Tank bottom valve of bioreactor

The utility model provides a tank bottom valve of a bioreactor, which is composed of a position-limiting device, a valve cover, a guide key, a valve body, a film head valve core, a cleaning opening, a valve seat, a sealing ring, a discharging opening, a hoop, a valve rod and a handle. The outer wall at the lower end of the valve body is tapered, and the outer wall at the upper end of the valve cover is tapered; the hoop is sheathed at the outer side of the tapered protruding part at the lower end of the valve body and the upper end of the valve cover, and the film head valve core is arranged in a valve cavity; and the discharging opening and the cleaning opening are arranged in the valve cavity. The film head valve core adopts the upper jacking-in type, the driving of the valve rod is driven by the handle, the film head valve core is sealed with the top part of the valve cavity in a conical face manner, and the position-limiting device prevents the film head valve core from being damaged due to the over screw