check valve

noun

1. a valve permitting liquids or gases to flow in one direction only.

check valve

noun

1. a valve that closes by fluid pressure to prevent return flow Also callednonreturn valve

Word History and Origins

Origin of check valve¹

First recorded in 1875–80

Example Sentences

When the plunger returns, the check valve closes, and the water is forced into the feed-pipe to the boiler.

From Project Gutenberg

There is one check valve in the supply pipe which conducts the water from the tank or well to the pump cylinder.

From Project Gutenberg

The globe valve next the boiler should never be closed, except when examining the boiler check valve.

From Project Gutenberg

You can always tell whether the trouble is in the second check or in the hot water check valve by opening the little drain cock.

From Project Gutenberg

Close the cock or valve next the boiler, and examine the boiler check valve; notice whether the pipe is getting limed up.

From Project Gutenberg