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ball valve definition

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a shutoff valve of the packed type that incorporates a round, internal dynamic member, or "ball," and containing one or more through holes that connect the ports of the valve to each other. [SEMI International Standards 1990, Vol. 1, Glossary] Also see packed valve .

See also:

Atomic Radius definition
Autoionization definition
Autoionization definition
Auxotroph definition
Axial, Equatorial definition