Pumps – Three or more cylinders arranged in parallel – radial – or... – Condition responsive fluid control
Patent
1996-07-23
1997-12-23
Freay, Charles G.
Pumps
Three or more cylinders arranged in parallel, radial, or...
Condition responsive fluid control
417296, 417298, 123506, 137522, 1374875, F04B 126
Patent
active
057001367
ABSTRACT:
A pump which has a digitally controlled internal by-pass valve. The pump includes a housing which has a pumping chamber that contains a piston which pumps fluid from an inlet port to an outlet port of the housing. The pump also has an intake valve that moves to an open position when the pump draws in fluid and moves to a closed position when the piston pumps the fluid through the outlet port. The intake valve can be maintained in the open position by a separate hydraulic system so that the piston pumps fluid back through the inlet port and by-passes the outlet port. The separate hydraulic system includes a three-way solenoid control valve which directs fluid to the intake valve to open the valve. The control valve may contain a pair of solenoids which latch an internal spool to control the flow of fluid to the intake valve. The spool can be latched into position by a digital pulse that is provided by an electrical controller. The controller can control the output pressure of the pump by opening the intake valve and by-passing the outlet port.
REFERENCES:
patent: 3225785 (1965-12-01), Goike
patent: 4389167 (1983-06-01), Farr
patent: 5456581 (1995-10-01), Jokela et al.
patent: 5577892 (1996-11-01), Schittler et al.
Freay Charles G.
Sturman Industries
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