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A petcock is a small shut-off valve used to control the flow of liquid or gas.Historically, petcocks were threaded valves controlled by a butterfly handle; [citation needed] modern petcocks are typically ball valves.
Pilot valve: regulates flow or pressure to other valves; Petcock, a small shut-off valve; Pinch valve, "beach ball valve": simple, single-part two-port check valve made from soft plastic and molded onto inflatable units such as beach balls, air mattresses, water wings; can be inflated by pump or by mouth
In some aircraft, the shut-off function is a different valve located after the fuel selector valve. Typically, after the selector valve—situated at a low point in the fuel run—there is a gascolator — a fuel filter that can be opened on the ground and drained of fuel impurities denser than petroleum, mainly water and sediment. Other ...
Marcus C Inman Hunter: "Rotary Valve Engines", Hutchinson, 1946 (In Scribd) G F Hiett and J VB Robson: "A High-Power Two-Cycle Sleeve-Valve Engine for Aircraft", Aircraft Engineering and Aerospace Technology (1950), Vol 22, Iss 1, pp. 21–23, same authors, magazine and title, 2nd part, in Vol 22, Iss 2, pp. 32–45
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.
The large bipropellant valve normally required in such engines was replaced by a small pilot valve that used high pressure fuel to hydraulically actuate the moveable injector sleeve. This feature, called FSO (Face Shutoff Only) greatly improved overall thruster response and significantly reduced engine size and mass. [2]
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