Each performance index of the hard seal ball valve with ordinary ball outside, also has high temperature resistance, wear resistance and double entry into, exit from the sealing function, of which two block is equipped with the outlet one-way sealing, the stainless steel spring to adjust the seat, the valve torque is more balanced, the valve in the high frequency, high temperature difference, high differential pressure condition, the switch performance and stability. Stop seal of ball face and cone face will be formed between the metal seal face since wedge composite ball is used, such seal is quite tight and zero leakage will be achieved in spite of the size of passage and pressure value, it can resist high-temperature, high-pressure and static electricity Inclined wedge composite ball is adopted, so rotation space between the sealing faces and little wearing is reserved accordingly, furthermore, even though there is wearing, the inclined wedge will…