Reason analysis and solution for unstable pressure output of pressure reducing valve

The pressure reducing valve is a valve that can regulate the pressure, reduce the inlet pressure to a certain required outlet pressure, and rely on the energy of the medium itself to keep the outlet pressure automatically stable. In the gas application system engineering, the pressure reducing valve is very common. The high-purity high-pressure gas in the gas cylinder is adjusted by the pressure reducing valve to meet the pressure requirements of the terminal.

From the point of view of fluid mechanics, the pressure reducing valve is a throttling element whose local resistance can be changed, that is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of decompression. Then rely on the adjustment of the control and regulation system to balance the fluctuation of the post-valve pressure with the spring force, so that the post-valve pressure remains constant within a certain error range.

In the actual working process, the output pressure of the pressure reducing valve is unstable, so what are the reasons and solutions for the unstable output pressure of the pressure reducing valve?

Fault analysis of unstable pressure fluctuation of pressure reducing valve:

1. There is internal leakage in the pressure reducing valve;

2. Blocked by impurities;

3. There is no secondary decompression system, and the pressure is unstable;

4. The diaphragm is damaged.

Solution:

1. Overhaul of pressure reducing valve;

2. Clean the impurities in the pressure reducing valve;

3. Design and install a two-stage decompression system to ensure stable pressure;

4. Replace the diaphragm.