Stop valve

a valve that can be closed or opened at will, as by hand, for preventing or regulating flow, as of a liquid in a pipe; - in distinction from a valve which is operated by the action of the fluid it restrains.

stop valve

[′stäp ‚valv] (engineering) A valve that can be opened or closed to regulate or stop the flow of fluid in a pipe.

stop valve

A valve in a piping distribution network which is used to shut off a line.

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