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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.
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
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Temperature
limits: -40° to 350° F (-40° to 175° 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.
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Available
Materials of Construction
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Housing: Cast iron, stainless steel,
aluminum, nickel-plated cast iron, epoxy coated cast iron, nylon
coated cast iron
Resilient Seat: EPDM, Buna-N, polyurethane, fluoroelastomer, FDA silicone, FDA white Buna-N, FDA white EPDM, FDA white fluoroelastomer
Disc: Cast iron, 316 stainless
steel (satin or polished), molded nylon. PTFE, nickel and nylon
coating available
Disc Screws: Carbon steel, stainless
steel
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Bearings: Nylon, bronze
Shaft: Zinc-plated carbon steel,
316 stainless steel
Shaft Seal: Buna-N, fluoroelastomer
Housing Gasket: Buna-N (Series 486, 487,
488)
Retaining Ring: Carbon steel, stainless
steel
Housing Bolts: Carbon steel, stainless
steel
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Inflatable Seated Butterfly Valves
Series 485, 486, 487, 488
Bulletin - English
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Series 485, 486, 487, 488
Bulletin - Chinese
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Vannes Papillon à Siège Gonflable
Séries 485, 486, 487, 488
Bulletin - French
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Drehklappen mit
Blähmanschette
Serie 485, 486, 487, 488
Bulletin - German
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Valvole a farfalla con guarnizione gonfiabile
Serie 485, 486, 487, 488
Bulletin - Italian
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Series 485, 486, 487, 488
Bulletin - Japanese
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Zawory Motylkowe Uszczelniane Pneumatycznie
Seria 485, 486, 487, 488
Bulletin - Polish
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Vávula Borboleta com Sede Inflável
Séries 485, 486, 487, 488
Bulletin - Portuguese
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Válvulas de Mariposa con Asiento Inflable
Series 485, 486, 487, 488
Bulletin - Spanish
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