The main design parameters Size: DN15 ~ 100 mm Pressure: PN16.0 ~ 32.0 MPa Connection: flange, JB/T 2769-92, ANSI B16.5, welding: GB12224-89 Working temperature: - 28 ~ 120 ℃, - 28 ~ 180 ℃ Seal cooperates: seal: denier Lin/polyethylene imine/reinforced ptfe Sphere: 2 cr13 chrome plated nickel (or) This valve parts are forgings, soft sealing ring set into the steel ring, steel also work out sealing surface, radial steel seat and the back are equipped with "O" type circle, nothing more than to ensure that the medium leakage, the valve stem designs for the bottoms, shoulder has thrust bearing, to reduce operating torque. Once the fire protection function: soft sealing have been burned, due to the medium pressure the ball into the steel.To prevent leakage of medium.