What is a Pressure Reducing Valve?

What is a Pressure Reducing Valve?

Kimray’s Pressure Reducing Valve (or Regulator) creates and holds a downstream pressure set point. Additionally, the pilot and the valve are one piece, which designates it as an “integrated valve.”

You’ll often see the Pressure Reducing Valve used as a suction controller or recirculation valve on compressors, or to supply fuel gas.

How Does a Pressure Reducing Valve Work?

This valve monitors downstream pressure. Turn the bolt on top to adjust the set point. This will compress the spring.

The spring pushes down on the sensing diaphragm assembly. This positions the pilot plug. Next, the pilot plug allows gas from upstream to flow under the motor valve diaphragm. The pressure is controlled under this diaphragm, which positions the plunger to protect against changes in flowing conditions.

If the pressure exceeds the set point, the upstream pressure pushes up on the sensing diaphragm assembly. This closes the pilot plug. The underneath of the motor valve diaphragm vents gas which regulates the downstream pressure.

This sets a constant downstream pressure.

Because the diaphragm has a larger surface area than the plunger, the same pressure can hold the valve in a closed position.


If you have questions about the Pressure Reducing Valve or any other Kimray product, reach out to your local Kimray store or authorized distributor.


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Breck Swigart serves as Kimray’s Director of Product Support.