A check valve, the pump comprising a check valve

The check valve includes a cylindrical valve seat frame, a valve seat having a flow hole with the operation fluid flows is secured to the valve seat frame, the valve seat In the outflow side of working fluid of the valve seat and a valve body for opening and closing the by the valve seat and the valve seat frame and said valve body are unitized together, the structure is simple, the assembling property is good, it can be realized cost reduction . Further, by providing the check valve mentioned above, compact, it is possible to provide a high-performance pump durability and excellent.