A pressure reducing valve, often referred to as a pressure regulator, is an apparatus that controls the flow of a liquid or gas and automatically discontinues the flow once a certain pressure level is attained. Pressure reducing valves are used on an assortment of devices within several different industries. They are utilized for purposes of water pressure reduction, the proper functioning of propane and liquid petroleum (LP) gas tanks, the effective performance of SCUBA divers' air tanks, and the optimal operation of certain recreational vehicles. They are also used in the gas, oil, and mining industries.

Pressure REDUCING VALVES can typically be set for any required downstream pressure level that fits within the parameters of the valve's construction. According to the Uniform Plumbing Code, a plumbing pressure reducing valve is mandatory on all plumbing systems that surpass 80 psi (5.62 kg/cm).

For water pressure cutback and conservation, a water pressure reducing valve is often implemented. They can be installed in homes, businesses, and industrial buildings in order to lower water pressure and lessen the flow of unneeded amounts of water. The pressure reducer valve works automatically, regulating the flow of pressure from a structure's main water supply. This valve is an economical and environmentally responsible way to lower water and energy usage and cost.