Valve Disc & Gasket Changes
Valve Disc and Gaskets are sometimes changed/substituted for better performance with a given fluid. The change is represented by the insertion of a letter representing the substituted Disc/Gasket material (see examples below).
| Seal Material | Temperature Range | Application Seal Recommendations |
|---|---|---|
| Buna-N | -40°F to +250°F | Water, Air, Brine, Gas, Oil, Solvent |
| PTFE | -500°F to +500°F | Liquid Oxygen, Cryogenics |
| Viton® | -20°F to +400°F | Diesel Fuel & Gasoline Gaseous Oxygen applications Viton provides tighter seating |
Valve Type Disc / Gasket Changes:
V ----- Viton® Disc (i.e. Type 18A44 with Viton® Seals becomes 18AV44)
T ----- PTFE Disc (i.e. Type 18A44 with PTFE Seals becomes 18AT44)
B ----- Buna-N Disc (i.e. Type 16L44 with Buna-N Seals becomes 16LB44)
Viton® is a registered trademark of DuPont Performance Elastomers.
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