Integrated valve system

Details Integrated valve system Integrated valve system

2006-02-07

2006-02-07

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

C060S464000

Reexamination Certificate

active

06993904

ABSTRACT:
An integrated valve system (51) for use with a variable displacement hydrostatic pump (11), including a relief and check valve assembly (75) and a pressure override (POR) section, operable to communicate pressure above a predetermined POR setting from the high pressure side (15) of the HST closed loop to a stroking cylinder (29) to destroke the pump (11). A high pressure relief spring (83) determines the relief setting, and a POR compression spring (109) determines the POR setting, the relief spring and the POR spring being seated independently of each other, such that the POR setting may be adjusted without effecting the operation of the relief and check valve assembly (75).

REFERENCES:
patent: 4617797 (1986-10-01), Williams
patent: 4936095 (1990-06-01), Ross et al.

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