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” (50mm) to 30” (750mm) and fit both ANSI and metric flanges. A full line of actuators, limit switches and controls are available to suit individual applications.

Performance Features
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.