valve [vælv]

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1. Replace the cylinder outlet seal and valve cap.
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2. Open vent needle valve and bleed air from hose. Then close vent valve.
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3. Adding air pressure within the annular space between the body and the sleeve can open, throttle, or close the valve.
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n.
  1. a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through i
  2. device in a brass wind instrument for varying the length of the air column to alter the pitch of a t
  3. control consisting of a mechanical device for controlling the flow of a fluid

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valve
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check valve
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plunger valve
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flapper valve
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changeover valve
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