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  2. 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.

  3. Safety valve theory - Wikipedia

    en.wikipedia.org/wiki/Safety_valve_theory

    The safety valve theory was an American theory of economic development that held the availability of free land and continued expansion westwards into the American frontier contributed to American development, explained the lack of labor movements in the United States, and promoted democracy, economic equality and individualism. [1]

  4. 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.

  5. Downhole safety valve - Wikipedia

    en.wikipedia.org/wiki/Downhole_safety_valve

    The location of the downhole safety valve within the completion is a precisely determined parameter intended to optimise safety. There are arguments against it either being too high or too low in the well and so the final depth is a compromise of all factors.

  6. Shutdown valve - Wikipedia

    en.wikipedia.org/wiki/Shutdown_valve

    A shutdown valve (also referred to as SDV or emergency shutdown valve, ESV, ESD, or ESDV; or safety shutoff valve) is an actuated valve designed to stop the flow of a hazardous fluid upon the detection of a dangerous event. This provides protection against possible harm to people, equipment or the environment.

  7. Safety-valve institution - Wikipedia

    en.wikipedia.org/wiki/Safety-valve_institution

    Safety-valve organization or safety-valve institution is a term used in sociology to describe social organizations which serve to allow discontented individuals to act out their opposition to elements of society without coming into direct contact with the elements, analogically "letting off steam". [1]

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