| 摘要 |
PROBLEM TO BE SOLVED: To provide a diaphragm valve for obtaining a prescribed diaphragm characteristic, and stably obtaining opening-closing performance of the valve by prescribed restoring force. SOLUTION: In this diaphragm valve, a peripheral edge part 9a of a diaphragm 9 is sandwiched by a body 1 and a diaphragm presser 10, the diaphragm is allowed to abut to a valve seat 7 by a load means, the valve seat is opened by resiliency of the diaphragm itself by releasing the load means, and the peripheral edge part 9a of the diaphragm sandwiches the outer peripheral side and the inner peripheral side of an annular projection of the diaphragm peripheral edge part 9a by an annular projection 12 formed on the body 1 or the diaphragm presser 10, and an annular groove 13 formed on the diaphragm presser 10 or the body 1 on the opposite side of a position corresponding to the annular projection.
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