Fluid handling – Convertible
Reexamination Certificate
2005-04-05
2005-04-05
Michalsky, Gerald A. (Department: 3753)
Fluid handling
Convertible
C091S446000, C137S596000
Reexamination Certificate
active
06874526
ABSTRACT:
A hydraulic control device (10, 90) for load pressure-independent control of a double-acting motor, in which by replacing the pressure balance regulator throttle slide valve element (68, 93) but using the same housing (13), the control device can be converted from a directional-control valve (11) with a primary individual pressure balance regulator (12) for load pressure-independent control to a directional-control valve (91) with a secondary individual pressure balance regulator (92) for an oil flow distribution in the event of undersupply. To this end, in a second longitudinal bore (41) containing the control pressure opening (68, 93), the housing (13) has three axially spaced infeeds of control pressure openings (51, 52, 53), which can be activated differently through interchangeable installation of a sealing plug (66) and a stopper (67) and, together with the respective throttle slide valve element, constitute a primary pressure balance regulator (12) or a secondary pressure balance regulator (92). The control device (10, 90) can be inexpensively produced for different functions using the same housing (13).
REFERENCES:
patent: 4176521 (1979-12-01), Budzich
patent: 4519419 (1985-05-01), Petro
patent: 19 44 822 (1970-03-01), None
patent: 36 03 811 (1987-08-01), None
patent: 36 34 728 (1988-04-01), None
patent: 0 877 169 (1998-11-01), None
Michalsky Gerald A.
Robert & Bosch GmbH
Striker Michael J.
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