1. When the medium stagnating in the cavity of the pipeline ball valve rises abnormally due to the temperature change, the medium pressure pushes the valve seat out of the sphere to achieve the effect of automatic pressure relief, and the valve seat automatically resets after pressure relief.

2. In case of fire or abnormal temperature rise, the valve operation is still reliable. At the same time, the valve seat and the ball form metal-to-metal contact, to achieve temporary sealing effect, to prevent further expansion of the fire, in line with API 6FA requirements.

3. Turn on the drainage device to check whether the valve seat is leaking or not, and also to discharge the cavity residue to reduce media pollution to the valve. The valve stem stuffing box can be replaced when the valve is in full or full operation.

4. In addition to the general seals, the special auxiliary sealing structure can play an emergency rescue role when the seal ring is damaged and leaked.

5. the valve stem seal adopts PTFE packing and O type rings, especially for gas medium. The high quality SF self lubrication bearing is adopted in the moving part of the valve stem, so that the friction coefficient is smaller and the operation torque is reduced.