Patent ID: 7232106
Filing Date: 2007-06-19
Classification: F16K

Abstract:
1. A fluid flow control valve comprising: a valve body having an inlet and an outlet; a valve opening in the valve body; a valve closure member cooperating with the valve opening, and oriented non-perpendicularly to such that there is fluid flow along a surface of the valve closure member when the valve is open; a pressure chamber; a sealing diaphragm connected between the valve closure member and the valve body to seal the pressure chamber and a mechanism for controlling the pressure in the pressure chamber, wherein the diaphragm includes: a first portion which is disposed substantially axially when the valve is closed; a second portion attached to the closure member that is disposed substantially radially when the valve is closed and a central opening through which the valve closure member extends toward the valve opening for engagement with the valve opening to close the valve; the second portion of the diaphragm being moveable with the closure member to cause the first portion to fold toward itself along the axis of movement of the closure member when the valve is opened.