Patent ID: 7118090
Filing Date: 2006-10-10
Classification: F16K

Abstract:
1. A shut-off valve assembly comprising: a hollow valve body having a first opening and a second opening; a valve seat positioned within the hollow valve body proximate to the first opening; a first diaphragm assembly, wherein a deflectable portion of the first diaphragm assembly is attached to an interior surface of the hollow valve body forming a first volume between the valve seat and the first diaphragm assembly; wherein the first diaphragm assembly comprises a sleeve portion, and the sleeve portion comprises an open end and a length; a second diaphragm attached to another portion of the interior of the hollow valve body and attached to the first diaphragm assembly such that a second volume is defined between the second diaphragm and the second opening, wherein a third volume is formed between the first diaphragm assembly and the second diaphragm, the third volume sealed from the first volume and the second volume by the first diaphragm assembly and the second diaphragm; at least one flow hole formed in the first diaphragm assembly, wherein the at least one flow hole allows a process flow to flow between the first volume and the second volume; and a self-aligning head assembly comprising; wherein a deflection of the deflectable portion of the first diaphragm assembly and the second diaphragm allows the other portion of first diaphragm assembly to move in order to open and close the valve head from the valve seat.