key valve

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A device which regulates or closes off the flow of a fluid.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
The official, who is reportedly involved in an investigation into the landing, said improper alignment caused significant damage to the hatch and part of a key valve that equalizes pressure inside and outside the capsule.
"I am sure you will recall that you opened a key valve on this site on November 27, 2007.
The MT2500SZ produces the company's key valve components in a single setup, providing significant time savings on small quantity orders.