| 摘要 |
<p>A diaphragm valve (1) where an air-tight space is formed, by a diaphragm valve body (20), in an opening section in the upper surface of a body (10), an urging force of an urging member (33) presses the diaphragm valve body to a valve seat (13), closing the valve, and an actuator (31) causes the diaphragm valve body to be separated from the valve seat, opening the valve. The structure reduces a load necessary to bring a diaphragm valve body into contact with a valve seat and prevents water hammer. The diaphragm valve body (20) has a valve body section (21) coming into contact with the valve seat (13), a diaphragm section (22) expanding outward from the valve body section (21), and a stationary section (23) formed on the peripheral edge of the diaphragm section. A root section (25) of the diaphragm section (22) formed on the valve body section (21) is positioned inside the diameter of the valve seat (13). The stationary section (23) on the diaphragm section (22) peripheral edge curved and expanded is fixed at a position that is higher than the root of the stationary section when the valve is closed.</p> |
