Fluid handling – Processes
Patent
1979-08-28
1983-03-15
Walton, George L.
Fluid handling
Processes
137DIG8, 251 50, 251 612, 251 611, 251331, 251335A, 251 25, F17D 300, F16K 31126
Patent
active
043764444
ABSTRACT:
A diaphragm-type check valve for vacuum pipes is provided which enables opening of the valve using substantially less operating force than is required in conventional valves of the same size and type. The valve includes a flexible diaphragm which is disposed in the pipe and is held in its closed position by the vacuum in the pipe. A mechanical operator such as a vacuum-actuated piston causes opening of the valve. A cavity located on the side of the diaphragm opposite that which is exposed to the pipe vacuum is selectively connected to a source of suction or vacuum (preferably that provided by the pipe itself) so as to substantially equalize the pressure on both sides of the diaphragm and thereby enable opening of the valve with a less bulky operating mechanism that provides only the reduced operating force referred to above.
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patent: 3719343 (1973-03-01), Werra
patent: 3838707 (1974-10-01), Wachowitz, Jr.
Electrolux GmbH
Walton George L.
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