Special Features: The valve is welded in stainless steel and fine carbon steel, having double layers keeping temperature lining made in fire material. It also has the features of resistant to the high temperature, efficient in saving thermal energy, impact structure, easy to open and close and handy to operate. The valve's driving mode is part. Part driving device cannot be controlled and can be installed refer to the user's demand. Driving type is windlass elevating (open-close signal), electric actuator elevating (4~20mA current signal), electric hydraulic, electric draw stem elevating (open-close signal). Suitable temperature: 700, Suitable medium: High temperature gas including Smoke, air, gas with powder, etc