API 6D Ball Valve, Dbb, ASTM A105, 16 Inch, 3PC, 150-2500 LB

1. Double Block And Bleed (DBB) When the valve is closed and the middle cavity is emptied through the discharge valve, the upstream and downstream seats will independently block the fluid at the inlet and outlet to realize the double block function. Another function of the discharge device is that the valve seat can be checked if there is any leakage during the test. In addition, the deposits inside the body can be washed and discharged through the discharge device to reduce damage to the seat by impurities in the medium. 2. Low Operating Torque The trunnion pipeline ball valve adopts the trunnion ball structure and floating valve seat, so as to achieve lower torque under operating pressure. It uses self-lubricating PTFE and sliding bearing to reduce the friction coefficient to the lowest in conjunction with the high intensity and high fineness stem. 3. Emergency Sealing Device The ball valves with a diameter of more than or equal to 6″(DN150) are all designed with sealant injection devices on the stem and seat. When the seat ring or stem O ring is damaged due to an accident, the corresponding sealant can be injected by the sealant injection device to avoid medium leakage on the seat ring and stem. If necessary, the auxiliary sealing system can be used for washing and lubricating the seat to maintain its cleanliness. 4. Fireproof Structure Design In case of fire during the use of the valve, the seat ring, stem O ring and middle flange O ring made of PTFE, rubber or other non-metal materials will be decomposed or damaged under high temperature. Under the pressure of the medium, the ball valve will push the seat retainer rapidly towards the ball to make the metal seal ring contact the ball and form the auxiliary metal-to-metal sealing structure, which can effectively control valve leakage. The fireproof structure design of the trunnion pipeline ball valve conforms to requirements in API 607, API 6FA, BS 7655 and other standards.