1. The metal-to-metal structural design at the body & cover ensures that the lining will not be squeezed or deformed by force

2. Integrated anti-blowout stem and ball design minimizes the risk of stem/ball failure due to wear damage

3. Steel parts with T-grooves and grooves, so that the lining is firmly locked, fully adapted to the vacuum environment

4. All flow parts are fully coated with permeable PFA material as an anti-corrosion barrier

5. Wider conical lining connection design, even in the case of extreme thermal cycling can maintain a complete seal, to meet the low escape standards