The discharge valve is mainly used for discharging materials at the bottom of the storage tank, reaction kettle, and other vessels. The valve is connected with the equipment and located at the bottom by flange or butt welding, so as to eliminate the residual phenomenon of the process medium usually at the outlet of the vessel. According to the needs of the actual situation, it is divided into upward and downward exhibition types. The Upward type is used for discharging the reactor with the agitator discharging valve; the downward type is used for the reaction kettle discharging of the frame-type anchor agitator.