Liquid purification or separation – Flow – fluid pressure or material level – responsive – Check valve
Patent
1992-03-30
1993-09-07
Dawson, Robert A.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Check valve
210234, 210431, 55420, 137528, 137537, 251 82, B01D 2710
Patent
active
052425819
ABSTRACT:
A shut-off valve for use in a filtration system with a filter element having a tubular coupling member at one end arranged so that when the filter is installed in the system the coupling element extends into a tubular housing to displace a spool to thereby permit flow through the filter element, the spool being returned by a compression spring to a closed position within the housing to shut off flow when the filter element is removed, the tubular housing having a pair of spaced apart internal sealing faces and the spool having a matching pair of spaced apart sealing surfaces that close against each other when the spool is in the closed position to thereby prevent flow through the valve. The valve is arranged in such a way that when in the closed position fluid pressure applied to the valve exerts force on the spool to urge it more tightly into the closed position.
REFERENCES:
patent: 2518387 (1950-08-01), Shaw
patent: 2832641 (1958-04-01), Korda
patent: 3036593 (1962-05-01), Sauille
patent: 4806217 (1989-02-01), Rosenberg
patent: 4967791 (1990-11-01), Sternberger
Dawson Robert A.
Facet Quantek, Inc.
Millard W. L.
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