Fluid handling – Removable valve head and seat unit – Threaded into valve casing
Patent
1984-10-25
1986-02-04
Nilson, Robert G.
Fluid handling
Removable valve head and seat unit
Threaded into valve casing
60425, 1374546, 137474, 1375123, 137529, F16K 1500
Patent
active
045679118
ABSTRACT:
A cartridge type directional control valve assembly includes an elongated housing having a bore and a plug threaded in the outer end of the housing adjacent the bore. A changeover, spring biased piston forming a load senser or pressure sensor is provided in the bore with a sealing O ring therebetween. A coil spring is interposed between the plug and the changeover piston. The plug has a vent passage for venting the chamber of the coil spring. A valve retaining screw located in the housing, is centrally apertured and loosely receives the shank of the cone or flow control valve. A coil spring is nested within the valve retaining screw and bears against the flow control valve which is normally seated with respect to a central aperture within the cone valve insert seat. A floating ball check valve is nested within the cartridge assembly and is axially aligned with and opposite from the flow control valve. The control valve and ball check valve control flow across their respective valve seats. One end of the load sensor changeover piston is axially aligned and engageable with the flow control valve. The cartridge control valve may be conveniently removed and replaced in a hydraulic control circuit when required.
REFERENCES:
patent: 2539739 (1951-01-01), Grime
patent: 3134232 (1964-05-01), Barosko
patent: 4192343 (1980-03-01), Grahac
patent: 4223693 (1980-09-01), Kosarzecki
Equipment Company of America
Nilson Robert G.
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