Pressure relief valve

Details Pressure relief valve Pressure relief valve

1993-12-09

1995-05-02

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

13751629, 251 86, 251363, F16K 1503

Patent

active

054110564

ABSTRACT:
A pressure relief valve, for pressurized 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. The flap valve is supported through an arm by a ball joint allowing a limited pivotal movement, and the valve seat is located in the valve passage by an O-ring allowing a limited degree of float in its own plane.

REFERENCES:
patent: 430301 (1890-06-01), Scheck
patent: 4116419 (1978-09-01), Diehl
patent: 4586534 (1986-05-01), McNeely
patent: 4674575 (1987-06-01), Guess
patent: 4856547 (1989-08-01), Solaroli

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