Magnetic detent for a control valve

Details Magnetic detent for a control valve Magnetic detent for a control valve

1981-05-06

1982-05-11

Spiegel, H. Jay

Valves and valve actuation

With friction detent

F16K 3504

Patent

active

043289509

ABSTRACT:
A magnetic detent housed in an end cap adapted for mounting to a hydaulic control valve having a reciprocally actuated spool movable from a neutral to a detented position. The magnetic detent including a spool extension formed with a detent groove and slidably supported in a retainer mounting a plurality of radially movable balls. A centering spring exerting a biasing force for urging the extension to the neutral position. A clapper movably mounted on and in driving contact with the balls and spaced from a magnet member generating a magnetic force. A spring member exerting a relatively light pre-load force for urging the balls against the periphery of the extension and driving the clapper into magnetically held contact with the magnet member. The pre-load and magnetic forces combining to form a detenting force locking the balls against the biasing force of the centering spring. The biasing and pre-load forces combining to form a shifting force resisting movement of the extension from the neutral position.

REFERENCES:
patent: 2632821 (1953-03-01), Wright et al.
patent: 2836194 (1958-05-01), Tjaden
patent: 3326236 (1967-06-01), Beckett et al.
patent: 3438399 (1969-04-01), Barnes et al.
patent: 3645226 (1972-02-01), Mays et al.
patent: 3667723 (1972-06-01), Schneider
patent: 3790129 (1974-02-01), Pauls
patent: 3899003 (1975-08-01), Tirelli
patent: 3942485 (1976-03-01), Suda et al.
patent: 4195551 (1980-04-01), Schmiel

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