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  2. Sleeve valve - Wikipedia

    en.wikipedia.org/wiki/Sleeve_valve

    Sleeve valve closeup from a Bristol Centaurus Mark 175. Bristol Perseus. The sleeve valve is a type of valve mechanism for piston engines, distinct from the usual poppet valve. Sleeve valve engines saw use in a number of pre–World War II luxury cars and in the United States in the Willys-Knight car and light truck. They subsequently fell from ...

  3. Poppet valve - Wikipedia

    en.wikipedia.org/wiki/Poppet_valve

    The valve stem D moves up to open the valve discs C. James Watt was using poppet valves to control the flow of steam into the cylinders of his beam engines in the 1770s. A sectional illustration of Watt's beam engine of 1774 using the device is found in Thurston 1878:98, [ 13 ] and Lardner (1840) provides an illustrated description of Watt's ...

  4. Valve guide - Wikipedia

    en.wikipedia.org/wiki/Valve_guide

    Valve guides are cylindrical metal bushes, pressed or integrally cast into the cylinder head of most types of reciprocating engines, to support the inlet valve and exhaust valve stems. [1] So that they may make proper contact with its valve seat. Along with a corresponding valve spring, they are one component of an engine’s valve train.

  5. List of valves - Wikipedia

    en.wikipedia.org/wiki/List_of_valves

    Poppet valve and sleeve valve: commonly used in piston engines to regulate the fuel mixture intake and exhaust; Pressure regulator or pressure reducing valve (PRV): reduces pressure to a preset level downstream of the valve; Pressure sustaining valve, or back-pressure regulator: maintains pressure at a preset level upstream of the valve

  6. Schrader valve - Wikipedia

    en.wikipedia.org/wiki/Schrader_valve

    The Schrader valve consists of a valve stem into which a valve core is threaded. The valve core is a poppet valve assisted by a spring. A small rubber seal located on the core keeps the fluid from escaping through the threads. Using the appropriate tools, a faulty valve core can be immediately extracted from the valve stem and replaced with a ...

  7. Bristol Hercules - Wikipedia

    en.wikipedia.org/wiki/Bristol_Hercules

    The Bristol Hercules is a 14-cylinder two-row radial aircraft engine designed by Sir Roy Fedden and produced by the Bristol Engine Company starting in 1939. It was the most numerous of their single sleeve valve (Burt-McCollum, or Argyll, type) designs, powering many aircraft in the mid-World War II timeframe.