About Backflow-Prevention Valves
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Compact Plastic Threaded Check Valves
- For Use With: Air, Water
- Piston Material: Nylon Plastic
- Spring Material: 316 Stainless Steel
- Seal Material: Buna-N Rubber
At 1 1/2" long or less, these valves fit in confined spaces. They open to allow flow in one direction and close when flow stops or reverses.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Each | |
Nylon Plastic Body  | |||||||
|---|---|---|---|---|---|---|---|
NPT Male × NPT Male | |||||||
| 3/8 × 3/8 | 125 psi @ 70° F | 1 | -20° to 250° | White | 1 1/4" | 0000000 | 000000 |
| 1/2 × 1/4 | 125 psi @ 70° F | 1 | -20° to 250° | White | 1 3/8" | 0000000 | 00000 |
| 1/2 × 1/2 | 125 psi @ 70° F | 1 | -20° to 250° | White | 1 1/2" | 0000000 | 00000 |
| 1/2 × 3/4 | 125 psi @ 70° F | 1 | -20° to 250° | White | 1 1/2" | 0000000 | 00000 |
| 3/4 × 1/2 | 125 psi @ 70° F | 1 | -20° to 250° | White | 1 1/2" | 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.
Nylon valves are more impact resistant than PVC or polypropylene 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" | __ | 1/8" | Not Rated | 125 psi @ 70° F | 1 | 35° to 140° | White | 1 9/16" | 0000000 | 0000 |
| 3/16" | __ | 3/16" | 0.2 | 125 psi @ 70° F | 1 | 35° to 140° | White | 1 3/4" | 0000000 | 0000 |
| 1/4" | __ | 1/8" | Not Rated | 125 psi @ 70° F | 1 | 35° to 140° | White | 1 11/16" | 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" | __ | 1/4" | Not Rated | 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 1/8" | 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 |
| 3/16" | 1/8 | __ | 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 |
| 3/8" | 1/4 | __ | 1 | 125 psi @ 70° F | 1 | 35° to 140° | White | 3 3/16" | 00000000 | 00000 |
- For Use With: Air, Water
- Piston Material: Nylon Plastic
- Spring Material: 316 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 × NPT Male Outlet | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 3/16" | 1/8 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 1/2" | 0000000 | 000000 |
| 1/4" | 1/4 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 5/8" | 0000000 | 00000 |
| 1/4" | 1/2 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 3/4" | 0000000 | 00000 |
| 3/8" | 3/8 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 5/8" | 00000000 | 00000 |
| 3/8" | 1/2 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 3/4" | 00000000 | 00000 |
| 1/2" | 3/8 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 9/16" | 00000000 | 00000 |
| 1/2" | 1/2 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 11/16" | 00000000 | 00000 |
| 1/2" | 3/4 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 11/16" | 00000000 | 00000 |
| 5/8" | 3/8 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 5/8" | 00000000 | 00000 |
| 5/8" | 1/2 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 3/4" | 00000000 | 00000 |
| 5/8" | 3/4 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 13/16" | 00000000 | 00000 |
| 3/4" | 1/2 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 7/8" | 00000000 | 00000 |
| 3/4" | 3/4 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 7/8" | 00000000 | 00000 |
| 3/4" | 1 | __ | Not Rated | Not Rated | 1 | -20° to 250° | White | 2 5/16" | 00000000 | 00000 |
NPT Male Inlet × Barbed Male Outlet | ||||||||||
| __ | 1/8 | 3/16" | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 1/2" | 0000000 | 00000 |
| __ | 1/4 | 1/4" | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 5/8" | 0000000 | 00000 |
| __ | 1/4 | 3/8" | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 5/8" | 0000000 | 00000 |
| __ | 3/8 | 3/8" | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 5/8" | 0000000 | 00000 |
| __ | 1/2 | 3/8" | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 3/4" | 0000000 | 00000 |
| __ | 1/2 | 1/2" | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 3/4" | 0000000 | 00000 |
| __ | 3/4 | 3/8" | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 3/4" | 00000000 | 00000 |
| __ | 3/4 | 5/8" | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 13/16" | 00000000 | 00000 |
| __ | 3/4 | 3/4" | Not Rated | Not Rated | 1 | -20° to 250° | White | 1 7/8" | 00000000 | 00000 |
| __ | 1 | 3/4" | Not Rated | Not Rated | 1 | -20° to 250° | White | 2 5/16" | 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.
Nylon valves are more impact resistant than polypropylene 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 | -60° to 200° | Silicone Rubber | Silicone Rubber | Off-White | 1 1/4" | 000000000 | 00000 |
| __ | 3/16" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | Black | 1 11/16" | 00000000 | 0000 |
| __ | 3/16" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluorosilicone Rubber | Fluorosilicone Rubber | Black | 1 11/16" | 00000000 | 0000 |
| __ | 1/4" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluorosilicone Rubber | Fluorosilicone Rubber | Black | 1 9/16" | 00000000 | 0000 |
| __ | 5/16" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluorosilicone Rubber | Fluorosilicone Rubber | Black | 1 9/16" | 00000000 | 0000 |
| __ | 3/8" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | Black | 1 9/16" | 000000000 | 0000 |
| __ | 3/8" | 50 psi @ 65° F | 0.5 | -60° to 200° | Silicone Rubber | Silicone Rubber | Off-White | 1 7/8" | 000000000 | 000 |
Unthreaded Male Inlet × Unthreaded Male Outlet | ||||||||||
| __ | 1/8" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluorosilicone Rubber | Fluorosilicone Rubber | Black | 1 5/8" | 00000000 | 0000 |
NPT Male Inlet × Barbed Male Outlet | ||||||||||
| 1/8 | 1/8" | 50 psi @ 65° F | 0.5 | -60° to 200° | Silicone Rubber | Silicone Rubber | Off-White | 1 3/8" | 0000000 | 0000 |
| 1/8 | 3/16" | 50 psi @ 65° F | 0.5 | -60° to 200° | Silicone Rubber | Silicone Rubber | Off-White | 1 9/16" | 0000000 | 0000 |
| 1/8 | 3/8" | 50 psi @ 65° F | 0.5 | -60° to 200° | Silicone Rubber | Silicone Rubber | Off-White | 1 5/8" | 0000000 | 0000 |
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.
Nylon valves are more impact resistant than polypropylene 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
- Ball Material: Stainless Steel
- Spring Material: 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 | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/8 | 1.1 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 1/4" | 00000000 | 000000 |
| 1/4 | 1.2 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 1/4" | 00000000 | 00000 |
| 1/4 | 1.2 | 125 psi @ 70° F | 0.33 | 35° to 140° | White | 2 1/4" | 00000000 | 00000 |
NPT Female × NPT Male | ||||||||
| 1/4 | Not Rated | 125 psi @ 70° F | 0.33 | 35° to 140° | White | 2 9/16" | 00000000 | 00000 |
| 1/4 | 1 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 9/16" | 00000000 | 00000 |
NPT Male × NPT Female | ||||||||
| 1/8 | 1 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 7/16" | 00000000 | 00000 |
| 1/4 | Not Rated | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 9/16" | 00000000 | 00000 |
NPT Male × NPT Male | ||||||||
| 1/8 | 0.9 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 11/16" | 00000000 | 00000 |
| 1/4 | 1 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 7/8" | 00000000 | 00000 |
Air Flow Check Valves
Inlet × Push-to-Connect
Female Outlet
Valves open to allow flow in one direction and close when flow stops or reverses.
Valves with push-to-connect ports are for use with plastic or soft metal tubing. Insert tubing into the port.
Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve.
For technical drawings and 3-D models, click on a part number.
Overall | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Inlet Tube OD | For Outlet Tube OD | Flow Coefficient (Cv) | Max. Pressure, psi | Min. Opening Pressure, psi | Temp. Range, °F | Lg. | Dia. | Color | Each | |
Nylon Plastic Body | ||||||||||
| 5/32" | 5/32" | 0.14 | 145 | 7 | 32° to 158° | 1 1/2" | 5/8" | Black | 000000 | 000000 |
| 1/4" | 1/4" | 0.16 | 145 | 7 | 32° to 158° | 1 5/8" | 3/4" | Black | 000000 | 00000 |
| 5/16" | 5/16" | 0.93 | 145 | 7 | 32° to 158° | 2 1/16" | 3/4" | Black | 000000 | 00000 |
| 3/8" | 3/8" | Not Rated | 145 | 7 | 32° to 158° | 2 1/2" | 15/16" | Black | 000000 | 00000 |
| 4mm | 4mm | 0.14 | 145 | 7 | 32° to 158° | 38.1mm | 15.9mm | Black | 000000 | 00000 |
| 6mm | 6mm | 0.16 | 145 | 7 | 32° to 158° | 41.3mm | 15.9mm | Black | 000000 | 00000 |
| 8mm | 8mm | 0.93 | 145 | 7 | 32° to 158° | 51mm | 19mm | Black | 000000 | 00000 |
| 10mm | 10mm | Not Rated | 145 | 7 | 32° to 158° | 63.5mm | 23.8mm | Black | 000000 | 00000 |
| 12mm | 12mm | Not Rated | 145 | 7 | 32° to 158° | 66.7mm | 23.8mm | Black | 000000 | 00000 |