VALVE DEVICE

原文（中国語）

A check valve for opening and closing an intake-side communication passage for fluid, includes a pump body including a partition wall in which the intake-side communication passage and a convex portion are formed, a valve body made of a flexible material, formed in a plate shape including an insertion hole, and configured to open and close the passage as being supported by the convex portion with the convex portion inserted into the insertion hole, and a push nut formed in a disk shape smaller than the valve body and including a hole into which the convex portion is inserted at a center part, and being locked to the convex portion locking the valve body to prevent the valve body from slipping off from the convex portion. An outer peripheral end part of the push nut being in contact with the valve body being formed in a curved surface shape.