Patent ID: 7654283

Claim:
A check valve for regulating flow within a passage defined in a chamber body comprising: a tubular valve seat frame including a through-hole, the tubular valve seat frame coupled to the chamber body so that the through-hole is in fluid communication with the passage; a valve seat received in the through-hole, the valve seat fixedly secured to an inside of said valve seat frame, said valve seat having a communication hole through which a working fluid flows; and a valve body having a fixing part that is coupled to the valve seat frame to be disposed on a working fluid outflow side of said valve seat, wherein said valve seat frame, said valve seat, and said valve body are formed into one unit to be coupled as the one unit to the chamber body; said valve body further including an opening-closing part that selectively opens and closes the communication hole, wherein the fixing part and the opening-closing part are partially separated by a slit, the opening-closing part being wider than the communication hole so that the opening-closing part selectively seats against an entire periphery of the communication hole, the fixing part of the valve body being continuous to completely surround the opening-closing part, and the fixing part overlapping both the valve seat frame and the valve seat.