Pneumatic knowledge sharing - The Pressure Reducing valve

[Reducing valve] adjusts and reduces the higher inlet pressure to the outlet pressure (pressure regulation) that meets the requirements of use. And to ensure the stability (stabilization) of the outlet air pressure after adjustment.

 Knowing the definition of a pressure reducing valve, we might as well take a look at its working principle:


Principle description of diaphragm pressure reducing valve:

1. Pull the handwheel out, and when you see the orange ribbon, turn the handwheel clockwise.

2. The adjusting spring is compressed, pushing the diaphragm down, and opening the spool through the valve stem, the inlet air pressure is adjusted and reduced by the spool, and there is pressure output.

3. The outlet pressure gas enters the lower cavity of the diaphragm through the feedback path and generates an upward thrust on the diaphragm.

4. When the pressure at the lower part of the diaphragm and the spring force at the upper part are the same (when the thrust force is balanced with the pressure regulating spring force), the outlet will get a stable air pressure.

So what is the difference between a relief valve and a non-relief valve?

We use the following picture to briefly explain the working principle of the overflow safety valve:


Simply put, that is: after the air pressure is greater than the set pressure, the overflow valve will automatically open the exhaust to reduce the pressure