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  2. Scuba cylinder valve - Wikipedia

    en.wikipedia.org/wiki/Scuba_cylinder_valve

    A scuba cylinder valve or pillar valve is a high pressure manually operated screw-down shut off valve fitted to the neck of a scuba cylinder to control breathing gas flow to and from the pressure vessel and to provide a connection with the scuba regulator or filling whip. [1]

  3. Zone valve - Wikipedia

    en.wikipedia.org/wiki/Zone_valve

    In this way, applying power to the "open valve" terminal causes the motor to run until the valve is open while applying power at the "close valve" terminal causes the motor to run until the valve is closed. The motor is commonly powered from the same 24 volt ac power source that is used for the rest of the control system.

  4. Festo Dugange - Wikipedia

    en.wikipedia.org/wiki/Festo_Dugange

    Festo Dugange, also known as Festo John Dugange, is a Tanzanian politician. He serves as Deputy Minister, President's office public service management and good governance. He is the Chama Cha Mapinduzi member of parliament for Wanging'ombe constituency to which he was elected in 2020. [1] [2] [3]

  5. 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

  6. History of the transistor - Wikipedia

    en.wikipedia.org/wiki/History_of_the_transistor

    A transistor is a semiconductor device with at least three terminals for connection to an electric circuit. In the common case, the third terminal controls the flow of current between the other two terminals. This can be used for amplification, as in the case of a radio receiver, or for rapid switching, as in the case of digital circuits.