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| Standard or Nonstandard： | Standard |
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Trunnion Mounted ball Valve is one of the major types related to the ball valve. Compared to the other major type named the floating ball valve, Trunnion Mounted ball Valve is often preferred as it has a distinctive lower operating torque than the floating ball valve since pressure forces tending to push the ball downstream are supported by a trunnion rather than the valve seat.
Trunnion Mounted ball valve is fixed, so that it does not move within medium pressure. Trunnion ball valve usually has floating seats. The seats move within the medium pressure to tight the ball and seal ring to ensure sealing reliability. Bearings could be mounted in top shaft and bottom shaft, which reduces operation torque. This is widely used in valves that can endure high pressure. To decrease the operation torque and increase sealing reliability, lubricated ball valves are adopted in recent years.
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