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Closing torque for a butter fly valve
- Thread starter Engr777
- Start date
cranekiran
Mechanical
Dear Tahir,
First you should calculate the total torque adding the 3 torque values.
1)Seal friction torque:- This depends on the Torque due to the friction between the Disc seal & the inner dia. of body.
2)Bearing Friction Torque:- The torque exerted due to the bearings inside the shaft bore.it depends on the shaft dia.& the bearing friction coeff.
3)Hydrodynamic Torque:- The torque due to the load on the Disc by the Media.Due to opening & closing of Disc.
After the Torque value is determined you have to multiply the torque by a safety factor of 1.3 to 1.5 to select the operator.
The details you have given is not clear but I guess you may select a rubber seated valve with a rated pressure of 5-10 bars.
The valve selection also depends on varius other factors such as already discussed in thread408-27432
Hope this Info. helps you.
Cheers!
First you should calculate the total torque adding the 3 torque values.
1)Seal friction torque:- This depends on the Torque due to the friction between the Disc seal & the inner dia. of body.
2)Bearing Friction Torque:- The torque exerted due to the bearings inside the shaft bore.it depends on the shaft dia.& the bearing friction coeff.
3)Hydrodynamic Torque:- The torque due to the load on the Disc by the Media.Due to opening & closing of Disc.
After the Torque value is determined you have to multiply the torque by a safety factor of 1.3 to 1.5 to select the operator.
The details you have given is not clear but I guess you may select a rubber seated valve with a rated pressure of 5-10 bars.
The valve selection also depends on varius other factors such as already discussed in thread408-27432
Hope this Info. helps you.
Cheers!
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