Flap valve

Details Flap valve Flap valve

2005-01-18

2005-01-18

Keasel, Eric (Department: 3754)

Valves and valve actuation

Rotary valves

Butterfly

C251S314000, C123S337000

Reexamination Certificate

active

06843467

ABSTRACT:
In a flap valve for controlling a gas flow, with a valve tube that conveys the gas flow and a valve flap, which is disposed in the valve tube, is non-rotatably supported on an adjustable flap shaft, and can be pivoted between an open position that maximally unblocks the tube cross section and a closed position that blocks the tube cross section, in order to produce a high degree of tightness of the flap valve with the least possible torque, the tube end of the valve tube is inclined so that the circumferential tube edge is essentially disposed in a plane extending at an acute angle in relation to the tube axis. The valve flap has an approximately elliptical outer contour and is disposed in the valve tube at or near the inclined tube end so that its tube normal encloses an acute angle with the tube axis. The valve flap and/or the valve tube may be totally or partially embodied so that they can be elastically deformed and/or tilted.

REFERENCES:
patent: 2789785 (1957-04-01), Woods
patent: 2907548 (1959-10-01), Maas
patent: 3480254 (1969-11-01), Fawkes
patent: 3779511 (1973-12-01), Wenglar
patent: 3877678 (1975-04-01), Jung
patent: 4290615 (1981-09-01), Etcheverry
patent: 5531205 (1996-07-01), Cook et al.
patent: 6135415 (2000-10-01), Kloda et al.
patent: 6604516 (2003-08-01), Krimmer et al.
patent: 6659427 (2003-12-01), Krimmer et al.

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