Patent ID: 6505814
Filing Date: 2003-01-14
Classification: F16K,Y10T

Abstract:
A fluid controller (1), comprising:a valve body (4) having flow paths used as inlet and outlet for fluid; a diaphragm (6) held fixedly between the valve body and a bonnet (5); and an operation mechanism (7) moving the diaphragm in a vertical direction, wherein said flow paths of the valve body communicate with each other through a communication path (8) and that does not have any protrusions and that is not curved at a valve base, said 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 periphery part is protruded, a curved surface (52) to which an outer upper surface (63) of said protruded part is closely fitted is formed on said bonnet at the inner lower surface of a diaphragm holding part (51), the diaphragm having double layered structure comprising a lower part diaphragm (61) which a tip of hanging lug (11) is buried and an upper part diaphragm (62) sticking to an upper surface of the lower part diaphragm, and annular ridges, which comprise an outside annular ridge (66) and inside annular ridge (64) near the periphery part of the lower part diaphragm; and a lower longitudinal ridge (65) which runs inside the inside annular ridge (64) longitudinally; said annular ridges ridged in both the upper and lower directions, an outer periphery part of the upper part diaphragm being inside more than an inner surface of the outside annular ridge.