Combination thermal or pressure activated relief valve

Details Combination thermal or pressure activated relief valve Combination thermal or pressure activated relief valve

1987-04-29

1988-05-17

Weakley, Harold W.

Fluid handling

Destructible or deformable element controlled

Destructible element

137 73, 137 74, 220 89A, 220 89B, F16K 1714

Patent

active

047443820

ABSTRACT:
A combination thermal or pressure activated relief valve is disclosed. The valve includes a housing having an inlet and an outlet formed therein. The inlet is adapted to be attached to a pressure source while the outlet is in communication with an area having a lower pressure value than said pressure source. An insert is secured in the outlet and includes a stem having a first passage formed therethrough and a helical groove formed about its outer periphery. The groove cooperates with the housing to form a helical passageway between the inlet and the outlet. A fusible material is inserted into the helical passageway and normally blocks fluid flow therethrough and is fusible at a selected temperature to permit fluid flow therethrough. A second member is secured to the insert and has a passage formed therethrough which communicates with the first passage formed in the insert. A pressure responsive lamina is positioned across the passage for normally blocking fluid flow therethrough. The lamina is rupturable in response to a selected pressure arising at the pressure source so as to permit pressurized fluid to be released to the lower pressure area.

REFERENCES:
patent: 47076 (1865-03-01), Smith
patent: 195367 (1877-09-01), Hiller
patent: 2133461 (1938-10-01), McAbee
patent: 2356283 (1944-08-01), Steins
patent: 2580426 (1952-01-01), Heigis
patent: 2743036 (1956-04-01), Wachtell
patent: 4085860 (1978-04-01), Hawkins
patent: 4352365 (1982-10-01), Boccardo

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