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 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" (70mm) and fit both ANSI and metric flanges. A full line of actuators, limit switches and controls are available to suite individual applications.

1. ACTUATOR MOUNTING FLANGE: Flange is designed for direct actuator mounting.
2. RETAINING RING: Retaining ring simplifies bearing and seal removal and ensures positive bearing retention.
3. BEARINGS: Multiple bearings substantially reduce operating friction and torque requirements, eliminating any metal-to-metal contact, thus preventing shaft galling and freezing.
4. SHAFT SEALS: O-ring shaft seals insure positive sealing under the most adverse conditions.
5. SHAFT: Corrosion resistant, high strength steel shaft is easily replaceable.
6. SEAT O-RING SEAL: O-ring provides long lasting positive seal of seat inflation pressure.
7. MATERIAL SEAL: Land seal prevents material contamination of seat o-ring seal
8. DISC/SHAFT: Integral disc and shaft with smooth, contoured surface provides minimum resistance to flow and reduces material buildup.
9. AIR INLET PORT: Oversized inlet port allows quick valve pressurization / depressurization.
10. DISC: Smooth contoured surface assures extended seat life and disc is easily replaceable.
11. DISC SCREWS: Self-locking screws of high tensile steel provide strong link between disc an shaft, yet allow easy disassembly.
12. HOUSING: Rugged one-piece body fits standard 125/150 class ANSI flat-faced flanges and PN 10 metric flanges.
13. HOUSING GASKET: Die cut elastomeric gasket assures leakproof housing.
14. HOUSING BOLTS: High strength steel bolts maintain structural integrity of housing under the most adverse conditions.
15. SPLIT HOUSING: Rugged two-piece body fits standard 125/150 class ASI flat-faced flanges and PN 10 metric flanges. Minimizes assembly time and allows for integral shaft and disc.
16. RESILIENT SEAT: Easily replaceable, the inflatable molded seat has a smooth contour locking design to minimize stress and hold the seat in place, eliminating any need for flange gaskets.

Available Materials of construction:

Temperature limits: -40º to 300º F (-40º to 150º 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 material of construction

Operating torque: Varies with application

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