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2. 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 ...

3. Pressure regulator - Wikipedia

   en.wikipedia.org/wiki/Pressure_regulator

   Supplementary oxygen may also be dispensed through a regulator which both reduces the pressure, and supplies the gas at a metered flow rate, to be mixed with ambient air. [8] One way of producing a constant mass flow at variable ambient pressure is to use a choked flow, where the flow through the metering orifice is sonic. For a given gas in ...

4. Instrumentation in petrochemical industries - Wikipedia

   en.wikipedia.org/wiki/Instrumentation_in...

   A split range pressure controller may also modulate a Joule-Thomson valve across the turbo-expander. [10] [4] Pressure in blanketed tanks is maintained by self actuating pressure control valves (PCVs). As liquid is withdrawn from the tank the pressure in the gas space falls. The blanket gas supply valve opens to maintain the pressure.

5. Gas flow computer - Wikipedia

   en.wikipedia.org/wiki/Gas_flow_computer

   Originally the gas flow computer was a mechanical (1920s technology) or later a pneumatic or hydraulic computing module (1940s technology used to the early 1990s but still available from a number of suppliers), subsequently superseded in most applications by an electronic module, as the primary elements switched from transmitting the measured variables from pneumatic or hydraulic pressure ...

6. Thermal expansion valve - Wikipedia

   en.wikipedia.org/wiki/Thermal_expansion_valve

   Flow control, or metering, of the refrigerant is accomplished by use of a temperature sensing bulb, filled with a gas or liquid charge similar to the one inside the system, that causes the orifice in the valve to open against the spring pressure in the valve body as the temperature on the bulb increases.

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8. Gas cylinder - Wikipedia

   en.wikipedia.org/wiki/Gas_cylinder

   Smaller containers may be termed gas cartridges, and larger may be termed gas tubes, tanks, or other specific type of pressure vessel. A gas cylinder is used to store gas or liquefied gas at pressures above normal atmospheric pressure. [2] In South Africa, a gas storage cylinder implies a refillable transportable container with a water capacity ...

9. Pilot-operated relief valve - Wikipedia

   en.wikipedia.org/wiki/Pilot-operated_relief_valve

   The pressure at which the control pilot relieves is the functional set pressure of the PORV. When the pilot valve reaches set pressure it opens and releases the pressure from the dome. The piston is then free to open and the main valve exhausts the system fluid. The control pilot opens either to the main valve exhaust pipe or to atmosphere ...