Importance

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Abstract

The valve includes a housing with inlet and outlet members joined by a resilient flexible valve closure. An annular chamber that does not communicate with the inlet or outlet surrounds the valve closure. When a flow of fluid is desired through the valve closure, a pressurized fluid is introduced into the annular chamber to deform the valve closure enabling the closure to open. Reduction or elimination of the pressure for deforming the valve closure permits the valve closure to assume its normal closed position, thereby permitting a shut off of fluid flow. Variable flow rates can be accomplished by obtaining predetermined deformations of the valve closure corresponding to predetermined levels of the pressurizing fluid which cause such deformation.

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First Claim