Check valve:

If the gas or liquid starts to reverse, the valve automatically closes, preventing reverse movement.

Commonly referred to as a one-way valve.

Terms Related to Check valve

• Valve

  A device used to control the rate of flow in a line to open or shut off a line completely, or to serve as an ...

• Safety valve

  1. An automatic valve that opens or closes when an abnormal condition occurs (e.g., a pressure relief valve on a separator that opens if the ...

• Standing valve

  A fixed ball-and-seat valve at the lower end of the working barrel of a sucker rod pump. The standing valve and its cage do not ...

• Back-pressure valve

  1. A valve used to regulate back-pressure on equipment or systems through which a fluid flows. 2. A valve used to regulate automatically a uniform ...

• Poppet valve

  A device that controls the rate of flow of fluid in a line or opens or shuts off the flow of fluid completely. When open, ...

• Pressure relief valve

  A valve that opens at a preset pressure to relieve excessive pressures within a vessel or line. Also called a relief valve, safety valve, or ...

• Relief valve

  A valve that will open automatically when pressure gets too high.