Fluid handling – Systems – Plural noncommunicating flow paths
Patent
1981-02-13
1984-05-29
Nilson, Robert G.
Fluid handling
Systems
Plural noncommunicating flow paths
251 5, 251 7, F16K 31126
Patent
active
044508620
ABSTRACT:
A pinch valve assembly is described for location between the manifold assembly and the flow adjustment valves of a dental handpiece system. The pinch valve assembly of the present invention comprises a housing having a plurality of passageways extending therethrough for receiving a plurality of resilient tubes therein. A plurality of transverse slots extending from each of the passageways to the bottom of the housing are provided and are adapted to receive a plurality of slide elements in each of the slots such that the slide elements can move reciprocally within the slots. The housing is supported on a base and a flexible diaphragm is located between the housing and the base. A rigid disc rests on the diaphragm and supports the slide elements in the slots. A chamber is provided in the base beneath the diaphragm and connected to a source of pressurized fluid. Expansion of the diaphragm forces the rigid disc and the slide elements within their respective slots to move upwardly causing the slide elements to move against the resilient tubing in the passageways in the housing. When the slide elements are pushed against the tubing, the tubing is pinched or crimped against the top section of the housing, thereby shuttng off fluid flow through the resilient tubes. Upon deactivation, the fluid pressure within the chamber in the base is bled off permitting the diaphragm to revert to its rest position, lowering the rigid disc and the slide elements. That movement frees the tubes within the housing such that fluid flow can occur therethrough.
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IBM Technical Disclosure Bulletin; vol. 10, No. 4; Published Sep. 1967.
Dhuey John A.
Lowin David A.
Nilson Robert G.
Syntex (U.S.A.) Inc.
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