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 |
Compact Flange-Mount Check Valves
- For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
- Piston Material: 316 Stainless Steel
- Spring Material: 316 Stainless Steel
- Seal Material: Viton® Fluoroelastomer
Less than half the end-to-end length of standard flange-mount check valves, these can be installed between ANSI flanges in pipelines with limited clearance. ANSI flanges are sold separately. Valves open to allow flow in one direction and close when flow stops or reverses. All have a 316 stainless steel body 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.
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 | |
316 Stainless Steel Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Flanged × Flanged | ||||||||
| 1/2 | 2.4 | 720 psi @ 100° F | 0.5 | -10° to 400° | 1/4" | 150, 300 | 0000000 | 0000000 |
| 3/4 | 4.4 | 720 psi @ 100° F | 0.5 | -10° to 400° | 1/4" | 150, 300 | 0000000 | 000000 |
| 1 | 6.1 | 720 psi @ 100° F | 0.5 | -10° to 400° | 1/4" | 150, 300 | 0000000 | 000000 |
| 1 1/4 | 12.7 | 720 psi @ 100° F | 0.5 | -10° to 400° | 1/4" | 150, 300 | 0000000 | 000000 |
| 1 1/2 | 18.8 | 720 psi @ 100° F | 0.5 | -10° to 400° | 1/4" | 150, 300 | 0000000 | 000000 |
| 2 | 32 | 720 psi @ 100° F | 0.5 | -10° to 400° | 1/4" | 150, 300 | 0000000 | 000000 |
| 3 | 89 | 720 psi @ 100° F | 0.5 | -10° to 400° | 5/16" | 150, 300 | 0000000 | 000000 |
| 4 | 144 | 720 psi @ 100° F | 0.5 | -10° to 400° | 3/8" | 150, 300 | 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 |
Flanged Check Valves for Harsh Chemicals
- For Use With: Ammonia, Chlorine, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Fuel Oil, Gasoline, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Methanol, Methyl Ethyl Ketone, Mineral Spirits, Oil, Phosphoric Acid, Salt Water, Soap Solutions, Toluene, Water, Xylene
- Ball Material: PTFE Plastic
- Seal Material: PTFE Plastic
Bolt these valves to ANSI flanges. The glass-filled vinyl ester body and PTFE seal stand up to a wide range of harsh chemicals. 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 | Color | End-to-End Lg. | For Flange Class | Flange OD | Number of Bolt Holes | Bolt Hole Size | Bolt Circle Dia. | Bolts Included | Each | |
Glass-Filled Vinyl Ester Body | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Flanged × Flanged | ||||||||||||||
| 1 | 35 | 200 psi @ 250 ° F | 1 | -40° to 250° | Beige | 5" | 150 | 4 1/4" | 4 | 5/8" | 3 1/8" | No | 000000 | 0000000 |
| 2 | 54 | 140 psi @ 250 ° F | 1 | -40° to 250° | Beige | 7" | 150 | 6" | 4 | 3/4" | 4 3/4" | No | 000000 | 000000 |
Flange-Mount Check Valves for Drinking Water
- For Use With: Drinking Water
- Disc Material: 316 Stainless Steel
- Spring Material: 302 Stainless Steel
- Seal Material: EPDM Rubber
Sandwich these valves between ANSI flanges in drinking water pipelines. ANSI flanges are sold separately. Valves meet NSF/ANSI Standard 61, which designates them as safe to use with drinking water. All 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 | |
Iron Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Flanged × Flanged | ||||||||
| 2 | 70 | 200 psi @ 300° F | 2 | 0° to 200° | 1 11/16" | 125, 150 | 000000 | 000000 |
| 3 | 190 | 200 psi @ 300° F | 2 | 0° to 200° | 2 1/2" | 125, 150 | 000000 | 000000 |
| 4 | 340 | 200 psi @ 300° F | 2 | 0° to 200° | 2 1/2" | 125, 150 | 000000 | 000000 |
| 5 | 590 | 200 psi @ 300° F | 2 | 0° to 200° | 2 3/4" | 125, 150 | 000000 | 000000 |
| 6 | 870 | 200 psi @ 300° F | 2 | 0° to 200° | 3" | 125, 150 | 000000 | 000000 |
Flange-Mount Check Valves for Oil and Fuel
- For Use With: Butane, Diesel Fuel, Fuel Oil, Gasoline, Kerosene, Natural Gas, Oil, Propane
- Disc Material: 316 Stainless Steel
- Seal Material: 316 Stainless Steel
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.
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 | |
316 Stainless Steel Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Flanged × Flanged | ||||||||
| 2 | 48 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 3/8" | 150, 300, 600 | 0000000 | 0000000 |
| 2 1/2 | 90 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 5/8" | 150, 300, 600 | 0000000 | 000000 |
| 3 | 171 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 7/8" | 150, 300, 600 | 0000000 | 000000 |
| 4 | 291 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 7/8" | 150, 300 | 0000000 | 000000 |
| 6 | 705 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 3 7/8" | 150, 300 | 0000000 | 00000000 |
| 8 | 1,795 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 5" | 150, 300 | 0000000 | 00000000 |