Drain ball valve

The utility model discloses a drain ball valve which comprises a shell. The interior of the shell is of the structure of a cavity, connectors communicated with the cavity are formed in the two sides of the shell, an insertion opening communicated with the cavity is formed in the top of the shell, a valve body is arranged in the cavity and detachably connected with a valve rod, and the valve rod vertically penetrates through the insertion opening and is in contact with the valve body. The valve body comprises a valve ball, valve seats and a diaphragm spring, the valve seats are arranged on the two sides of the valve ball, a second valve seat is arranged between one side of the ball valve and the corresponding valve seat, the diaphragm spring is arranged between the corresponding valve seat and the second valve seat, a clamp spring is arranged on the outer sides of the valve seats and fixed to the cavity, a groove is formed in the top of the valve ball, the valve rod is fixed in the groove, an annular collar is arranged on the part, in the cavity, of the bottom of the valve rod, pin holes are formed in the corresponding positions on the annular collar and the valve rod, a pin rod penetrates through the pin holes and fixes the annular collar and the valve rod, a concave table is arranged at the part, below an insertion hole, of the top of the cavity, and the annular collar is fixed in the concave table. The stability in the using process is increased, and the service life is prolonged.