Valve seat

(Mach.)	The fixed surface on which a valve rests or against which it presses.
	A part or piece on which such a surface is formed.

valve seat

[′valv ‚sēt] (design engineering) The circular metal ring on which the valve head of a poppet valve rests when closed.

The stationary portion of a valve which, when in contact with the movable portion, stops flow completely.

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