Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1979-01-29
1980-07-29
Cline, William R.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
137111, 91424, F16K 1700
Patent
active
042146011
ABSTRACT:
A single small safety valve is furnished for use with hazardous machinery that requires simultaneous actuation and continuous pressure on two hand valves at points out of the danger zone of such machinery. Operating characteristics are achieved by a housing having an axial bore, a piston moving within that axial bore, input ports, output ports and an exhaust port located at suitable positions on the housing. The arrangement of these ports is such that open fluid communication can exist between the two input and output ports only if the input ports are pressurized within a small time interval necessary to retain the piston in a neutral position in the axial bore, and if said inputs are held to maintain pressurization during the time that it is desired to maintain pressure in the output ports. Operation of the hazardous machinery is contingent upon continuous pressurization at the output ports. If either input port ceases to be pressurized at any time, then the piston shifts, resulting in the output of the device becoming connected to the exhaust port, which disables the hazardous machinery.
REFERENCES:
patent: 2598907 (1952-06-01), Griffin
patent: 2778372 (1957-01-01), Jaquith
patent: 3273582 (1966-09-01), Valentine
patent: 3848848 (1974-11-01), Ditirro
Cline William R.
Van Der Wall Robert J.
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