
A fluid controller (1), having a valve body (4) having flow paths used as inlet and outlet for a bonnet (5), and an operating mechanism (7) moving the diaphragm in vertical direction, wherein the flow paths of the valve body communicates with each other through a protrusion-free communication path (8), the diaphragm is fitted closely to the communication path when lowered so as to close the flow path and, when raised, the center part of the diaphragm is recessed and its part near the outer perip...











