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  2. Automatic balancing valve - Wikipedia

    en.wikipedia.org/wiki/Automatic_balancing_valve

    These valves offer much lower pressure requirements as a pressure regulator requires a pressure within a range to achieve operation. They increase flexibility as there settable flow range is often significantly larger than their mechanical counterparts, they also offer improved dirt tolerance thanks to a simplified water path and some the ...

  3. Reduced pressure zone device - Wikipedia

    en.wikipedia.org/wiki/Reduced_pressure_zone_device

    A reduced pressure zone device (RPZD, RPZ, or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination. RPZDs may also be known as reduced pressure principle (RP), reduced pressure principle backflow prevention devices, [1] [2] reduced pressure zone assemblies (RPZA), [3] or reduced pressure principle ...

  4. Hydronic balancing - Wikipedia

    en.wikipedia.org/wiki/Hydronic_balancing

    There are various balancing methods, but all involve measuring differential pressures and adjusting them to the correct value by calculating the flow which each one represents. Differential pressure controllers are usually membrane- or spring-driven valves that control the differential pressures in the installation. This simplifies balancing ...

  5. Control valve - Wikipedia

    en.wikipedia.org/wiki/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.

  6. Double check valve - Wikipedia

    en.wikipedia.org/wiki/Double_check_valve

    A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.

  7. Sleeve valve (water) - Wikipedia

    en.wikipedia.org/wiki/Sleeve_valve_(water)

    Sleeve valves can operate for long periods of time over a high differential pressure across the valve. When a cavitation condition does exist the cavitation takes place surrounded by water. Unlike other valves, air is not necessary to control or suppress the cavitation. Because of this a single sleeve valve can replace several standard valves ...

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