Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Reexamination Certificate
2005-12-01
2008-07-01
Hepperle, Stephen M (Department: 3753)
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
C137S493900
Reexamination Certificate
active
07392823
ABSTRACT:
Improvement in a combination valve including check valve and pressure relief valve portions for regulating fluid flow pressure and direction in a hydraulic circuit, wherein a valve seat includes, in addition to a central aperture, a plurality of peripherally-spaced axial cross-port orifice holes, of same or differing diameter and a plurality of intersecting, circumferentially-spaced, radial, semicircular holes; a spring cap including four adjoining axial portions of differing outer diameters, with a first portion being a protrusion that locates an end of a relief valve compression spring, a second portion having flat outer tool locating surfaces used for rotating the spring cap for axial adjustment relative to a valve stem, a third portion having a reduced radial wall thickness for easy crimping thereof relative to a valve stem, and a fourth portion having a coaxial recess for centering and physically retaining one end portion of a check valve compression spring.
REFERENCES:
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patent: 2 064 069 (1981-06-01), None
Dong Xingen
Ellenburg Albert C.
Holzschuh Frank P.
Hepperle Stephen M
Parker-Hannifin Corporation
Pophal Joseph J.
Whitman Daniel J.
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