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  2. Relief valve - Wikipedia

    en.wikipedia.org/wiki/Relief_valve

    A relief valve DN25 on cooling water pipe from heat exchanger Schematic diagram of a conventional spring-loaded pressure relief valve. A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; excessive pressure might otherwise build up and create a process upset, instrument or equipment failure, explosion, or fire.

  3. Pilot-operated relief valve - Wikipedia

    en.wikipedia.org/wiki/Pilot-operated_relief_valve

    At set pressure the valve snaps to full lift. This can be quite violent on large pipes with significant pressure. The pressure has to drop below the set pressure in order for the piston to reseat (see blowdown in relief valve article). Modulating The pilot is designed to open gradually, so that less of the system fluid is lost during each ...

  4. Surge control - Wikipedia

    en.wikipedia.org/wiki/Surge_control

    Gas-loaded relief valves are controlled by the nitrogen pressure loaded into the relief valve. If there is no control on the nitrogen pressure, then the nitrogen gas will expand and contract with the changing ambient temperature. As the nitrogen pressure drifts with the temperature so does the set point of the relief valve.

  5. Safety valve - Wikipedia

    en.wikipedia.org/wiki/Safety_valve

    An oxygen safety relief valve DN250-safety valves. A safety valve is a valve that acts as a fail-safe.An example of safety valve is a pressure relief valve (PRV), which automatically releases a substance from a boiler, pressure vessel, or other system, when the pressure or temperature exceeds preset limits.

  6. Thermal expansion valve - Wikipedia

    en.wikipedia.org/wiki/Thermal_expansion_valve

    The refrigerant is compressed by the compressor to a high-pressure and high-temperature gaseous state. The high-pressure and high-temperature gas then enters the condenser. The condenser cools the high-pressure and high-temperature gas allowing it to condense to a high-pressure liquid by transferring heat to a lower temperature medium, usually ...

  7. Radiator (engine cooling) - Wikipedia

    en.wikipedia.org/wiki/Radiator_(engine_cooling)

    A calibrated pressure-relief valve is usually incorporated in the radiator's fill cap. This pressure varies between models, but typically ranges from 4 to 30 psi (30 to 200 kPa). [4] As the coolant system pressure increases with a rise in temperature, it will reach the point where the pressure relief valve allows excess pressure to escape.

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