Pressure relief valve

Details Pressure relief valve Pressure relief valve

1989-02-03

1989-08-15

Rivell, John

Fluid handling

Destructible or deformable element controlled

Heat destructible or fusible

137 79, 1375276, F16K 1706, F16K 1738

Patent

active

048565474

ABSTRACT:
A pressure relief valve, for pressurised fluid storage vessels such as a rail tank car for volatile liquids, has a flap valve for rotational movement in a valve passage between a closed position seated on a valve seat and blocking the passage and an open position in which the passage is substantially unobstructed. A spring arrangement for keeping the valve closed against a rated pressure includes an externally mounted spring system which, when exposed to fire conditions which might threaten the wall strength of the vessel, loses spring temper so as to reduce the closing pressure of the valve.

REFERENCES:
patent: 2036391 (1936-04-01), Bradley
patent: 2444130 (1948-06-01), Crowe
patent: 2480986 (1949-09-01), Walker
patent: 2564295 (1951-08-01), Renz et al.
patent: 2647534 (1953-08-01), Freeman
patent: 2767735 (1956-10-01), Darling
patent: 3455316 (1969-07-01), Rogers
patent: 3789874 (1974-02-01), Hills
patent: 4099551 (1978-07-01), Billington et al.
patent: 4458711 (1984-07-01), Flider
patent: 4732188 (1988-03-01), Gabrlik et al.
"A Study of Pressure Tank Car Safety Relief Valve Sizing Requirements", Jan. 18, 1983, Association of American Railroads.
"Safety Relief Valve Literature Search & Synthesis", Report No. 81-6, Aug. 1981, Canadian Institute of Guided Ground Transport.
"Lyons Valve Designers Handbook", Van Nostrand, 1982, Ed. J. Lyons, pp. 92-101 and 125-131.

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