flap valve

(redirected from flapper valves)
Also found in: Dictionary.

flap valve

[′flap ‚valv]
(mechanical engineering)
A valve fitted with a hinged flap or disk that swings in one direction only.

flap valve

In plumbing, a check valve in the form of a hinged disk which permits flow in one direction only.
Mentioned in ?
References in periodicals archive ?
Simple light plastic flapper valves prevent backflow through the upper vents at night.
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.
Analyzing the Challenger disaster on January 28, 1986, the Presidential Commission noted other problems beside the previously identified risks of O-rings at low temperatures: inadequate spare parts; lack of training in maintenance; improper management planning; and safety problems with the main engine, brakes, flapper valves, and automatic landing system - plus a serious reduction in the quality-assurance effort.
They can waste large volumes of water from constant slow leaks or intermittent sticking of internal parts like floats and flapper valves.
Custom manufactured silicone seals, especially designed for use in flapper valves on aircraft evacuation chutes and life raft inflation systems, are available from this molded rubber products manufacturer.
Simple light plastic flapper valves prevent back flow through the upper vents at night.
However, this list is not inclusive of all the steel work which shall be re-coated under this specification and there are several appurtenances, brackets, flapper valves, scrapers and other miscellaneous small items which have not been specifically identified in this specification, but which shall be re-coated.