Pilot Operated Downstream Pressure Regulating Valves Working Principle


Downstream Pressure regulating valves are self contained, Self Operated control devices, which use energy from the controlled system to operate and regulate pressures. Valve Solutions manufactures a variety of pressure reducing regulators to manage downstream system pressures in low, medium, high flow applications, model features a diaphragm type, piston type or combination of both to suit different applications.

A pressure reducing regulator maintains a desired reduced outlet pressure while providing the required fluid flow to satisfy a variable downstream demand. The valve at which the reduced pressure is maintained is the outlet pressure setting of the regulator.

Pilot Operated Downstream Pressure Regulating Valves Working Principle

A pilot operated system uses a two-path control. In two path control, the main valve diaphragm responds quickly to downstream pressure changes, causing an immediate correction in the main valve position. At the same time, the pilot diaphragm diverts some of the reduced inlet pressure to the other side of the valve diaphragm, control the final positioning of the main valve plug.

Two-path control result in fast response. Pilot-operated regulators are preferred for broad-range control, or where the allowable change in outlet pressure is required to be less than 10 percent of the outlet pressure setting. They are also commonly used when remote set point adjustment is required for a regulator application.

Reference : Valve Solutions