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Posi-flate
Butterfly Valve Seat Guide
POSI-FLATE
SEAT ELASTOMER |
FDA MATERIALS |
OPERATING
TEMPERATURES |
MAXIMUM
PRESSURE |
MINIMUM
PRESSURE |
|
Black EPDM |
No |
-20° to 150°
F |
115 PSI |
40 PSI |
|
Black Buna-N |
No |
-10° to 125°
F |
115 PSI |
40 PSI |
|
White Buna-N |
Yes |
+20° to 125°
F |
70 PSI |
40 PSI |
|
Black Polyurethane |
No |
+32° to 150°
F |
115 PSI |
40 PSI |
|
White Polyurethane |
No |
+32° to 150°
F |
115 PSI |
40 PSI |
|
White Silicone, FR* |
Yes |
-40° to 300°
F |
115 PSI |
40 PSI |
|
White Silicone, HS* |
Yes |
-40° to 225°
F |
115 PSI |
40 PSI |
|
Black Fluoroelastomer |
No |
+50° to 200°
F |
55 PSI |
40 PSI |
*FR=Fabric Reinforced
*HS=High Strength
FDA
Materials:
Seats constructed of FDA approved materials.
Operating
Temperature:
Standard operating temperature. Consult factory if temperature
is outside this range.
Maximum
Pressure:
Maximum seat inflation pressure. Consult factory if pressure
is outside this range.
Minimum
Pressure**:
Minimum seat inflation pressure to ensure seal.
**The
actual seat inflation pressure must also exceed line pressure
by a minimum of 15 PSIG.
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