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2. Flow control valve - Wikipedia

   en.wikipedia.org/wiki/Flow_control_valve

   A flow control valve regulates the flow or pressure of a fluid. ... The control valve manipulates a flowing fluid, such as gas, steam, water, or chemical compounds ...

3. Choked flow - Wikipedia

   en.wikipedia.org/wiki/Choked_flow

   Accidental release source terms includes mass flow rate equations for non-choked gas flows as well. Orifice plate includes derivation of non-choked gas flow equation. de Laval nozzles are venturi tubes that produce supersonic gas velocities as the tube and the gas are first constricted and then the tube and gas are expanded beyond the choke plane.

4. 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.

5. Mass flow controller - Wikipedia

   en.wikipedia.org/wiki/Mass_flow_controller

   The flow rate is specified as a percentage of its calibrated full scale flow and is supplied to the MFC as a voltage signal. Mass flow controllers require the supply gas or liquid to be within a specific pressure range. Low pressure will starve the MFC of fluid and cause it to fail to achieve its setpoint. High pressure may cause erratic flow ...

6. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Gas pressure regulator regulates the flow and pressure of a gas; Heart valve: regulates blood flow through the heart in many organisms; Hydrodynamic vortex valve: a passive flow control valve that uses hydrodynamic forces to regulate flow; Larner–Johnson Valve: needle control valve often in large sizes used in water supply systems

7. Flow coefficient - Wikipedia

   en.wikipedia.org/wiki/Flow_coefficient

   The use of the flow coefficient offers a standard method of comparing valve capacities and sizing valves for specific applications that is widely accepted by industry. The general definition of the flow coefficient can be expanded into equations modeling the flow of liquids, gases and steam using the discharge coefficient.