Excessive Operation Torque Questions
- Gate Valves
- Globe Valves
- Ball Valves
- The valve operation torque is abnormally high.
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① If the packing retaining nut is tightened too tightly, the handle operation torque becomes too high.
Loosen the packing retaining nut while making sure that no leakage occurs.
Be sure to depressurize the inside of the valve before loosening the nut.② When the valve is installed to the pipe, apply an appropriate tool to the hexagonal piping connection port of the body located on the pipe side. The valve may be deformed when the valve body is clamped with a vice or pipe wrench for connecting to the pipe.
③ The pipe or fitting ends may hit the wall on the back of the body seat if they are excessively inserted to the valve bore. Such an installation may deform the body seat.
Copper materials are weaker in mechanical strength than steels, so if steel fittings are overly tightened into the bore of copper valve, this may deform the valve body.
When steel fittings are threaded into the copper valve bore, refer to the tightening torques shown in the table below before performing the work.
Applicable product