Pressure Reducing Valve for Wastewater

Pressure-reducing valves provide steady pressure into a part of the system which operates at a pressure lower than the normal system pressure. A reducing valve can normally be set for any desired downstream pressure within its design limits. Once the valve is set, the reduced pressure will be maintained regardless of changes in the supply pressure and system load variations. There are various designs and types of pressure-regulating valves. The spring-loaded reducer and the pilot-controlled valve are the most common.

The Pressure Reducing Valve senses the downstream pressure through a connection at the control valve outlet. Under flowing conditions, the pilot reacts to small changes in pressure to control the valve position by modulating the pressure above the diaphragm. The downstream pressure is maintained virtually steady at the pilot set-point. A pressure-reducing valve does not allow pressure downstream of the valve to exceed the set point. For instance, let’s suppose that the workpiece must be clamped with two clamps. The second clamp is placed at a point where too much clamping force will damage the workpiece. A pressure-reducing valve is used to limit clamping pressure. If the valve is set on 500 psi, if the pressure at the outlet of the valve increases above 500psi, the pressure-reducing valve partially closes to create an orifice. The pressure drop across this orifice reduces the downstream pressure to 500 psi.

A pressure-reducing valve maintains lower pressures in branches of hydraulic systems. The system relief valve or other pressure setting device determined upstream main system pressure. A pressure reducing valve is normally an open, 2-way valve that allows system pressure fluid to flow through it until a set pressure is reached downstream. It then shifts to throttle flow into the branch.