470 series0 pages

Series 470
High Temperature
Butterfly Valve
The Posi-flate Series 470 valve features a liquid
cooled disc and flanges to keep the elastomer
seat cool. Together the flanges and the disc
fully encapsulate the seat in the closed position
protecting it from the hot material. The application
will determine which of these components need
to be cooled. The cooling fluid is directed through
the housing to the disc, flows around the disc edge
and comes out the other end. The flanges have
internal cooling passages with their own individual
cooling ports.
Standard sizes range from 2” to 16”. The valve
materials can be customized to give the best value
and performance for an application.
How it works
Cooling fluid flows through passages in the disc
and flanges adjacent to the seat. This keeps
the seat cool and prevents degradation of the
elastomer.
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.
The Posi-flate Series 470 High Temperature
Butterfly Valve is an elastomeric seated valve
capable of providing a bubble-tight seal at
temperatures up to 650° F and pressures up to
200 psi.
Closed, sealed
After the valve is closed, the
seat inates against the disc
providing more sealing surface
and an even pressure distribution against the disc.
The valve features Posi-fate’s unique inflatable
seat. This seat uses air pressure to expand the
seat against the disc, providing even pressure
distribution for a bubble tight seal. The seat
makes only casual contact with the disc during
opening and closing, eliminating the wear caused
by impingement style valves. Substantially less
torque is required to open and close the Posi-flate
valve compared to other high temperature valves,
resulting in a more compact size and lower overall
cost.
Open, unsealed
Before the valve opens, the
seat is first deflated. The disc
is then free to rotate to the
open position.
Posi-flate® is a registered trademark of Posi-flate, St. Paul, Minnesota.
© Copyright 2010, Posi-flate®
Corporate Headquarters
Posi-flate • St. Paul, MN USA • +1 651 484-5800
Printed in U.S.A. • Bulletin 20802T-1
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