Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
How to reduce the centerline butterfly valve torque?
- Thread starter bao2ye
- Start date
Use a high-performance (double-offset) valve. Once it rotates 2-3 degrees, the vane is clear of the seat so there is no torque due to seat friction. Also the offset(S) are in the direction that reduces the dynamic 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.
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.
- Thread starter
- #3
- Status
Similar threads
- Question