Flap valve

Details Flap valve Flap valve

1991-03-25

1992-06-02

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

F16K 1514

Patent

active

051178710

ABSTRACT:
A flap valve comprising an annular frame (10) defining an opening (11) through which liquid may flow in one direction, a closure flap (14) for said opening connected to the frame (10) by a hinge member (15), and a valve seat (12) against which the closure flap (14) may close to prevent reverse flow of liquid through the opening. The frame (10) may be bolted (at 18) to a wall or pipe flange, with integral sealing ribs (24, 25) on the rear face of the frame avoiding the need for a separate gasket. The entire assembly comprising frame, closure flap, hinge, valve seat and sealing ribs, is integrally moulded from a plastics material and is reinforced where appropriate by embedded steel plates (19, 20 and 21).

REFERENCES:
patent: 249557 (1881-11-01), Truesdell
patent: 1956691 (1934-05-01), McCune
patent: 3152608 (1964-10-01), Morrison
patent: 3292658 (1966-12-01), Scaramucci
patent: 4022245 (1977-05-01), Davis

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