Pressure control and unloader valve

Details Pressure control and unloader valve Pressure control and unloader valve

1973-11-15

1976-04-27

Freeh, William L.

Pumps

Three or more cylinders arranged in parallel, radial, or...

Condition responsive fluid control

137116, 417302, 1371163, F04B 4900

Patent

active

039531546

ABSTRACT:
An improved pressure control valve and unloader valve incorporating a floating check valve which is responsive to a gradual restriction in the discharge line and is also responsive to the shock wave formed as a result of a sudden shut-off of the discharge line; and the combination of such a pressure control valve with a high pressure diaphragm pump.

REFERENCES:
patent: 1557426 (1925-10-01), Conrader
patent: 1780782 (1930-11-01), Holmes
patent: 2122045 (1938-06-01), Rose et al.
patent: 2173819 (1939-09-01), Boldt
patent: 2313351 (1943-03-01), Magnuson
patent: 2429489 (1947-10-01), Roth
patent: 2545712 (1944-06-01), Stevenson
patent: 2571154 (1951-10-01), Mercier
patent: 3143127 (1964-08-01), Frost
patent: 3481359 (1969-12-01), Robnick

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