Pressure actuated unit with high temperature protection

Details Pressure actuated unit with high temperature protection Pressure actuated unit with high temperature protection

1978-05-30

1980-09-30

Schwadron, Martin P.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200 83J, 200 82C, 137 75, F16K 1738, H01H 3534, H01H 3538

Patent

active

042257603

ABSTRACT:
A pressure fitting formed of fire resistant material, preferably stainless steel, contains a chamber communicating through an opening with a pressure responsive switch or other assembly formed at least in part of a less fire resistant material, such as aluminum, with a movable seal member being provided for transmitting force to a movable part of the assembly, and with a valve member which is also high temperature resistant being provided to automatically close off fluid flow from the chamber through the opening in the event of fire. The temperature response may be obtained by release of the valve resulting from melting down of part of the pressure responsive assembly, or by melting of a fusible element retaining the valve in open condition, or by both of these effects.

REFERENCES:
patent: 2736778 (1956-02-01), Buchanan
patent: 3245423 (1966-04-01), Hansen et al.
patent: 3618627 (1971-11-01), Wagner
patent: 3659624 (1972-05-01), Kelly et al.
patent: 3842853 (1974-10-01), Kelly et al.
patent: 3876835 (1975-04-01), Wicke
patent: 3876845 (1975-04-01), Griffith et al.

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