Fluid handling – Diverse fluid containing pressure systems
Patent
1985-08-30
1987-05-26
Marcus, Stephen
Fluid handling
Diverse fluid containing pressure systems
137386, F16K 2118
Patent
active
046676945
ABSTRACT:
A safety valve for compressed liquid gas fuel tanks that has no man-movable parts and is completely automatic during the filling procedure. A movable piston within the valve body is responsive to pressure developing within an expansion chamber. The expansion chamber is connected to a 20% valve associated with the fuel tank and when liquid gas is detected the liquid expands and cools causing a thermal operated valve to transfer. Transferring of the thermal valve closes a port and prevents venting of the expansion chamber. Pressure building up in the expansion chamber causes the piston to automatically move, thereby shutting off the flow of fuel from the supply to the fuel tank. The filling procedure when restarted, after the thermal valve has warmed up sufficiently to return to its normal state, allows the pressure in the supply tank to transfer the piston and again allows fuel to enter the fuel tank, thereby preventing the operator from over-filling the fuel tank with compressed liquid gas and subsequent rupture of the vessel due to liquid expansion.
REFERENCES:
patent: 1848031 (1932-03-01), Spencer
patent: 3812888 (1974-05-01), Dalton
patent: 4191208 (1980-03-01), Mylander
patent: 4208994 (1980-06-01), Kitamura
Marcus Stephen
Thronson Mark
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