How to reduce the centerline butterfly valve torque?
How to reduce the centerline butterfly valve torque?
(OP)
The friction force at the EPDM liner/disc interface results in higher torque. How to reduce the torque? Please give your advice. Thanks





RE: How to reduce the centerline butterfly valve torque?
Triple offset valves would offer the same advantage, but they usually require a very high seating torque to achieve tight shutoff.
If for some reason you >MUST< use a lined valve, there are "undercut" valves with the O.D. of the disc reduced several thousandths. These have reduced torque but are primarily offered for reduced scrubbing of the disc-edge against the liner in abrasive services.
RE: How to reduce the centerline butterfly valve torque?