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  2. Proportioning valve - Wikipedia

    en.wikipedia.org/wiki/Proportioning_valve

    A cross-section of a proportioning safety valve. A proportioning valve is a valve that relies on the laws of fluid pressure to distribute input forces to one or more output lines. Proportioning valves are frequently used in cars and other road vehicles to reduce the brake fluid pressure to the rear brakes. Due to weight distribution during ...

  3. Hydraulic brake - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_brake

    The driver's brake pedal simply controls a valve to bleed pressure into the brake units at the wheels, rather than actually creating the pressure in a master cylinder by depressing a piston. This form of brake is analogous to an air brake system but with hydraulic fluid as the working medium rather than air. However, on an air brake air is ...

  4. Proportional control - Wikipedia

    en.wikipedia.org/wiki/Proportional_control

    The balls rise as speed increases, which closes the valve, reducing speed until a balance is achieved. 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 ...

  5. Railway air brake - Wikipedia

    en.wikipedia.org/wiki/Railway_air_brake

    The relay valve was equipped with four diaphragms, magnet valves, electric control equipment, and an axle-mounted speed sensor, so that at speeds over 60 mph (97 km/h) full braking force was applied, and reduced in steps at 60, 40 and 20 mph (97, 64 and 32 km/h), bringing the train to a gentle stop.

  6. Flow control valve - Wikipedia

    en.wikipedia.org/wiki/Flow_control_valve

    These types of valves are also known as automatic control valves. The hydraulic actuators respond to changes of pressure or flow and will open/close the valve. Automatic control valves do not require an external power source, meaning that the fluid pressure is enough to open and close them.

  7. 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.

  8. SSBC - Wikipedia

    en.wikipedia.org/wiki/SSBC

    SSBC may refer to: Sidney Sussex College Boat Club; South Sudan Broadcasting Corporation This page was last edited on 20 January 2020, at 05:58 (UTC). Text is ...

  9. Adjustable pressure-limiting valve - Wikipedia

    en.wikipedia.org/wiki/Adjustable_pressure...

    An adjustable pressure-limiting valve (commonly abbreviated to APL valve, and also referred to as an expiratory valve, relief valve or spill valve) is a type of flow control valve used in anaesthesiology as part of a breathing system. It allows excess fresh gas flow and exhaled gases to leave the system while preventing ambient air from entering.

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