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 ?
Installation of flap valve at Bishop Allen Drive/School Street intersection and associated structures and diversion structures and piping for grit removal and overflow weir to the stormwater tank on Bishop Allen Drive.
A flap valve will be fitted to prevent river water backing up into the site and flooding under the arches.
Wienstein in 1899 reported caecal bascule as folding of caecum anterior to ascending colon producing a flap valve occlusion to caecal emptying.
sup][1] The main purpose of these techniques is to provide the flap valve mechanism to temporarily close the ureter under increased intravesical pressure and also to provide a nonobstructed urinary flow toward the bladder with a normal ureteral peristalsis.
With the Plattco double flap valve, the object just lands on the flapper and passes through without disrupting the manufacturing process.
made explosion flap valve to be certified by an independent testing agency to comply with NFPA standards.
3 Novick et al reported Flap valve double patch closure of VSD having hospital deaths 7.
Officers discovered it was coming from a combined sewer outfall with a flap valve next to Pipe Bridge, which was believed to be part of the NWL sewer network.
A flap valve for instance is in general a very flat creation in contrary to an umbrella valve that requires some height.
Through co-ordination between the borough and county councils and the Environment Agency, ditch pipework has been installed, a retaining wall raised, silt removed and a new flap valve installed.
Unlike prior endoscopic treatments for reflux, the molding of the flap valve that holds back acid is expected to be much more robust and effective," the expert added.
If you are constantly pushing the lever and no water is siphoning into the pan, or you need to push the handle three to four times before it flushes, it means the diaphragm or flap valve has been worn or damaged and you will need to replace it.