Valves and valve actuation – Tube compressors
Patent
1996-10-23
1998-01-13
Fox, John
Valves and valve actuation
Tube compressors
251 9, F16K 122
Patent
active
057070385
ABSTRACT:
A two-way flexible valve to control or interrupt the flow of a pressurized medium. The valve is a polymeric semi-rigid tubing hyperflexed until its material has yielded in an irreversible manner and created a kink. Ulterior flexions of the tubing tend to occur about the preferred axis set by the kink. An acute angle closes the valve by crimping the lumen shut, whereas an obtuse angle opens it in some proportion of the angle. One end of the kinked valve tubing is held on a support and the other end is fastened to a lever hinged on pivot pins. The distance between holding points and the valve kink is several times the diameter of the valve tubing, and the axis of the kink is collinear with that of the hinge, both factors reducing sideload stress in the valve material, increasing its lifespan. An elastic member holds the valve closed and a flexible actuating line acting against the elastic member opens the valve in some proportion of its pull. A three-way valve embodiment is detailed for the control of pneumatic actuators of a walking robot.
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