Pressure Reducing Valve FAQs
Pressure Reducing Valve FAQs
What Is a Pressure Reducing Valve (PRV)?
A pressure reducing valve (or pressure reducer) is a valve fitted in a pipe system, which in spite of varying pressures on the inlet side (inlet pressure), makes sure that a certain pressure on the outlet side (outlet pressure) is not exceeded, thus protecting the components and equipment on the outlet side.
How Does a PRV Work?
A PRV opens and closes an aperture based on the set tension of a spring pushing on a diaphragm. The spring tension is set or adjusted via a plate this relates to a “bar” pressure setting point. Once in operation, the pressure of water pushing on the diaphragm is countered and adjusted by that of the spring.
Which Accessories are Available for PRVs?
Pressure gauges can be purchased separately or with the pressure reducing valve.
Can the Customer Set the Pressure By Themselves?
Yes, the outlet pressure can be adjusted within the spring range by means of standard tools.
Does Varying Inlet Pressure Have an Influence On the Outlet Pressure?
In the Case Of a Mechanically Operated PRV, Which Pressure is Controlled: That On the Inlet or That On the Outlet Side?
The pressure reducing valve controls the outlet pressure – the inlet pressure has no influence on the control of the pressure.
What’s the Difference Between a Static or Dynamic Pressure Control Valve?
A static control valve will limit the downstream pressure when there is no movement of water, whereas a dynamic valve control valve will only limit the pressure while there is movement of water.
Can PRVs be Installed Onto Hot & Cold Pipe Work?
The specification of the required pressure reducing valve should be checked for its eligibility prior to installation, however, many models are compatible with both supplies.
What Orientation Should the PRV be Installed?
Pressure reducing valves can be installed horizontally or vertically. If the valve is installed horizontally then the cartridge should be vertically mounted. Consideration should be made with regards to accessing the cartridge for future service/replacement.