Definitions for clack valve
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Random House Webster's College Dictionary
clack′ valve`(n.)
a valve having a hinged flap permitting flow only in the direction in which the flap opens.
Category: Machinery
Origin of clack valve:
1855–60
Princeton's WordNet
clack valve, clack, clapper valve(noun)
a simple valve with a hinge on one side; allows fluid to flow in only one direction
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"clack valve." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/clack valve>.