Operating principle of a pressure reducing valve

The principle of operation of a pressure reducing valve is to maintain a constant water pressure downstream at a set level. The valve has a gate, on one side of which water pressure is acting and trying to close it, while on the other side there is a force from the actuator (spring) trying to open the gate.

The necessary water pressure downstream of the valve is set by the force of the compressed spring. As long as the force of the spring on the gate is greater than the water pressure, the valve is open. Once the water pressure exceeds the force of the compressed spring, the gate will reduce the flow area by partially closing the valve and reducing the water pressure.

A pressure reducing valve maintains pressure with high tolerance, so if precision is required, a 'downstream pressure regulator' should be used instead. Remember, a pressure reducing valve cannot increase water pressure, it can only reduce it.

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