Improved butterfly valve

Valves and valve actuation – Rotary valves – Butterfly

Patent

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Details

251305, F16K 1226

Patent

active

046014594

ABSTRACT:
A butterfly valve comprising a body 1, a passage 2 extending through the body, a closure or butterfly member 3 mounted in the passage 2 to pivot about an axis orthogonal to the axis of the passage so as to be movable between a closing position in which a sealing element fixed or formed on the periphery of the disc of the closure member has a sealing contact with a seat 8 carried by the body and a fully open position roughly perpendicular to the closing position, the peripheral surface of the closure member 3 and the conjugate surface of the seat 8 being conical surfaces defined by two cones of revolution, while the axis of rotation of the closing member is offset along the axis of the passage in a direction away from the apex of the cone defining the surface of the seat relative to the mean plane of the disc of the closing member, wherein for a given value of the apex angle 2.phi. of the cone C.sub.1 defining the seat of the valve and for a given position C of the axis of rotation of the butterfly member in an orthonormal system Ox,y,z of which one of the axes is coincident with the axis of said cone, there is defined a joint plane of the butterfly member with its seat of which a couple of points in respect of which the minimum angle of disengagement is maximum, has for trace a point Q located in the plane (Ox,z) of the system and of which the coordinates and the angle of disengagement are given by the following approximate relations: ##EQU1##

REFERENCES:
patent: 3275289 (1966-09-01), Fawkes
patent: 3521857 (1970-07-01), Over
patent: 3931955 (1976-01-01), Jacobs
patent: 4037819 (1977-07-01), Kindersley
patent: 4281817 (1981-08-01), Adams et al.
patent: 4284264 (1981-08-01), Hubertson
patent: 4436281 (1984-03-01), Chiron
patent: 4480815 (1984-11-01), Kreij

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