Posi Flate Butterfly Valves
Corporate Headquarters
Posi Flate Butterfly Valves
1125 Willow Lake Blvd.
St. Paul, MN 55110 USA
Phone: +1-651-484-5800
Fax: +1-651-484-7015
Email: info@posiflate.com
Website: www.posiflate.com
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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.

Split housing with integral stainless steel disc and shaft.
Unit of Measure

Technical Specs

Brands

 N/A Posi-flate®

Size

 N/A 2 to 30 in50 to 800 mm
Temperature Limits1 N/A -40 to 350 ºF-40 to 175 ºC
Air Supply2 N/A 115 psig7.9 bar
Working Pressure3 N/A Full vacuum to 100 psig6.9 bar

Operating Torque

 N/A Varies with Application.

Available Materials of Construction

Housing

 N/A Aluminum Cast Iron Epoxy Coated Cast Iron Nickel-Plated Cast Iron Nylon Coated Cast Iron Stainless Steel

Resilient Seat

 N/A Buna-N Ethylene Propylene Diene Monomer (EPDM) Fluoroelastomer Food and Drug Administration (FDA) Silicone Food and Drug Administration (FDA) White Buna-N Food and Drug Administration (FDA) White Ethylene Propylene Diene Monomer (EPDM) Food and Drug Administration (FDA) White Fluoroelastomer Polyurethane

Disc

 N/A 316 Stainless Steel (Satin or Polished) Molded Nylon Per- and Polyfluoroalkyl Substances (PFAS)-free Polytetrafluoroethylene (PTFE) Nickel and Nylon Coating Available Cast Iron

Bearings

 N/A Bronze Polymer

Disc Screws

 N/A Carbon Steel Stainless Steel

Shaft

 N/A 316 Stainless Steel Zinc-Plated Carbon Steel

Shaft Seal

 N/A Buna-N Fluoroelastomer

Housing Gasket

 N/A Buna-N

Retaining Ring

 N/A Carbon Steel Stainless Steel

Housing Bolts

 N/A Carbon Steel Stainless Steel

Dimensions

Dimensions

 N/A
Dimensions

Series 485 Inflatable Seated Butterfly Valves - 2

Performance Features

Performance Features

 N/A
  • 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 buildup
  • Double shaft seals
  • Multiple bearings
  • Fail-safe monitoring

How it Works?

How it Works?

 N/A Closed, unsealed
As the valve rotates into the closed position, the disc makes only casual contact with the seat, reducing friction, wear and torque requirements.

Closed, sealed
After the valve is closed, the seat inflates against the disc providing more sealing surface and an even pressure distribution against the disc.

Open, unsealed
Before the valve opens, the seat is first deflated. The disc is then free to rotate to the open position.

Design Features for Reliable Performance

Design Features for Reliable Performance

 N/A
  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 fl ow 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 and 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 ANSI 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.

Note

Note

 N/A All specifications subject to change without notice.
Customized materials available.
Posi-flate® is a registered trademark of Posi-flate®, St. Paul, Minnesota.
Made in the U.S.A.
Foreign patents pending.
  • 1 Varies with application and materials of construction.
  • 2 Maximum to seat, varies with application.
  • 3 Varies with materials of construction.