... device. Each seat of the ball valve can separately cut off the medium at both inlet and outlet of the valve to realize ... abnormal pressurization in the chamber. Fireproof and anti-static design, the valve stem and the valve seat are equipped with an injection system. ... .34, API 608, AP 6D, BS 5351Temperature: -196℃-540℃Seat material: PTFE, RPTFE, NYLON, DEVLON, PEEK, PPL, Metal hard seatConnection: ...