Importance

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Abstract

A check valve includes: a base member provided with an inlet channel along which fluid flows in one direction; a valve unit disposed on a valve mounting surface and including a film valve body and a frame body; and a valve seating surface defined on the valve mounting surface at the periphery of the opening of the inlet channel, wherein one or more communicating grooves are formed on the valve mounting surface across the frame body so as to extend from the valve seating surface to the outside of the frame body, wherein the inlet channel is blocked by the film valve body when the film valve body is in contact with the valve seating surface, and wherein the inlet channel and the outside of the frame body are communicated via the communicating grooves when the film valve body is separated from the valve seating surface.

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First Claim