Abstract: A diaphragm valve includes an outer wall section for valve seat mounting provided in a primary-side opening section, a stepped section provided on the inner periphery of the outer wall section, a seat ring press-fitted into and fixed to the stepped section, a flange section provided in the seat ring, and a press-fitting groove for valve seat mounting configured with a space between the seat ring and the outer wall section and the flange section, in which a valve seat press-fitted into and fixed to the press-fitting groove has an upper portion slightly protruding in a state where an extension section covers a position in the vicinity of a top portion of the outer wall section and an extension section the inner periphery of which is decreased in the upper portion of the valve seat covers a position in the vicinity of a top portion of the seat ring.

Abstract: An attachment structure for an actuator-specific solenoid valve and an actuator-quipped valve. The attachment structure can be easily applied to or released from any actuator and a solenoid valve, and the solenoid valve can be easily attached to and removed from any position in a side-surface circumferential direction without impairing compactability of the actuator. The attachment structure for an actuator-specific solenoid valve includes a base body provided on a lower part of a cylindrical actuator and an attachment member removably attachable externally from a main body of the actuator, the attachment member having a fixing part formed as being extended at a position close to a side surface of the main body of the actuator and a solenoid valve for fluid control attached to the fixing part, and the attachment member fixing the solenoid valve being provided rotatably about a side surface of the main body of the actuator.

Abstract: An attachment structure for an actuator-specific solenoid valve and an actuator-quipped valve. The attachment structure can be easily applied to or released from any actuator and a solenoid valve, and the solenoid valve can be easily attached to and removed from any position in a side-surface circumferential direction without impairing compactability of the actuator. The attachment structure for an actuator-specific solenoid valve includes a base body provided on a lower part of a cylindrical actuator and an attachment member removably attachable externally from a main body of the actuator, the attachment member having a fixing part formed as being extended at a position close to a side surface of the main body of the actuator and a solenoid valve for fluid control attached to the fixing part, and the attachment member fixing the solenoid valve being provided rotatably about a side surface of the main body of the actuator.