Motors: expansible chamber type – Working member position feedback to motive fluid control – Fluid operated
Patent
1986-01-21
1986-11-18
Michalsky, Gerald A.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Fluid operated
91403, 91461, F15B 13042
Patent
active
046228837
ABSTRACT:
An apparatus for controlling the movement of a movable element as a working circuit (10) with a directional control valve (3) equipped to control devices (11, 12) which can be pressure activated in two directions. A control circuit (29) which can be connected to a fluid source (19) is used to activate the directional control valve for which the control circuit is connected to the two control devices and has an adjustable first choke (24) connected to one of the two control devices (12), a second choke (22) which is similarly adjustable and connectable to the same control device, and third and fourth adjustable chokes (27, 28) which are connectable to the other of the two control devices (11). The first and third chokes are connectable further to a storage tank (7) and the second and fourth chokes are further connectable to a pressure source. A proportioning pressure valve (45) can be connected to the other of the two control devices (11). The first and third chokes are connected to a pilot valve (38). To form a simple device with which the chokes connected in series as reference and current value elements, respectively, with as little line as possible, the proportioning pressure valve and the first and third chokes are separately connected to ports of the pilot valve. In one control position, the pilot valve interconnects the first and second chokes and connects the proportioning pressure valve to the third choke. In the other control position, the first and second chokes are interconnected through a fifth choke and the third and fourth chokes are connected directly. The proportioning pressure valve is designed as a leak-proof valve.
REFERENCES:
patent: 4510847 (1985-04-01), Mucheyer et al.
patent: 4574687 (1986-03-01), Kauss et al.
Farley Walter C.
Mannesmann-Rexroth GmbH
Michalsky Gerald A.
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