Detaching device of valve seat of water injection pump

The utility model relates to a detaching device of a valve seat of a water injection pump. The valve seat is mounted in a cylinder sleeve, the inner hole of the valve seat is conical, the lower part of an expansion block is inserted into the inner hole of the valve seat, the expansion block is mounted at the window of an expansion block seat, the upper part of the expansion block seat is fixedly connected with the lower part of a detaching rod, the detaching rod is sheathed outside an expansion rod, the lower part of the expansion rod is tapered, the inner wall of the lower part of the expansion block is in contact with the tapered lower part of the expansion rod, the detaching rod penetrates through a cross beam, the cross beam is placed into the upper port of the cylinder sleeve, a positioning rod is transversely mounted on the cross beam, a thread at the upper part of the detaching rod and a detaching nut are screwed down, the thread at the upper part of the expansion rod and an expansion nut are screwed d