Directional control valve for pneumatic cylinder

Details Directional control valve for pneumatic cylinder Directional control valve for pneumatic cylinder

1991-08-27

1992-07-21

Michalsky, Gerald A.

Motors: expansible chamber type

With motive fluid valve

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

91461, 91465, 13759616, F15B 13043

Patent

active

051313189

ABSTRACT:
A directional control valve for a pneumatic cylinder in which a piston of the cylinder can be lowered and elevated in a high speed with a minimum air consumption and the lowering/rising speed of the piston can be controlled before it reaches the upper/lower end portions to prevent bounding of the piston. The directional control valve includes a first pressure chamber communicating with an air supply, a second pressure chamber communicating with one of cylinder chambers divided by the piston of the cylinder, an exhaust pressure port, a pressure controlling mechanism, a pressure controlling and changing means which forms a pressure controlling chamber and a pressure receiving chamber, a first valve member for communicating the first pressure chamber and the second pressure chamber, a second valve member for communicating the second pressure chamber and an atmospheric pressure chamber, a third valve member for communicating the second pressure chamber and a pressure-receiving member, and a fourth valve member which is communicating with the third valve member, the air supply and a pressure control chamber.

REFERENCES:
patent: 2880708 (1959-04-01), Hayner
patent: 4071046 (1978-01-01), Cates
patent: 4425940 (1984-01-01), Cook
patent: 4531548 (1985-07-01), Gottling et al.
patent: 4638837 (1987-01-01), Buike et al.
patent: 4898203 (1990-02-01), Kobelt
patent: 4919168 (1990-04-01), Wagner

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