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Flow control valves, a type of automatic control valve, regulate fluid flow by maintaining a predetermined flow rate, independent of variations in system pressure. These valves achieve this using pressure-compensated mechanisms, which automatically adjust the valve opening to ensure a steady flow rate.
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.
Rotary valves and piston valves: parts of brass instruments used to change their pitch; Rotolock valve; Rupture disc: a one-time-use replaceable valve for rapid pressure relief, used to protect piping systems from excessive pressure or vacuum; more reliable than a safety valve; Saddle valve: where allowed, is used to tap a pipe for a low-flow need
Internal parts of a typical globe valve. The body is the main pressure-containing structure of the valve and the most easily identified as it forms the mass of the valve.It contains all of the valve's internal parts that will come in contact with the substance being controlled by the valve.
Power-operated actuators, using gas pressure, hydraulic pressure or electricity, allow a valve to be adjusted remotely, or allow rapid operation of large valves. Power-operated valve actuators may be the final elements of an automatic control loop which automatically regulates some flow, level or other process.
With no moving parts, Tesla valves are much more resistant to wear and fatigue, especially in applications with frequent pressure reversal such as a pulsejet. [5]A micrograph of a Tesla valve in a fixed-valve micro-pump, with flow from right to left restricted [6]