Discharge valve, mainly used for reactor, storage tank and other containers at the bottom of the discharge, with the help of the valve bottom flange connected to the bottom of the tank and other containers, so eliminate the process medium usually in the container outlet residual phenomenon. According to the needs of the actual situation, the discharge valve can be divided into discharge ball valve and up and down expansion discharge valve, among which the discharge ball valve can be divided into diagonal discharge valve and flat discharge valve. This product work and medium contact place are lined with corrosion resistant fluorine plastics, products can withstand in addition to "molten alkali metal and fluorine" any corrosive media, in chemical industry, petroleum, medicine, food, iron and steel smelting, paper, water and electricity, environmental assurance and other industries are widely used. Various operation modes, such as: manual, pneumatic, electric, etc.