About Backflow-Prevention Valves
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Flange-Mount Check Valves
- For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
- Disc Material: Bronze
- Seal Material: Buna-N Rubber
Sandwich these valves between two ANSI flanges for backflow prevention at a fraction of the weight of flanged check valves and a reduced pipeline footprint. ANSI flanges are sold separately. All valves open to allow flow in one direction and close when flow stops or reverses.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
For technical drawings and 3-D models, click on a part number.
| Pipe Size  | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | For Flange Class | Each | |
Cast Iron Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Flanged × Flanged | ||||||||
| 2 | 60 | 200 psi @ 70° F | 1.25 | -20° to 250° | 2 1/8" | 125 | 0000000 | 000000 |
| 2 1/2 | 100 | 200 psi @ 70° F | 1.25 | -20° to 250° | 2 1/8" | 125 | 0000000 | 00000 |
| 3 | 170 | 200 psi @ 70° F | 1.25 | -20° to 250° | 2 1/4" | 125 | 0000000 | 000000 |
| 4 | 340 | 200 psi @ 70° F | 1.25 | -20° to 250° | 2 1/2" | 125 | 0000000 | 000000 |
| 5 | 520 | 200 psi @ 70° F | 1.25 | -20° to 250° | 2 3/4" | 125 | 0000000 | 000000 |
| 6 | 850 | 200 psi @ 70° F | 1.25 | -20° to 250° | 3" | 125 | 0000000 | 000000 |
| 8 | 1,600 | 200 psi @ 70° F | 1.25 | -20° to 250° | 3 3/4" | 125 | 0000000 | 000000 |
| 10 | 2,400 | 200 psi @ 70° F | 1.25 | -20° to 250° | 4 1/4" | 125 | 0000000 | 000000 |
Flanged Check Valves
- For Use With: Air, Steam, Water
- Disc Material:
Pipe Size 4 and smaller: Bronze
Pipe Size 5 and larger: Iron - Seal Material: Bronze
Bolt these valves to ANSI flanges. They open to allow flow in one direction and close when flow stops or reverses. All have a removable cap that provides easy access to internal components for maintenance.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | Flow Coefficient (Cv) | Pressure Class | Max. Pressure | Max. Steam Pressure | Min. Opening Pressure | Temperature Range, °F | End-to-End Lg. | Flange OD | No. of Bolt Holes | Bolt Hole Size | Bolt Circle Dia. | Bolts Included | Includes | Each | |
Cast Iron Body | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Flanged × Flanged | |||||||||||||||
| 2 | 110 | 125 | 200 psi @ 70° F | 125 psi @ 353° F | 1 psi | -20° to 405° | 8" | 6" | 4 | 5/8" | 4 3/4" | No | Removable Cap | 0000000 | 0000000 |
| 2 1/2 | 193 | 125 | 200 psi @ 70° F | 125 psi @ 353° F | 1 psi | -20° to 405° | 8 1/2" | 7" | 4 | 5/8" | 5 1/2" | No | Removable Cap | 0000000 | 000000 |
| 3 | 292 | 125 | 200 psi @ 70° F | 125 psi @ 353° F | 1 psi | -20° to 405° | 9 1/2" | 7 1/2" | 4 | 5/8" | 6" | No | Removable Cap | 0000000 | 000000 |
| 4 | 468 | 125 | 200 psi @ 70° F | 125 psi @ 353° F | 1 psi | -20° to 405° | 11 1/2" | 9" | 8 | 5/8" | 7 1/2" | No | Removable Cap | 0000000 | 000000 |
| 5 | 735 | 125 | 200 psi @ 70° F | 125 psi @ 353° F | 1 psi | -20° to 405° | 13" | 10" | 8 | 3/4" | 8 1/2" | No | Removable Cap | 0000000 | 00000000 |
| 6 | 1,060 | 125 | 200 psi @ 70° F | 125 psi @ 353° F | 1 psi | -20° to 405° | 14" | 11" | 8 | 3/4" | 9 1/2" | No | Removable Cap | 0000000 | 00000000 |
| 8 | 1,880 | 125 | 200 psi @ 70° F | 125 psi @ 353° F | 1 psi | -20° to 405° | 19 1/2" | 13 1/2" | 8 | 3/4" | 11 3/4" | No | Removable Cap | 0000000 | 00000000 |
Arresters for Flammable Vapors
Minimize fire hazard from flammable vapors. Mount an arrester to your vent pipe to stop flames from traveling back into your tank. If the ambient temperature reaches 165° F, the fusible links melt, and the cover closes to block flames from the arrester. To reuse the arrester, replace the fusible links (sold separately).
For technical drawings and 3-D models, click on a part number.