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When reducing the pressure and regulating the pressure of water, gas and steam, many users are worried that the pressure after the selected reducing valve changes due to the instability of pressure and flow in front of the valve and the change of flow, and the pressure cannot be reduced normally. Based on professional knowledge and experience, Weidun VTON analyzes the selection of imported self-operated pressure reducing valves and the use feedback of imported pressure reducing valves, especially the use feedback of imported self-operated pressure regulating valves, to see which imported self-operated pressure regulating valves can be used.
If the pressure behind the valve is to be stable, it is the self-operated pressure control valve at the inlet behind the valve. The pressure change at the front end of the pressure reducing valve will not affect the back end pressure, so it can be called the back pressure control valve.
I. Overview of pressure regulating valve after imported self-operated valve
VTON, Wilton, USA
After-valve self-regulating valve is an imported self-regulating valve, also known as after-valve valve. It takes the self-energy of the regulated medium as the power source, introduces the position of the actuator control valve core, changes the pressure difference and flow at both ends, and stabilizes the after-valve at the required valve pressure. Witton VTON self-operated pressure regulating valve in the United States has the advantages of sensitive action, good sealing performance and small wave force at the pressure set point behind the valve, which is widely used in automatic control of pressure reduction and stabilization of gas, liquid and steam media.
The self-operated pressure regulating valves of Witton VTON in the United States mainly include control valve back pressure type and control valve front pressure type. The materials are stainless steel and cast steel.
Two. Parameters of pressure regulating valve after imported self-operated valve
1. The pressure regulating valve behind the imported self-operated valve does not need additional energy, and can work in a place without electricity and gas, which is convenient and energy-saving.
2. The pressure sections behind the imported self-operated valve pressure regulating valve are narrow and cross each other, with high adjustment accuracy.
3. The post-valve pressure setting value of the imported self-operated pressure regulating valve can be set continuously during operation.
4. The imported self-operated back pressure regulating valve regulates the back pressure, and the ratio of the back pressure before the valve to the back pressure after the valve can be 10: 1 ~ 10: 8.
5. After the imported self-operated valve is used to detect the rubber diaphragm of the pressure regulating valve, the measuring accuracy of the actuator is high and the action is sensitive.
6. The pressure regulating valve behind the imported self-operated valve adopts the pressure balance mechanism behind the valve, which makes the regulating valve sensitive and accurate in control.
III. Materials of main parts of pressure regulating valve after imported self-operated regulating valve
Valve body: WCB, CF8. CF8M
Spool: 1Cr 18Ni9Ti? 、Cr 18Ni 12Mo2Ti
Seats: 1Cr 18Ni9Ti? 、Cr 18Ni 12Mo2Ti
Stem: 1Cr 18Ni9Ti？ 、Cr 18Ni 12Mo2Ti
Membrane cover: A3 and A3 steel coated with tetrafluoroethylene? stainless steel
Filler: nitrile, ethylene glycol, fluorine, oil-resistant rubber.