Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible
Patent
1981-03-17
1983-07-19
Weakley, Harold W.
Fluid handling
Destructible or deformable element controlled
Heat destructible or fusible
137 74, 251328, F16K 1304
Patent
active
043938892
ABSTRACT:
A fire-safe valve structure for a valve of the type having a valve body with a flow passage (18, 20) therethrough and a valve chamber which houses a valve element (70) for opening and closing the flow passage, the valve chamber becoming sealed off from the flow passage in the open and closed conditions. An annular metallic seat (110) with a port (200), which extends between its inner and outer annular surfaces (186, 188) and so located as to communicate the valve chamber with the flow passage, is disposed in an annular seat pocket (28) formed around the flow passage (20) on the upstream side of the valve. The seat pocket (28) opens to the valve chamber (50) and the metallic seat (110) is provided with sealing means (196) for sealing with the valve element (70) in the open or closed condition. A relief plug (202) of a selected temperature degradable material is positioned within the port (200) so that when the chamber is sealed off and the plug (202 ) is exposed to the environment within the valve chamber (50), the plug (202) will evacuate the port (200) at the degradation temperature of the plug material or will be ejected from the port (200) at a preselected pressure differential between the valve chamber (50) and flow passage (20), whichever first occurs. The pressure build-up in the valve chamber (50) which results from rising temperature is then relieved by communication of the chamber through the port (200) to the upstream flow passage (20).
REFERENCES:
patent: 1740420 (1929-12-01), Friedman
patent: 1876938 (1932-09-01), Horne
patent: 2047654 (1936-07-01), Te Pas
patent: 3177887 (1965-04-01), Priese
patent: 3349789 (1967-10-01), Crain
patent: 3559948 (1971-02-01), Grove
patent: 3776457 (1973-12-01), Cardi
patent: 4139005 (1979-02-01), Dickey
patent: 4160460 (1979-07-01), Kemp
Binegar Scott W.
Saka Hamid J.
ACF Industries Incorporated
Marnock Marvin J.
Weakley Harold W.
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