Adjustable relief valve arrangement for a motor vehicle power st

Details Adjustable relief valve arrangement for a motor vehicle power st Adjustable relief valve arrangement for a motor vehicle power st

1996-11-12

1997-07-29

Thorpe, Timothy

Pumps

With condition responsive pumped fluid control

Fluid flow rate responsive

417307, 417311, 417440, F04B 4922

Patent

active

056516657

ABSTRACT:
A hydraulic pump having a flow control valve for recirculating a fraction of the discharge of a rotating group of the pump and an externally adjustable pressure relief valve. The flow control valve includes a cylindrical bore in a housing of the pump, a discharge passage intersecting the bore, a recirculation passage intersecting the bore, and a valve spool slideable in the bore. A valve body on the housing closes an open end of the cylindrical bore and cooperates with the valve spool in defining a spring chamber connected to the discharge passage. A spring in the spring chamber biases the valve spool to a position corresponding to zero recirculation. The relief valve includes a stepped bore in the valve body, a valve seat in the stepped bore, a valve element, a spring biasing the valve element against the valve seat, and a spherical metal spring seat interference fitted in the stepped bore. The spherical spring seat is plunged into the stepped bore while the pump is operating to compress the relief valve spring until a reaction force of the relief valve spring on the relief valve element induces a preselected pump relief pressure.

REFERENCES:
patent: 2996013 (1961-08-01), Thompson et al.
patent: 3200752 (1965-08-01), Clark et al.
patent: 3207077 (1965-09-01), Ziegler et al.
patent: 3385220 (1968-05-01), Dymond
patent: 3656870 (1972-04-01), Kusakabe et al.
patent: 4251193 (1981-02-01), Minnis et al.
patent: 4386891 (1983-06-01), Riefel et al.

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