Signal valve for pressure compensated system

Motors: expansible chamber type – With motive fluid valve – Plural separately controlled waste passages for single...

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91452, 91468, F15B 1364

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active

047277939

ABSTRACT:
A signal valve (38) is connected to a supply conduit (16) connecting a pump (11) with a control valve (14) for transmitting an artificial load signal to a load signal chamber (34) of a pressure compensated unloader valve (27) when the control valve is at an operating position and the pressure in the supply conduit (16) is below a preselected value. This moves a valve member (31) of the unloader valve (27) to a blocking position causing essentially full pump flow to be directed to the hydraulic jack for decreasing the response time in situations wherein the hydraulic jack has cavitated and no positive load pressure signal is present.

REFERENCES:
patent: 2789542 (1957-04-01), Vander Kaay
patent: 3025717 (1962-03-01), Christenson
patent: 3088283 (1963-05-01), Furia et al.
patent: 3411416 (1968-11-01), Herd et al.
patent: 3948146 (1976-04-01), Maurer et al.
patent: 3971216 (1976-07-01), Miller
patent: 4163412 (1979-08-01), Porter
patent: 4176685 (1979-12-01), Hoefer et al.
patent: 4206688 (1980-06-01), Haak et al.

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