About Backflow-Prevention Valves
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Plastic Threaded Check Valves
Plastic provides a lightweight alternative to metal. These valves open to allow flow in one direction and close when flow stops or reverses.
Glass-filled polypropylene valves are more corrosion resistant than PVC 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.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
- Piston Material: Polypropylene Plastic
- Spring Material: 302 Stainless Steel
- Seal Material: Buna-N Rubber
Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Each | |
NPT Female Inlet × NPT Female Outlet | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4 | 3 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2" | 0000000 | 000000 |
| 3/8 | 4.2 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 1/16" | 0000000 | 00000 |
| 1/2 | 8.1 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 1/2" | 0000000 | 00000 |
| 3/4 | 14.8 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 3/4" | 0000000 | 00000 |
Check Valves with Barbed Fittings
Barbs grip onto tubing, providing a secure hold. These valves open to allow flow in one direction and close when flow stops or reverses.
Polypropylene valves are more corrosion resistant than PVC or nylon 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.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
- Ball Material: 316 Stainless Steel
- Spring Material: 302 Stainless Steel
- Seal Material: Buna-N Rubber
| For Inlet Tube ID | Pipe Size | For Outlet Tube ID | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Each | |
Barbed Male Inlet × Barbed Male Outlet | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1/8" | __ | 1/8" | 0.1 | 125 psi @ 70° F | 1 | 35° to 140° | White | 1 3/8" | 0000000 | 00000 |
| 1/8" | __ | 1/4" | Not Rated | 125 psi @ 70° F | 1 | 35° to 140° | White | 1 11/16" | 0000000 | 0000 |
| 3/16" | __ | 3/16" | 0.2 | 125 psi @ 70° F | 1 | 35° to 140° | White | 1 3/4" | 0000000 | 0000 |
| 3/16" | __ | 1/4" | Not Rated | 125 psi @ 70° F | 1 | 35° to 140° | White | 1 7/8" | 0000000 | 0000 |
| 1/4" | __ | 1/4" | 0.3 | 125 psi @ 70° F | 1 | 35° to 140° | White | 2 1/16" | 0000000 | 0000 |
| 5/16" | __ | 5/16" | 1 | 125 psi @ 70° F | 1 | 35° to 140° | White | 3 1/2" | 0000000 | 00000 |
| 3/8" | __ | 3/8" | Not Rated | 125 psi @ 70° F | 1 | 35° to 140° | White | 3 1/2" | 0000000 | 00000 |
| 1/2" | __ | 1/2" | 1 | 125 psi @ 70° F | 1 | 35° to 140° | White | 3 1/2" | 0000000 | 00000 |
Barbed Male Inlet × NPT Male Outlet | ||||||||||
| 1/8" | 1/8 | __ | Not Rated | 125 psi @ 70° F | 1 | 35° to 140° | White | 1 5/8" | 00000000 | 0000 |
| 1/8" | 1/4 | __ | Not Rated | 125 psi @ 70° F | 1 | 35° to 140° | White | 1 13/16" | 00000000 | 0000 |
| 1/4" | 1/4 | __ | Not Rated | 125 psi @ 70° F | 1 | 35° to 140° | White | 2 1/8" | 00000000 | 0000 |
| 5/16" | 1/4 | __ | Not Rated | 125 psi @ 70° F | 1 | 35° to 140° | White | 3 3/16" | 00000000 | 00000 |
High-Cycling Check Valves
With internal components that resist wear from frequent operation, these valves can cycle as often as once per second. Barbed fittings and unthreaded fittings grip onto tubing, providing a secure hold. All valves open to allow flow in one direction and close when flow stops or reverses.
Polypropylene valves are more corrosion resistant than nylon valves.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Water
- Diaphragm Material: See table
- Seal Material: See table
| Pipe Size | For Tube ID | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Diaphragm Material | Seal Material | Color | End-to-End Lg. | Each | |
Barbed Male Inlet × Barbed Male Outlet | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| __ | 1/8" | 50 psi @ 65° F | 0.5 | 32° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | Off-White | 1 1/4" | 000000000 | 00000 |
| __ | 3/16" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | White | 1 11/16" | 00000000 | 0000 |
| __ | 1/4" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | Black | 1 9/16" | 00000000 | 0000 |
| __ | 1/4" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluorosilicone Rubber | Fluorosilicone Rubber | Black | 1 9/16" | 000000000 | 0000 |
| __ | 5/16" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | Black | 1 3/4" | 00000000 | 0000 |
| __ | 3/8" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluorosilicone Rubber | Fluorosilicone Rubber | Black | 1 9/16" | 000000000 | 0000 |
| __ | 3/8" | 50 psi @ 65° F | 0.5 | 32° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | Off-White | 1 7/8" | 000000000 | 0000 |
Unthreaded Male Inlet × Unthreaded Male Outlet | ||||||||||
| __ | 1/8" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | White | 1 5/8" | 00000000 | 0000 |
| __ | 1/8" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluorosilicone Rubber | Fluorosilicone Rubber | Black | 1 5/8" | 000000000 | 0000 |
NPT Male Inlet × Barbed Male Outlet | ||||||||||
| 1/8 | 1/8" | 50 psi @ 65° F | 0.5 | 32° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | Off-White | 1 3/8" | 000000000 | 0000 |
| 1/8 | 3/16" | 50 psi @ 65° F | 0.5 | 32° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | Off-White | 1 1/2" | 000000000 | 0000 |
| 1/8 | 1/4" | 50 psi @ 65° F | 0.5 | 32° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | Off-White | 1 1/2" | 000000000 | 0000 |
| 1/8 | 3/8" | 50 psi @ 65° F | 0.5 | 32° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | Off-White | 1 5/8" | 000000000 | 0000 |
Easy-to-Install Threaded Check Valves for Harsh Chemicals
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.
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.
For technical drawings and 3-D models, click on a part number.
- 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 |
Check Valves with Barbed Fittings for Harsh Chemicals
Prevent backflow in chemical tubing lines. These valves have barbed fittings that grip onto tubing, providing a secure hold. 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.
Polypropylene valves are more corrosion resistant than nylon 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.
For technical drawings and 3-D models, click on a part number.
- For Use With: Acetone, Air, Argon, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Fuel Oil, Gasoline, Helium, Kerosene, Krypton, Mineral Spirits, Neon, Nitrogen, Oil, Propane, Salt Water, Soap Solutions, Toluene, Water, Xenon, Xylene
- Ball Material: 316 Stainless Steel
- Spring Material: 302 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
Plastic Threaded Check Valves for Oil and Fuel
Plastic provides a lightweight alternative to metal. These 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.
- For Use With: Diesel Fuel, Gasoline, Oil
- Piston Material: Polypropylene Plastic
- Spring Material: 302 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Each | |
NPT Female × NPT Female | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4 | 3 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2" | 0000000 | 000000 |
| 3/8 | 4.2 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 1/16" | 0000000 | 00000 |
| 1/2 | 8.1 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 1/2" | 0000000 | 00000 |
| 3/4 | 14.8 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 3/4" | 0000000 | 00000 |