Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Patent
1996-12-05
1999-09-14
Bennett, Henry
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
1375157, 137539, F16K 1726, F16K 1500
Patent
active
059506709
ABSTRACT:
A vacuum cup safety device selectively maintains pressure within a vacuum cup for an extended period of time until release of the vacuum is desired. The device includes a housing having first and second apertures extending through a first portion of the housing and in communication with a third aperture extending through a second portion of the housing. First and second seals are positionable within first and second apertures, and extend radially inwardly within the first and second apertures a predetermined distance for defining first and second check valve seats. First and second check valves composed of a hard, polished material are provided within the first and second apertures. Each of the first and second check valves is insertable within the respective aperture of the housing and is reciprocally movable therein between a first position seated with respect to the corresponding check valve seat and a second position longitudinally spaced from the corresponding check valve seat. First and second biasing springs are disposed within the respective first and second apertures for biasing the first and second check valves toward the first position. A lubricating film can coat the first and second check valves for reducing friction with respect to the housing and improving sealing characteristics as the first and second check valves move between the first and second positions.
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Bennett Henry
Kim Joanne Y.
Rayco Manufacturing Inc.
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