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  2. Pilot-operated relief valve - Wikipedia

    en.wikipedia.org/wiki/Pilot-operated_relief_valve

    A separate actuator on the piping releases pressure in the line if it crosses a threshold. This releases the pressure on the back of the seal, causing the valve to open. The essential parts of a PORV are a pilot valve (or control pilot), a main valve, a pilot tube, the dome, a disc or piston, and a seat. The volume above the piston is called ...

  3. Steam locomotive components - Wikipedia

    en.wikipedia.org/wiki/Steam_locomotive_components

    The valve gear, actuated by connection to the driving wheels, ensures that steam is delivered to the piston with precision. Types are slide valves, piston valves or poppet valves. [2] [3]: 62 Valve chest / Steam chest Valve chamber next to the cylinder (24) containing passageways to distribute steam to the cylinders. [6]: 41 [3]: 75 Firebox

  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. Rocketdyne F-1 - Wikipedia

    en.wikipedia.org/wiki/Rocketdyne_F-1

    Recovered F-1 engine parts on display at the Museum of Flight in Seattle. Recovered F-1 engine injector from Apollo 12 mission on display at the Museum of Flight in Seattle. On March 28, 2012, a team funded by Jeff Bezos, founder of Amazon.com, reported that they had located the F-1 rocket engines from an Apollo mission using sonar equipment. [25]

  6. Dyle et Bacalan DB-20 - Wikipedia

    en.wikipedia.org/wiki/Dyle_et_Bacalan_DB-20

    The DB-20 was an all-metal monoplane with a mixture of steel and duralumin tube frames and duralumin skin. Designed as a ground attack aircraft, it was heavily armoured. An earlier Dyle and Bacalan twin engine design, the DB-10 had a very deep airfoil centre section between the engines which replaced the forward fuselage.

  7. Pressure regulator - Wikipedia

    en.wikipedia.org/wiki/Pressure_regulator

    All modern pressure cookers will have a pressure regulator valve and a pressure relief valve as a safety mechanism to prevent explosion in the event that the pressure regulator valve fails to adequately release pressure. Some older models lack a safety release valve [citation needed]. Most home cooking models are built to maintain a low and ...

  8. Ascent propulsion system - Wikipedia

    en.wikipedia.org/wiki/Ascent_Propulsion_System

    The ascent propulsion system (APS) or lunar module ascent engine (LMAE) is a fixed-thrust hypergolic rocket engine developed by Bell Aerosystems for use in the Apollo Lunar Module ascent stage. It used Aerozine 50 fuel, and N

  9. Pogo oscillation - Wikipedia

    en.wikipedia.org/wiki/Pogo_oscillation

    Pogo oscillation is a self-excited vibration in liquid-propellant rocket engines caused by combustion instability. [1] The unstable combustion results in variations of engine thrust, causing variations of acceleration on the vehicle's flexible structure, which in turn cause variations in propellant pressure and flow rate, closing the self-excitation cycle.

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