Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1992-11-16
1993-11-16
Rivell, John
Fluid handling
Line condition change responsive valves
Direct response valves
137536, 137543, F16K 2110
Patent
active
052614506
ABSTRACT:
A device relieves a positive pressure difference between the inside of a vessel and the outside of the vessel through an opening in the vessel. The device has a base portion, a cap portion and a biasing means. The base portion has a means for mounting the device in the opening; a cap seat providing an orifice through which the pressure difference may be relieved; and a generally hollow body portion attached to the cap seat and extending concentrically with the cap seat into the vessel. The cap portion has a cap having an external surface with a diameter larger than the diameter of the cap seat to retain the cap external to the cap seat in sealing relationship; a rod mounted concentrically and normal to the internal surface at one end, the other end extending into the body portion and terminating in a piston with a shoulder, the piston being in concentric sliding engagement within the body portion. The biasing means has a compression spring acting between the interior of the body portion and the piston shoulder to urge the cap into sealing relationship with the cap seat; and a damping means with the piston effectively dividing the body portion into first and second chambers, a channel communicating one chamber to the other and a fluid in the chambers so movement of the piston in either direction requires a portion of the fluid to pass through the channel from one chamber to the other.
REFERENCES:
patent: 949208 (1910-02-01), Ballard
patent: 1868504 (1932-07-01), Kuhl
patent: 2373046 (1945-04-01), Osborn, Jr.
patent: 3131718 (1964-05-01), Mingrone
patent: 3586033 (1971-06-01), Hieber
patent: 4270569 (1981-06-01), Reay et al.
patent: 4813452 (1989-03-01), Smith
patent: 4867603 (1989-09-01), Chang
49 CFR & 178.345-10 (b)(ii).
TTMA Recommended Practice RP-81-90, Jun. 29, 1990.
Betts Industries, Inc.
Rivell John
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