flap valve

American  

noun

1. clack valve.

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Etymology

Origin of flap valve

First recorded in 1865–70

Example Sentences

A flap valve is provided between the two chambers to prevent the gasoline in the lower one from being sucked back into the upper one.

From Aviation Engines Design?Construction?Operation and Repair by Pag?, Victor Wilfred

First of all, a flap valve under such conditions would not remain watertight, unless it were attended to almost every day, which is, of course, impracticable when the outlet is below water.

From The Sewerage of Sea Coast Towns by Adams, Henry C.

Schemes have been suggested in which it was proposed to utilise a flap valve on the outlet so as to render the discharge of the sewage automatic.

From The Sewerage of Sea Coast Towns by Adams, Henry C.

A light flap valve to keep out the cold in winter is also a desirable feature for the overflow pipe.

From Rural Hygiene by Ogden, Henry N. (Henry Neely)

From the bottom of the condenser a short pipe leads to the air pump J, and in this pipe there is a flap valve, called the foot valve, opening towards the air pump.

From A Catechism of the Steam Engine by Bourne, John, C.E.