Clean in place diaphragm valve

Abstract

A clean in place diaphragm valve is disclosed including a valve body portion having a fluid inlet and a fluid outlet in fluid communication with a valve chamber, the valve body portion including a dished interior, valve chamber surface in which the fluid outlet is disposed; an annular wall member surrounding the fluid inlet within the valve chamber, having a first diaphragm seating surface adapted to maintain the fluid inlet and the fluid outlet in fluid separation when a diaphragm is sealed against the first diaphragm seating surface to close the valve; a second diaphragm seating surface on the valve body portion surrounding the fluid inlet and the fluid outlet; a flexible diaphragm disposed over the valve chamber to define the valve chamber between an inner surface of the diaphragm and an interior surface of the valve body portion; a bonnet disposed to compress the diaphragm against the second diaphragm seating surface; a clamp for maintaining the diaphragm in sealing engagement against the second diaphragm seating surface; and a valve stem for forcing a portion of the diaphragm into sealing engagement against the first diaphragm seating surface to achieve a valve closed position.