to avoid the small opening, changing, open-type work.

Full-featured ultra-regulating valve and control valve comparative advantage

A total of nine regulating valve function, full-featured ultra-light valve nine features are excellent, so called full-function valve.

Good regulation

Regulatory function is one of the main functions of the control valve, the performance of ① flow characteristics; ② adjustable ratio R; ③ small opening performance; ④ flow coefficient; ⑤ adjust the speed. Full-featured ultra-light valve R = 100, so that the small opening adjustment is good; Kv value is large, is 2 to 3 times a single seat Safety Valve Burner Valve, the sleeve valve.

Cut-off function Good

Cut-off function to reflect the intrinsic quality of the valve. Linear actuator valve standard leak rate is usually 10 to 10; full-featured ultra-light valve standard leak rate of 10, compared with single-seat valves, valve sleeve 100 to 1000 times higher.

To overcome the large pressure difference

Overcome the pressure off function is to ensure the premise, and the cut-off function are inseparable. Seat valve allows pressure large, but a large leak; single seat valve leak is small, but allowing the pressure is small. Full-featured ultra-light gas safety burner valve a better solution pressure large, leak also requested a small problem, which allows the pressure up to PN value.

Corrosion strong function

Function ensures that the valve can resist corrosion corrosive media, erosion, cavitation and other damage and prolong life. Full-featured ultra-light valve using a corrosion-resistant material and erosion prevention measures, has good corrosion features.

Attempts to prevent the function is good

Attempts to prevent function well in order to effectively ensure that the valve is not clean medium occasions in normal operation. Follow the principles of fluid mechanics developed and designed a full-featured ultra-light valve, the flow path has a simple, less dead zone whirlpool, medium-through is not easy to settle, and good self-cleaning function, has become a high viscosity, suspension, pulp, concentrated slurry, containing The preferred medium is not clean product particles occasions applications.

High strength

Pressure function is to ensure the safety valve. Full-featured ultra-light valve body structure as a single piece integrated structure, improve the structural integrity of the pressure boundary, improved compressive strength. High pressure forged structure, to further improve the compressive strength of the body, the compressive strength of up to 32MPa or more.

Temperature function is good

Temperature function is to ensure the valve adapted to different temperatures. Full-featured ultra-light valve using rigid-flexible hard seal resolve core, seat package expansion card problems caused by high temperatures; using high temperature resistant filler Stove Top Burner Valve stem at a high temperature to ensure the reliability of the seal.

Good appearance and light weight

Appearance and weight function reflects the valve miniaturization, weight reduction, instrumentation features. Full-featured ultra-light valve with integrated body structure optimized design and appearance, and with a simple and reliable way directly connected to the actuator is connected, compact structure, small size, light weight, good appearance. Full-featured ultra-light valve with traditional leading products single-seat, two-seat, sleeve valve compared to its weight decreased by 60-80%, 40-60% lighter than the CV3000 and fine small valve. To DN100 electric valve, for example, the sleeve valve weighs about 150Kg, and full-featured ultra-light valve weighs only 40Kg (electronic), light 73%.

Check the status and development trend analysis

Check the evolution and innovation in the development of both a comprehensive breakthrough in the development of the calendar check the status review, the check valve is now standing in the peak of development, can be seen from the international market and domestic market demand the world has a lot of demand for non-return valve. Check the evolution and innovation in the development of both a comprehensive breakthrough in the development of the calendar check the status review, the check valve is now standing in the peak of development, can be seen from the international market and domestic market demand the world has a lot of demand for non-return gas safety burner valve.

At present, China's valve industry is still in the development stage, to be further improved in technology, variety, quantity and quality. According to statistics, the output value of industrial countries than the sum of the check valve compressors, fans and pumps, the whole machinery industry accounts for about 5 percent of GDP, while only half of the compressor, fan and pump check valve output value of China's accounting about 1% of the entire machinery of industrial output. This shows that our party and army and learn valve industry can not meet the needs of national economic development. Therefore, how to adjust the industrial structure and product mix valve industry development priorities for future work is to apply to all areas of the different requirements of the check valve.

Slow closing check valve silencer to enhance the quality, compared to the earlier non-return valve manufacturing process simple, rough, check the progress of modern enterprise technology, check product quality was a qualitative leap, use the range also will variable wide variety of functional check gas Burner Valves products increased,

Slow closing check valve control products silencer material, the emphasis is on modern society, low-carbon and environmental protection, check the product is the same, advances in technology, making the check valve products more lightweight.

Silent check valve development and the development of industrial enterprises has a close relationship, industrial enterprises development process, and ultimately, the use of check valves, in order to adapt to a variety of industrial enterprises development trend, check the manufacturers of products must be carried out reform and innovation, so as to keep up with the pace of development of industrial enterprises.

Slow closing check valve silencer evolution and innovation in the development of both a comprehensive breakthrough in the development of the calendar year status review of the check valve, the check valve is now standing on the peak of the positive development from the international market and domestic market demand can be seen all over the world have a lot of demand for non-return valve.

Any product has the characteristics of its development, the development of an integrated check valve can draw the following characteristics:

First, check the development of enterprises and industrial development has a close relationship, industrial enterprises development process, and ultimately, the use of check valves, in order to adapt to a variety of industrial enterprises development trend, check the manufacturers of products must be carried out reform and innovation , so as to keep up with the pace of development of industrial enterprises.

Second, improve the quality of the check valve, check valve manufacturing process compared to earlier crude, rough, check the progress of modern enterprise technology, check product quality was a qualitative leap, also will become a wide operating range various functions of the check valve products increased, for example: lift check valve, swing check valves, check valves and other multi-valve flue advent will change the world.

Third, the control valve product materials, modern society the emphasis is on low-carbon and environmental protection, check the product is the same, advances in technology, making the check valve products more lightweight, convenient, beautiful in product design time on the valve noise, materials, piping and other factors are very thorough, and better use of the modern industrial enterprise.

In short, China's development started late check on the international road, but with the rapid social development, check the speed of development in the modern world pole check companies can not match, the future of China-made products will check driven valve companies worldwide to create new ideas, only innovation can bring better development to the country.