What Does a Pressure Control Valve Do?
Pressure-control valves are found in virtually every hydraulic system, and they assist in a variety of functions, from keeping system pressures safely below a desired upper limit to maintaining a set pressure in part of a circuit. Types include relief, reducing, sequence, counterbalance, and unloading. All of these are normally closed valves, except for reducing valves, which are normally open. For most of these valves, a restriction is necessary to produce the required pressure control.
When used in tandem with a pump, a pressure control valve provides more accurate control over the pressure supplied by the pump. Generally, pressure control valves can be used in the following 2 ways, depending on the application:
1) Pressure Control
A pressure control valve can be used to maintain constant pressure, after the pump, for exact flow rates under a variety of conditions. For instance: unrestricted flow, with varying positive or negative pressure on the inlet side, or varying downstream pressure.
2) Bypass Valve
A pressure control valve can serve as a safety device for protection of a system’s pump, motor, tubing and connections, vessels and other accessories. Installed as a bypass valve, it prevents excessive pressure build up in the system caused by dirt, misuse or other problems.
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