A backpressure control valve is a type of relief valve to obtain a constant level of pressure in the first stage of valve operation. This type of valve makes it easier and speedier for the user to control pressure in the tank with a large buffer, purge a given quantity of mixed gas or to carry out such other operations which are rather hard to do with a second-stage control valve commonly in use. It is also suitable for tank pressure control and control of constant flows of mixed gases applications.

Backpressure regulating valves are self-operated steam pressure regulator, which is mounted in the steam outlet line from the steam generator. The valve taps its actuating energy directly from the steam itself and ensures that a minimum upstream pressure is maintained. If the upstream pressure falls below the set point the valve will starts to close until the minimum desired pressure is achieved.

Back Pressure Regulator is used to control the upstream of pressure in a fuel cell test system, while allowing gases to flow through a diaphragm. The diaphragm operates like a sensitive adjustable relief valve. Back pressure regulators work up to a 200° C environment with a control pressure of 0 to 50psig and have a flow capacity of 0.3Cu. Back pressure regulators are used to prevent over pressurization of storage vessels, compressors and pumping systems.

Back Pressure Regulators sense and control evaporator pressure. The primary function of this valve is to prevent evaporator pressure from falling below a predetermined value. The valve opens when the evaporator is operating at design pressure. As the load is met and evaporator pressure drops, the valve automatically throttles or restricts vapor leaving the evaporator, thus maintaining the desired minimum evaporator pressure. When the load increases, the evaporator pressure rises above the valve setting and the valve opens further. It prevents freezing of water chillers that operate at excessively low suction temperatures. On a multi-temperature evaporator system, the backpressure-regulating valve is installed on the suction line of the higher-temperature evaporator.