Gas pressure reducing valve
Pressure reducing valve (reducing valve) is a control valve in the body of the opening of the opening and closing of regulating the flow of medium, the medium pressure is reduced, at the same time with the aid of the role of the valve after pressure adjust the opening of open-close part, keep the valve after pressure within a certain range, and the valve body or valve after the injection of cooling water, reduce the temperature of medium, the valve is called desuperheating valve to relieve stress.The characteristics of the valve, is under the condition of the inlet pressure changing, keep exports to the pressure and temperature in a certain range.Relief valve pneumatic control valve is a necessary accessories, main effect is to air pressure decompression and stability to a fixed value, so that the regulator can obtain stable gas source power for regulating control.This valve shall generally be installed in the pipeline.
1) Function: Control the valve pressure
2) Guarantee time: 1 year
3) Top quality and reasonable price
4) Certificate: ISO9001, CE
1) Sizes: DN50-600
2) Pressure class: PN10-25
3) Suitable temperature: 0 ~ 80Deg. C
4) Suitable medium: Water, sewage
5) Body material: WCB, CI
6) Connection: FF, RF
Pressure reducing valve
1. The pilot operated relief valve
When the output of the pressure reducing valve, pressure higher or larger regulating directly with pressure regulating spring, the spring stiffness is too large, flow changes, the output pressure fluctuation is bigger, the structure size of the valve will also increase.In order to overcome these shortcomings, can be usedPilot operated relief valve.Pilot operated relief valve working principle and straight acting basically the same.Pilot operated relief valve used in gas, voltage regulator is made up of small supply of straight moving type relief valve.If the small straight moving type relief valve is installed inside the body, is called the internal pilot operated relief valve;If the small straight moving type relief valve is installed on the outside of the main body, is called external pilot operated pressure reducing valve.Internal pilot operated relief valve compared with straight moving type relief valve, the valve is increased by the nozzle 9 and 4, 3, fixed damper orifice gas chamber of the nozzle flapper amplification B.When the distance between the nozzle and the baffle is small change, can cause stress in the room B obvious changes, causing 10 have larger displacement of diaphragm, and 6 to control valve core to move up and down, the intake valve opening up or down, improves the sensitivity of control valve core, which improved the precision of voltage regulation.
The working principle of external pilot operated relief valve is the same as the straight acting.On the outside of the main body and a small straight moving type relief valve (at the end of the diagram shows), controlled by it to the main valve.This kind of valve is suitable for sizing in more than 20 mm, (within 30 m) over a long distance, high, danger, difficulty regulating occasions.
2. Straight moving type relief valve pressure reducing valve
Pressure of compressed air for P1, from left side input after 10 throttling valve, pressure drop for P2 output.The size of the P2 can be adjusted by a pressure regulating spring 2, 3.The knob clockwise 1, compression spring, 2, 3, 8 down and diaphragm may make the valve core, valve mouth opening of 10 P2 increase.1 if counterclockwise rotation knob, opening of valve port 10 is reduced, the P2 is less.
Transient rise if P1, P2 will then increases, the diaphragm chamber pressure within 6, on the diaphragm may produce thrust increases accordingly, the thrust destroy the balance of the original force, make the diaphragm move up 5, there are a few flows through the overflow hole 12, 11 exhaust vent.In the diaphragm up at the same time, because of the role of the reset spring 9, 8 also makes the valve core moving up and down inlet valve mouth 10, throttling effect, make the output pressure drop, until reaching a new equilibrium, output pressure basic back to the original value.If the instantaneous input pressure drop, the output pressure decline, diaphragm down 5, 8 with the valve core down, intake valve opening 10 up, throttling effect is reduced, the output pressure is basically back to its original value.The knob counterclockwise to 1.Relax the regulating spring 2, 3, gas effect on the diaphragm 5 thrust is greater than the pressure regulating spring force, diaphragm upward curve, by the reset spring will close the inlet valve function of 10.Rotate knob 1 again, the top of the inlet valve core 8 4 will release with the overflow valve seat, diaphragm chamber via the overflow hole 12, six of compressed air vent discharge, the valve is in a state without output.
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1, the pressure reducing valve should be stored in dry room and must be used on both ends of the channel congestion, are not allowed to be stacked tailings storage.
2, long-term storage of pressure reducing valve should be checked regularly, clean the dirt, the movement parts and machining surface should be coated with anti-rust agent, prevent rust.
Failure to eliminate
|The fault phenomenon||The reasons causing||Elimination method|
|Pressure reducing valve is not reducing or reducing failures and direct||1 the main valve or pay the valve sealing surface with dirt||1. Clear the dirt|
|2 the main valve or pay for the damage of valve sealing surface||2. Seal lapping repair or replacement|
|3, pay disc spring fatigue or broken||3. Replace the new spring|
|4 feedback channel 3 holes are blocked||4. Clear away the dirt in the channel|
|5 diaphragm fatigue or damage||5. Replace the diaphragm|
|6 the piston cylinder wear or corrosion||6. Processing correction or replacement of piston ring|
|7 ring grooves with ring sticking||7. Remove the piston to clean|
|8 the body cavity full of condensate||8. Loosen the screw discharge condensate|
|No steam||1 in the process of cleaning the cover dislocation||1. Remove the cover position after installed|
|2 gaskets shift plug in and out of the hole||2. Make the gasket hole alignment in and out of the hole|
|3 access to pay valve hole plug||3. Remove the cover to clear channel dirt|