Feedback controlled hydraulic valve system

Details Feedback controlled hydraulic valve system Feedback controlled hydraulic valve system

1984-12-24

1986-07-08

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Both inlet and exhaust controlled by motive fluid pressure...

91459, 91461, 13762564, F15B 1110

Patent

active

045986266

ABSTRACT:
A hydraulic system in which a pilot operated hydraulic four-way main valve (11) controls the direction and rate of fluid flow to a hydraulic load (13), includes a flow sensor (15) which is capable of operating bidirectionally and may therefore be located in one of the service lines (25, 26) from the main valve (11) to the load (13). The main components of the flow sensor are a variable or fixed aperture flow sensing orifice (52, 53), and a pressure transducer (18) to which the pressure differential developed across the orifice is applied and which converts the pressure differential into an electric negative feedback signal. This electric feedback signal is compared in an electronic circuit (17) with a demand signal, and a corresponding command signal sets the pilot valve (12) which controls the main valve (11). The pressure transducer (18) in the described embodiment is a cantilever beam pressure transducer (36), acted on by the inner ends of a pair of diameter-matched sliding pins (34, 35), across the outer ends of which the pressure differential is applied.

REFERENCES:
patent: 862867 (1907-08-01), Eggleston
patent: 2867757 (1959-01-01), Wagner
patent: 2920487 (1960-01-01), Green
patent: 3763746 (1973-10-01), Walters
patent: 3878765 (1975-04-01), Walters et al.
patent: 4031813 (1977-06-01), Walters et al.

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