Patent ID: 7770598
Filing Date: 2010-08-10
Classification: F16K,Y10T

Abstract:
1. A valve comprising: a housing having an inlet, an outlet and a movable sealing member allowing the inlet and the outlet to be connected in fluid communication with each other, the sealing member having associated therewith effective areas, pressure being applicable to the effective areas via fluid from the inlet, and sealing areas, and the sealing member further having associated therewith a sealing seat for sealing the inlet from the outlet, the sealing member having a conduit formed therein in the form of a Venturi nozzle or a Laval nozzle, the inlet and the outlet connectable in fluid communication with each other via the conduit when the sealing member rests on the sealing seat, and a sealing element for selectively blocking flow through the conduit wherein the sealing member has two springs, wherein the two springs include a first spring forcing the sealing member away from the sealing seat when a force of the fluid against the effective areas drops below a predetermined value and a second spring surrounding the first end of the sealing member forcing the sealing member towards the sealing seat and the first spring.