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Posi-flate Butterfly Valve Seat Guide
| SEAT TYPE |
PRESSURE RANGE PSIG (BARG) |
TEMPERATURE
RANGE
°F (°C) |
| SERIES 435, 436, 485, 486, 487 & 488 |
SERIES
483 & 484 |
SERIES
585 & 586 |
| Min. |
Max. |
Min. |
Max. |
Min. |
Max. |
Min. |
Max. |
|
Black Buna
|
40
(2.8) |
115
(7.9) |
40
(2.8) |
70
(4.8) |
60
(4.0) |
115
(7.9) |
-10°
(-23°) |
125°
(52°) |
|
FDA White Buna
|
40
(2.8) |
70
(4.8) |
40
(2.8) |
70
(4.8) |
60
(4.0) |
70
(4.8) |
20°
(-7°) |
125°
(52°) |
|
Black EPDM
|
40
(2.8) |
115
(7.9) |
40
(2.8) |
70
(4.8) |
60
(4.0) |
130
(9.0) |
-20°
(-29°) |
150°
(65°) |
|
FDA White EPDM
|
40
(2.8) |
70
( 7.9) |
40
(2.8) |
70
(4.8) |
60
(4.0) |
90
(9.0) |
20°
(-7°) |
125°
(52°) |
|
|
40
(2.8) |
115
(7.9) |
40
(2.8) |
70
(4.8) |
60
(4.0) |
130
(9.0) |
32°
(0°) |
150°
(65°) |
|
White Polyurethane
|
70
(4.8) |
115
(7.9) |
70
(4.8) |
70
(4.8) |
80
(5.5) |
115
(7.9) |
32°
(0°) |
150°
(65°) |
|
FDA White Silicone
|
40
(2.8) |
115
(7.9) |
40
(2.8) |
70
(4.8) |
N/A |
N/A |
-40°
(-40°) |
300°
(149°) |
|
Black Fluoroelastomer
|
40
(2.8) |
55
(3.8) |
40
(2.8) |
55
(3.8) |
60
(4.0) |
70
(4.8) |
50°
(10°) |
300°
(149°) |
|
FDA White Fluoroelastomer
|
40
(2.8) |
55
(3.8) |
40
(2.8) |
55
(3.8) |
60
(4.0) |
70
(4.8) |
50°
(10°) |
300°
(149°) |
|
FDA White Silicone HS
|
40
(2.8) |
115
(7.9) |
40
(2.8) |
70
(4.8) |
60
(4.0) |
130
(9.0) |
-40°
(-40°) |
350°
(175°) |
If operating outside of these constraints, please consult factory.
FDA Materials: Seats constructed of FDA approved materials.
Temperature Range: Operating temperature range.
Maximum Pressure: Maximum seat inflation pressure.
Minimum Pressure**: Minimum seat inflation pressure to ensure seal.
**Seat inflation should be regulated to a minimum of 15 psig (1 barg) above material process pressure. Seat inflation should never be set below 40 psig (2.8 barg) for 430 and 480 Series valves. Seat inflation should never be below 60 psig (4.0 barg) for 580 Series valves.
 
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