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  2. Flow control valve - Wikipedia

    en.wikipedia.org/wiki/Flow_control_valve

    The most common final control element in the process control industries is the control valve. The control valve manipulates a flowing fluid, such as gas, steam, water, or chemical compounds, to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point. [ 1]

  3. Control valve - Wikipedia

    en.wikipedia.org/wiki/Control_valve

    Control valve. A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. [ 1] This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level. In automatic control terminology, a control ...

  4. Valve - Wikipedia

    en.wikipedia.org/wiki/Valve

    These water valves are operated by rotary handles. A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category.

  5. Railway air brake - Wikipedia

    en.wikipedia.org/wiki/Railway_air_brake

    A railway air brake is a railway brake power braking system with compressed air as the operating medium. [ 1] Modern trains rely upon a fail-safe air brake system that is based upon a design patented by George Westinghouse on April 13, 1869. [ 2] The Westinghouse Air Brake Company was subsequently organized to manufacture and sell Westinghouse ...

  6. Solenoid valve - Wikipedia

    en.wikipedia.org/wiki/Solenoid_valve

    A solenoid valve is an electromechanically operated valve . Solenoid valves differ in the characteristics of the electric current they use, the strength of the magnetic field they generate, the mechanism they use to regulate the fluid, and the type and characteristics of fluid they control. The mechanism varies from linear action, plunger-type ...

  7. Automatic bleeding valve - Wikipedia

    en.wikipedia.org/wiki/Automatic_bleeding_valve

    An automatic bleeding valve or air release valve (ARV) is a plumbing valve used to automatically release trapped air from a heating system . Air, or other gas, may collect within plumbing. For water delivery systems to taps and basins, particularly with good main supply pressure, this air is usually flushed through with the water flow and does ...

  8. Valve actuator - Wikipedia

    en.wikipedia.org/wiki/Valve_actuator

    Valve actuator. Electric actuator (blue cylinder) on a valve in a power plant. A black handwheel is visible on the actuator, which allows manual positioning of the valve. The blue valve body is visible in-line with the pipe. The valve actuator opens or closes the butterfly disc of the valve based on electrical signals sent to the actuator.

  9. Proportional control - Wikipedia

    en.wikipedia.org/wiki/Proportional_control

    Proportional control, in engineering and process control, is a type of linear feedback control system in which a correction is applied to the controlled variable, and the size of the correction is proportional to the difference between the desired value ( setpoint, SP) and the measured value ( process variable, PV).

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