Inflatable Seated Butterfly Valves. Series 485, 486, 487, 488. ANSI and Metric Flange Compatible. Less friction, low torque, less wear, longer life. Posi-flate's unique butterfly valve design uses air pressure to expand the seat against the disc, providing even pressure distribution for a bubble-tight seal, every time. Because the seat makes only casual contact with the disc during valve opening and closing, there is very minimal disc impingement. This is in contrast to conventional butterfly valves where disc impingement leads to shaving of the seat, decreasing the overall performance and valve life. Substantially less torque is required to open and close the Posi-flate butterfly valve, thus a smaller actuator can be used resulting in lower overall valve cost.
In actual comparison tests and documented field applications, the Posi-flate butterfly valve outperformed all other valves. In fact, a Posi-flate valve life of one to three million cycles, even in extremely abrasive applications, is not uncommon. For dry solids, gases and slurry applications, the Posi-flate inflatable seated butterfly valve is unsurpassed. Standard valve sizes range from 2" (50 mm) to 30”" (800 mm) and fit both ANSI and metric flanges. A full line of actuators, limit switches and controls are available to suit individual applications.
- Inflatable seat compensates for disc and seat wear
- Longer valve life
- Minimal seat wear
- No disc impingement
- Ultra-low torque requirements
- Lower actuator costs
- More seal contact area
- Proven excellent for abrasive and dry solids
- Disc designed to prevent material build-up
- Double shaft seals
- Multiple bearings
- Fail-safe monitoring
Temperature limits: -40° to 300° F (-40° to 150° C), varies with application and materials of construction.
Air supply: 115 PSIG (7.9 bar) maximum to seat, varies with application.
Working pressure: Full vacuum to 100 PSIG (6.9 bar), varies with materials of construction.
Operating torque: Varies with application.