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.
| 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 | ||||||||
| 6 | 850 | 200 psi @ 70° F | 1.25 | -20° to 250° | 3" | 125 | 0000000 | 0000000 |
Plastic Socket-Connect Check Valves
Also known as backwater valves, these valves prevent backflow of sewage and wastewater in drain, waste, and vent systems. Insert unthreaded pipe into the socket ends and bond with primer and cement to create a permanent, leak-tight connection. Valves open to allow flow in one direction and close when flow stops or reverses. A removable cap provides easy access to internal components for maintenance.
- For Use With: Water
- Pressure Class : Not Rated
- Disc Material: PVC Plastic
- Seal Material: PVC Plastic
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.
| 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 | |||||||||||||||
| 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 | 000000000 |
Flange-Mount Check Valves for Oil and Fuel
- Disc Material: 316 Stainless Steel
- Seal Material: 316 Stainless Steel
- For Use With: Butane, Diesel Fuel, Fuel Oil, Gasoline, Kerosene, Natural Gas, Oil, Propane
Install these valves between ANSI flanges. ANSI flanges are sold separately. All valves open to allow flow in one direction and close when flow stops or reverses. Body is 316 stainless steel for excellent corrosion resistance.
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.
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | For Flange Class | Each | |
316 Stainless Steel Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Flanged × Flanged | ||||||||
| 6 | 705 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 3 7/8" | 150, 300 | 0000000 | 000000000 |