Valve device for a control cylinder

Details Valve device for a control cylinder Valve device for a control cylinder

2005-02-08

2005-02-08

Lazo, Thomas E. (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

With fluid pressure holding means for valve

C091S442000, C091S449000

Reexamination Certificate

active

06851350

ABSTRACT:
For a valve arrangement of a pneumatically actuated, spring-loaded control cylinder, a non-return valve in pneumatic communication with the control cylinder piston chamber. At very low backpressures in the control cylinder piston chamber caused by leaks of the valve responsible for pressurization of the piston chamber, the chamber is vented by passage of a very small air stream via the non-return valve. In this way, leaks cannot cause a very slow pressure buildup in the control cylinder piston chamber, followed at some time by undesired shifting of the control cylinder. In contrast, in the case of normal pressure buildup, i.e., during switching of the pressurizing valve, the non-return valve is promptly closed and the pressure in the control cylinder piston chamber is not influenced.

REFERENCES:
patent: 4741247 (1988-05-01), Glomeau et al.
patent: 4830046 (1989-05-01), Holt
patent: 5035312 (1991-07-01), Asayama et al.
patent: 5209153 (1993-05-01), Araki et al.
patent: 5313873 (1994-05-01), Gall et al.
patent: 5315873 (1994-05-01), Jin
patent: 5613518 (1997-03-01), Rakieski
patent: 6244410 (2001-06-01), Bauer
patent: 415 306 (1966-06-01), None
patent: 0 512 690 (1992-11-01), None

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