Causes of Static Seal Leakage in Pressure Reducing Valves

Pressure relief valve is an important component in the hydraulic system. Its main function is to make the outlet pressure of the system always be lower than the inlet pressure, keep the system outlet pressure stable, and the system outlet pressure is not affected by fluctuations of the inlet pressure and flow. However, once the sealing valve leakage occurs in the pressure reducing valve, it will not only affect the normal production, but also cause the loss of hydraulic oil and pollute the environment. In the marine hydraulic system, the pressure reducing valve as the main control element, the importance of sealing is not to be underestimated. of.

1. Analysis of static seal failure problem of pressure reducing valve After analyzing and analyzing with relevant experts, it was found that the seal between the connecting sleeve and valve body of the pressure relief valve mainly depends on the O-ring between the connecting sleeve and the inner wall of the valve body. Sealed circumferentially, once the seal is effective, its external leakage is unavoidable.

2, to solve the pressure relief valve sealing measures (1) improve the pressure relief valve sealing surface quality.

(2) Ensure that the relief valve seal O-ring compression.

(3) Increase the pressure relief valve face seal.

(4) Reduce the friction between the O-ring of the pressure reducing valve and the sealing surface.