Vacuum valve

Details Vacuum valve Vacuum valve

1994-09-21

1996-11-19

Lee, Kevin

Valves and valve actuation

Fluid actuated or retarded

Flexible wall expansible chamber reciprocating valve actuator

137205, F16K 31126

Patent

active

055754546

ABSTRACT:
A vacuum valve including a casing having an inlet opening, an outlet opening, and a valve seat, a valve body accommodated in the casing and adapted to move rectilinearly between a position where it rests on the valve seat and a position which is away from the valve seat, means for pressing the valve body to the resting position, and a piston chamber in which an air differential pressure acts so as to separate the valve body from the valve seat against the pressing means, wherein the casing has a front wall portion which is at an acute angle to the direction of a streamline connecting the inlet and outlet openings and so that elongate foreign matter flowing in from the inlet opening can readily flow out, and side and rear wall portions expanding outwardly in a direction approximately perpendicular to the axis of the valve from a position near the valve seat so that bulk foreign matter flowing in from the inlet opening will not get caught between the valve body and the casing inner wall.

REFERENCES:
patent: 2269404 (1942-01-01), Haven
patent: 3812398 (1974-05-01), Kozel et al.
patent: 5082238 (1992-01-01), Grooms et al.
patent: 5280872 (1994-01-01), Yamanaka

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