Flap valve

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(Mech.) a valve which opens and shuts upon one hinged side; a clack valve.

See also: Flap

References in periodicals archive ?
In 16-second cycles, flapper valves were molded on an all-electric, 55-ton Engel e-max press equipped with a 12 mm screw.
A new version of the GlassVu GVL motorized vacuum loader has a new discharge assembly with a pneumatic, positive-seal discharge valve said to prevent leaks that can occur with flapper valves.
Located at the base of the loader body, the discharge assembly efficiently controls the flow of materials with a pneumatically driven, positive-seal discharge valve that prevents vacuum leaks associated with flapper valves.
In addition to the lower rate, Cal-Am agreed to conduct a water-use audit in Chualar, help fix leaks by paying to reinstall flapper valves in toilets and washers in faucets and do a cost-of-service study to determine a more reasonable rate for residents.
Repair dripping faucets and leaking toilets, usually caused by flapper valves in need of replacement (this can save more than 10 gallons of water per person per day; a faucet dripping at one drop per second wastes 2,700 gallons per year).