Reasons for high torque in high-temperature graphite sealed ball valves
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High-temperature graphite sealed ball valve: what causes high torque?
The torque of ball valves is primarily manifested at the valve seat and the ball, as well as at the valve stem and the packing. A high torque level is definitely due to insufficient smoothness; the valve seat should be ground, and the surface where the valve stem meets the packing needs to have its smoothness improved