Pressure reducing valves
The task of pressure reducing valves is to reduce the system pressure to a predetermined level. A self-operated pressure reducing valve operates with the help of the medium. The target downstream side pressure is chosen as the valve pressure setting.
Self-operated pressure reducing valves are suitable for steam, liquids and gases. The valves can be dimensioned as required.
Two operating principles
Two different techniques can be applied for self-operated pressure reduction.
In the case of the first model, a membrane-operated disc is placed on the valve to which pressure is directed from the downstream side of the valve through an impulse pipe. In this case, the valve will operate as a function of the pressure from the impulse pipe and of the spring integrated in the valve. The spring force with a predetermined pressure setting attempts to open the valve, while the pressure coming from the membrane-operated device strives to close it. Such an operation is characteristic for the ARI and GESTRA pressure reducing valves.
In another, slightly simpler model, the valve opening is based only on the spring force integrated in the valve and on the internal structure, such as in case of NIEZGODKA pressure reducing valves.