Butterfly flap valve

Details Butterfly flap valve Butterfly flap valve

1994-06-16

1996-09-03

Fox, John C.

Valves and valve actuation

With means to increase head and seat contact pressure

With positive reduction

251161, F16K 122

Patent

active

055516661

ABSTRACT:
Butterfly flap valve (10) comprising a valve housing (12) with an axial flow aperture (14), a flap shaft (16) that projects out of the valve housing (12), crosses the flow aperture (14) substantially diametrically and can be operated by means of a drive mechanism disposed outside the valve housing (12), and a closure flap (22) attached to the flap shaft (16) to close the flow aperture.
In this system, to move the closure flap (22) out of the closed position into the position in which the flow aperture (14) is open, the closure flap (22) is first lifted away from the valve seat (24) and then swiveled within the flow aperture (14) by way of the connection of the flap shaft (16) both to a lever system (28), consisting of a first lever element (44) and a second lever element (46), and to an actuator shaft (30) coupled to the drive mechanism. The same connections also operate for movement of the closure flap (22) out of the open position into the closed position, in which the closure flap (22) is first swiveled within the flow aperture (14) and subsequently set onto the valve seat (24).

REFERENCES:
patent: 2577725 (1951-12-01), Drake
patent: 2833511 (1958-05-01), Fletcher
patent: 3030065 (1962-04-01), Wallace
patent: 3272223 (1966-09-01), Sass
patent: 3306571 (1967-02-01), Bussi et al.
patent: 3591127 (1971-07-01), Luger et al.

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