3. tight and reliable. ball valve seal material is plastic, reliable sealing, be widely used in a vacuum system.

4. easy installation, open and close fast. From full OPEN to full closed need rotate 90 degrees for easy remote control

5. maintenance convenient, simple structure. Seal is flexible and it's easy to remove.

6. Ball valve body and valve seat sealing surface is isolated while medium through, the seal isn't corrosion when full open or full close.

7. widely use, diameter from millimetre to metre and high vacuum and high pressure. ball valve has widely used in oil, chemical, power generation, pulp and paper, atomic energy, aviation, rocket and other departments, as well as in the people's daily lives