Learn In Detail...
Proper Installation Techniques must be followed to prevent immediate or premature failure of Butterfly valve seat, disc or shaft on any size or make wafer-style Butterfly valves.
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| Pipework opened to allow free valve entry with the disc in a semi-closed position.
| Pipework not spread sufficiently - could tear rubber seat. Disc in open position will hit flange and score disc edge.
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| Valve in semi-closed position to (1) protect disc edge, (2) reduce rubber interference during installation and start-up, and (3) help reduce initial torque build-up.
| Disc as shown in fully closed position causes seat distortion. When flanges are drawn up, rubber will close around disc edge creating excessive torque in initial operation.
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| Disc should be turned to full open position after flange alignment and before evenly pulling up flange bolts.
| Incorrect pipe alignment will cause interference between disc edge and flange face creating leakage and excessive torque for opening valve.
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