Low-loss cyclically-operating pressure-responsive bypass valve f

Details Low-loss cyclically-operating pressure-responsive bypass valve f Low-loss cyclically-operating pressure-responsive bypass valve f

1987-07-27

1990-02-06

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

91468, 137116, 417307, F15B 1102, F15B 1302

Patent

active

048979961

ABSTRACT:
In a system for varying the output flow from a constant rate feed pump with low losses by chopping the said output flow into one flow fraction supplied to the load as a power flow and into another flow fraction returned as a pressureless flow, the loads are aperiodically supplied with proportionated amounts of fluid by chopping, the respective amounts of fluid and the chop frequency being inherently controlled in way dependent on the instantaneous requirement of the load in the system. The system for performing the method has a housing with a number of pressure spaces arranged to be acted upon by different flows and with one or more pressureless spaces, a piston with a piston rod arranged in a piston space, a compression spring preferably arranged in a hole in said piston rod and adapted to act against the sum of the hydraulic forces acting on the piston and spool. The method is applicable to complex hydraulic systems and more especially to hydrostatic drives.

REFERENCES:
patent: 2406899 (1946-09-01), Pugh et al.
patent: 2545712 (1931-03-01), Stevenson
patent: 3718373 (1973-02-01), Hofer
patent: 3845776 (1974-11-01), Ueda
patent: 3971397 (1976-07-01), Staisch
patent: 3973581 (1976-08-01), Chiba
patent: 4010610 (1977-03-01), Dunn
patent: 4173866 (1979-11-01), Farr
patent: 4302937 (1981-12-01), Aubert
patent: 4503876 (1985-03-01), Farr
patent: 4644748 (1987-02-01), Goss et al.
patent: 4711155 (1987-12-01), Brunner

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