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About Backflow-Prevention Valves
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Easy-to-Install Threaded Check Valves for Harsh Chemicals
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Exploded View
To reduce installation time and allow for maintenance without detaching pipe connections, these valves have union fittings. The plastic body and fluoroelastomer seal provide excellent chemical resistance. Valves open to allow flow in one direction and close when flow stops or reverses.
Valves for drinking water meet NSF/ANSI 61.
PVC and CPVC valves come with unthreaded socket-connect female fittings in addition to the threaded NPT female fittings.
Polypropylene valves are more corrosion resistant than PVC or CPVC valves.
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.
PVC Plastic Body
- For Use With:
BSPP thread type:
Butane, Kerosene, Liquid Carbon Dioxide, Natural Gas, Nitric Acid, Oxygen, Phosphoric Acid, Propane, Salt Water, Soap Solutions, Water
NPT thread type:
Citric Acid, Diesel Fuel, Drinking Water, Ethylene Glycol, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Sodium Hypochlorite, Water - Ball Material: PVC Plastic
- Seal Material: Fluoroelastomer Rubber
| Pipe Size  | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Specifications Met | Each | |
BSPP Female × BSPP Female | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 6.3 | 150 psi @ 70° F | 1 | 40° to 140° | Dark Gray | 4 1/4" | ASTM D1784 | 0000000 | 0000000 |
| 1 | 25 | 150 psi @ 70° F | 1 | 40° to 140° | Dark Gray | 5 3/16" | ASTM D1784 | 0000000 | 000000 |
NPT Female × NPT Female | |||||||||
| 1/2 | 4.8 | 150 psi @ 70° F | 1 | 40° to 140° | Dark Gray | 4 11/16" | ASTM D1784, NSF/ANSI 61 | 0000000 | 00000 |
| 3/4 | 7.7 | 150 psi @ 70° F | 1 | 40° to 140° | Dark Gray | 4 3/4" | ASTM D1784, NSF/ANSI 61 | 0000000 | 00000 |
| 1 | 11 | 150 psi @ 70° F | 1 | 40° to 140° | Dark Gray | 5 3/8" | ASTM D1784, NSF/ANSI 61 | 0000000 | 00000 |
| 1 1/4 | 25 | 150 psi @ 70° F | 1 | 40° to 140° | Dark Gray | 6 1/4" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
| 1 1/2 | 45 | 150 psi @ 70° F | 1 | 40° to 140° | Dark Gray | 6 3/4" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
| 2 | 130 | 150 psi @ 70° F | 1 | 40° to 140° | Dark Gray | 8 1/8" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
CPVC Plastic Body
- For Use With: Citric Acid, Diesel Fuel, Drinking Water, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Nitric Acid, Phosphoric Acid, Salt Water, Sodium Hypochlorite, Water
- Ball Material: CPVC Plastic
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Specifications Met | Each | |
NPT Female × NPT Female | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 4.8 | 150 psi @ 70° F | 1 | 35° to 190° | Light Gray | 4 11/16" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
| 3/4 | 7.7 | 150 psi @ 70° F | 1 | 35° to 190° | Light Gray | 4 3/4" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
| 1 | 11 | 150 psi @ 70° F | 1 | 35° to 190° | Light Gray | 5 3/8" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
| 1 1/4 | 25 | 150 psi @ 70° F | 1 | 35° to 190° | Light Gray | 6 1/4" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
| 1 1/2 | 45 | 150 psi @ 70° F | 1 | 35° to 190° | Light Gray | 6 3/4" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
| 2 | 130 | 150 psi @ 70° F | 1 | 35° to 190° | Light Gray | 8 1/8" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
Polypropylene Plastic Body
- For Use With: Air, Ammonia, Butane, Carbon Dioxide, Citric Acid, Deionized Water, Ethanol, Ethylene Glycol, Isopropyl Alcohol, Kerosene, Methanol, Natural Gas, Oil, Oxygen, Phosphoric Acid, Salt Water, Soap Solutions, Sodium Hydroxide, Water
- Ball Material: Polypropylene Plastic
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Specifications Met | Each | |
NPT Female × NPT Female | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 4.8 | 150 psi @ 70° F | 1 | 35° to 160° | White | 4 11/16" | ASTM D4101 | 0000000 | 0000000 |
| 3/4 | 7.7 | 150 psi @ 70° F | 1 | 35° to 160° | White | 4 3/4" | ASTM D4101 | 0000000 | 000000 |
| 1 | 11 | 150 psi @ 70° F | 1 | 35° to 160° | White | 5 3/8" | ASTM D4101 | 0000000 | 000000 |
| 1 1/2 | 45 | 150 psi @ 70° F | 1 | 35° to 160° | White | 6 3/4" | ASTM D4101 | 0000000 | 000000 |
| 2 | 130 | 150 psi @ 70° F | 1 | 35° to 160° | White | 8 1/8" | ASTM D4101 | 0000000 | 000000 |