Pressure operated valve systems
AssigneeRaymond International Inc.
InventorRichard K. Snow
Life of this patent
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Abstract
Fluid flow through a conduit is controlled by varying the pressure of the fluid. The fluid passes through a normally closed valve comprising a flexible sleeve held in pinched closed condition by an elastic material which is isolated from all pressures except those transmitted through the sleeve.
Claims10
A pressure responsive valve comprising a fluid conduit including along its length a flexible sleeve, a compressible elastic material surrounding said sleeve and holding its central region in a normally pinched closed condition, and a rigid outer casing surrounding said elastic material and isolating said elastic material from all pressure effects other than effects of fluid pressure applied through said sleeve from within said conduit, said rigid outer casing being permanently closed to prevent movement of said elastic material into or out from said casing.
A fluid material depositing system comprising a variable delivery pumping means, a conduit extending from the outlet of said pumping means, a pressure responsive valve interposed in said conduit, said valve including a flexible sleeve forming a portion of the length of said conduit, an elastic material surrounding said sleeve and holding its central region in a normally pinched closed condition and to hold said central region closed up to a predetermined threshold pressure, and a rigid outer casing surrounding said elastic material and isolating said elastic material from all pressure effect other than effects of fluid pressure applied through said sleeve from within said conduit, said rigid outer casing being permanently closed to prevent movement of said elastic material into and out from said casing, said pumping means being operable to vary the fluid pressure in the conduit incident on said valve above and below said threshold pressure.
Dependencies are inferred from the claim text.