The sectional shut-off device is a two - segment shut-off valve. The first segment closes for fast closure, and the second segment is slow down. The utility model is installed on the oil circuit between the governor and the guide vane servomotor, and prevents the water hammer accident by controlling the closing speed of the relay, and ensures the safe and reliable operation of the water turbine generator set.

• Good sealing performance
• With fine adjustment mechanism
• Time adjustment is convenient and accurate
• Affect closing time only
• The corresponding speed is fast and the inflection point is accurate