Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1996-01-24
1997-10-14
Michalsky, Gerald A.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
91420, F15B 1304
Patent
active
056761694
ABSTRACT:
The hydraulic counterbalance valve has a valve body with an inlet port, a cylinder port and a pilot port. The valve body has an interior chamber extending through the valve body which forms a check seat where the interior chamber narrows. The interior chamber is in communication with each port by a number of passages. A check valve is disposed in a first passageway between the interior chamber and the inlet port. A bypass passage exists to circumvent the check valve and provide communication between the interior chamber and the inlet port. A control spool is movably disposed in the interior chamber. The control spool has a pilot end, a sealing means, metered groove and a pilot check. The pilot check of the control spool forms a pilot check seal with the check seat of the interior chamber. A spool spring is disposed in the interior chamber and biases the control spool pilot check to seat against the pilot check seat of the interior chamber. The metered groove on the control spool act to permit metered flow from the chamber to the bypass passageway incident to hydraulic pressure at the pilot port sufficient to overcome the force of the spool spring.
REFERENCES:
patent: 3817154 (1974-06-01), Martin
patent: 4006663 (1977-02-01), Baatrup et al.
patent: 4172582 (1979-10-01), Bobnar
patent: 4244275 (1981-01-01), Smilges
patent: 4266464 (1981-05-01), Baatrup et al.
patent: 4291718 (1981-09-01), Sanin et al.
patent: 5400816 (1995-03-01), Gerstenberger
Michalsky Gerald A.
Power Team Division of SPX Corporation
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