Flap valve

Details Flap valve Flap valve

2005-04-19

2005-04-19

Douglas, Steven O. (Department: 3751)

Valves and valve actuation

Rotary valves

Butterfly

C123S337000

Reexamination Certificate

active

06880807

ABSTRACT:
A flap valve for controlling a gas flow has an elastically deformable valve tube that conveys the gas flow and having a valve flap that is disposed in the valve tube for movement between an open position and a closed position by a flap shaft that can be driven in order to adjust the valve flap and which is disposed at an acute angle in relation to the valve tube axis, to which shaft the valve flap is fastened so that in the closed position of the valve flap, the flap normal encloses an acute angle with the valve tube axis, in order to assure only a slight amount of leakage in the closed position of the valve flap and a low opening torque, the outer contour of the valve flap is approximately oval in shape. Preferably, the outer contour is embodied as an ellipse.

REFERENCES:
patent: 2882010 (1959-04-01), Bryant
patent: 3627261 (1971-12-01), Ludeman
patent: 6604516 (2003-08-01), Krimmer et al.
patent: 6659427 (2003-12-01), Krimmer et al.
patent: 199 34 113 (2001-01-01), None

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