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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

   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 valve is termed ...

4. Pressure regulator - Wikipedia

   en.wikipedia.org/wiki/Pressure_regulator

   Pressure regulator

5. Globe valve - Wikipedia

   en.wikipedia.org/wiki/Globe_valve

   Globe valve - Wikipedia ... Globe valve

6. Relief valve - Wikipedia

   en.wikipedia.org/wiki/Relief_valve

   Relief valve - Wikipedia ... Relief valve

7. Pilot-operated relief valve - Wikipedia

   en.wikipedia.org/wiki/Pilot-operated_relief_valve

   PORV are also called pilot-operated safety valve (POSV), pilot-operated pressure relief valve (POPRV), or pilot-operated safety relief valve (POSRV), depending on the manufacturer and the application. Technically POPRV is the most generic term, but PORV is often used generically (as in this article) even though it should refer to valves in ...