Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1980-06-06
1981-11-17
Cline, William R.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
60380, 13762414, 91355, 91356, F16K 3112, F15B 1115
Patent
active
043005845
ABSTRACT:
A hydraulic sequencing valve is disclosed. A hollow spool is slidably carried in a valve body for motion between a first position in which fluid is caused to flow out a valve first port and a second position in which fluid is caused to flow into the first port. An annular partition is provided within the spool hollow, which divides the spool hollow into two chambers. When a pressure rise is experienced within the spool, a pre-set valve element trips, reducing pressure within one spool chamber. This pressure change shifts the spool to a second position. A check valve is provided in a separate valve body conduit. This check valve operates to assure that the valve spool remains in its second position until the valve and associated hydraulic system have completed the full cycle of operation.
REFERENCES:
patent: 3665810 (1972-05-01), Parrett
patent: 3799032 (1974-03-01), Honeycutt
patent: 3817154 (1974-06-01), Martin
patent: 3955478 (1976-05-01), Feucht
Cline William R.
Modular Controls Corporation
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