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About Backflow-Prevention Valves
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Threaded Check Valves
Female Inlet × Female Outlet
Male Inlet × Male Outlet
These valves open to allow flow in one direction and close when flow stops or reverses.
Nickel-plated brass valves are more corrosion resistant than plain brass or bronze 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.
Connectors, NPTF Female Inlet × NPTF Female Outlet
- For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
- Spring Material: 304 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Brass Body—Brass Spring-Loaded Piston | |||||||
|---|---|---|---|---|---|---|---|
| 1/8 | 1.1 | 1,000 psi @ 70° F | 0.3 | 10° to 400° | 2" | 0000000 | 000000 |
| 1/4 | 1.1 | 1,000 psi @ 70° F | 0.3 | 10° to 400° | 2 1/16" | 0000000 | 00000 |
| 3/8 | 5.2 | 1,000 psi @ 70° F | 0.3 | 10° to 400° | 2 3/8" | 0000000 | 00000 |
| 1/2 | 5.2 | 1,000 psi @ 70° F | 0.3 | 10° to 400° | 2 1/2" | 0000000 | 00000 |
Connectors, NPTF Male Inlet × NPTF Male Outlet
- For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
- Spring Material: 304 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Brass Body—Brass Spring-Loaded Piston | |||||||
|---|---|---|---|---|---|---|---|
| 1/8 | 1.1 | 1,000 psi @ 70° F | 0.3 | 10° to 400° | 1 1/4" | 0000000 | 000000 |
| 1/4 | 1.1 | 1,000 psi @ 70° F | 0.3 | 10° to 400° | 1 13/16" | 0000000 | 00000 |
| 3/8 | 5.2 | 1,000 psi @ 70° F | 0.3 | 10° to 400° | 2 7/16" | 0000000 | 00000 |
| 1/2 | 5.2 | 1,000 psi @ 70° F | 0.3 | 10° to 400° | 2 1/2" | 0000000 | 00000 |
Check Valves with Push-to-Connect Fittings for Harsh Chemicals
- For Use With: Air, Argon, Butane, Carbon Dioxide, Chlorine, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Gasoline, Helium, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Krypton, Mineral Spirits, Natural Gas, Neon, Nitric Acid, Nitrogen, Oil, Oxygen, Phosphoric Acid, Propane, Salt Water, Soap Solutions, Sodium Hypochlorite, Sulfuric Acid, Toluene, Water, Xenon, Xylene
- Piston Material: PVDF Plastic
- Spring Material: Stainless Steel
- Seal Material: Fluoroelastomer Rubber
Connect your outlet tubing into the push-to-connect fittings—no heat, solder, or flux required. These valves have a PVDF body and a fluoroelastomer seal for excellent chemical resistance. 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.
| For Tube OD | Pipe Size | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Each | |
PVDF Plastic Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Push-to-Connect Inlet × NPTF Male Outlet | ||||||||
| 3/8" | 1/4 | 300 psi @ 70° F | 0.5 | 0° to 250° | Black | 1 3/8" | 0000000 | 000000 |
Backflow-Prevention Inline Hydraulic Valves
Also known as check valves, these open to allow flow in one direction and close when flow stops or reverses.
Brass valves have good corrosion resistance. 303 stainless steel valves are more corrosion resistant than brass valves.
NPTF (Dryseal) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
NPTF Female Inlet × NPTF Female Outlet—Ball Check Valve
NPTF — NPTF (Female)
Inlet Connection | Outlet Connection | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Pipe Size | Dash Size | Max. Flow Rate, gpm | Flow Coefficient (Cv) | Max. Pressure, psi | Min. Opening Pressure, psi | Port-to-Port Lg. | Hex Wd. | Mounting Orientation | Temp. Range, °F | Each | |
Brass Body | |||||||||||||
| 1/8 | 02 | 1/8 | 02 | 1.5 | 0.23 | 2,000 | 2.5 | 1 1/2" | 11/16" | Any Position | -15° to 400° | 0000000 | 000000 |
| 1/4 | 04 | 1/4 | 04 | 3 | 0.54 | 2,000 | 2.5 | 2" | 7/8" | Any Position | -15° to 400° | 0000000 | 00000 |
| 1/4 | 04 | 1/4 | 04 | 6 | 1.47 | 2,000 | 2.5 | 2" | 3/4" | Any Position | -30° to 200° | 0000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 5 | 0.83 | 2,000 | 2.5 | 2 1/4" | 1 1/16" | Any Position | -15° to 400° | 0000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 10 | 3.3 | 2,000 | 2.5 | 2 1/2" | 1" | Any Position | -30° to 200° | 0000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 8 | 1.47 | 2,000 | 2.5 | 2 3/4" | 1 5/16" | Any Position | -15° to 400° | 0000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 12 | 3.6 | 2,000 | 2.5 | 2 7/8" | 1 1/8" | Any Position | -30° to 200° | 0000000 | 00000 |
| 3/4 | 12 | 3/4 | 12 | 12 | 1.9 | 2,000 | 2.5 | 3" | 1 5/8" | Any Position | -15° to 400° | 0000000 | 00000 |
| 3/4 | 12 | 3/4 | 12 | 20 | 5.41 | 2,000 | 2.5 | 3 1/4" | 1 3/8" | Any Position | -30° to 200° | 0000000 | 00000 |
Steel Body | |||||||||||||
| 1/8 | 02 | 1/8 | 02 | 1.5 | 0.23 | 5,000 | 2.5 | 1 1/2" | 11/16" | Any Position | -15° to 400° | 0000000 | 00000 |
| 1/4 | 04 | 1/4 | 04 | 3 | 0.54 | 5,000 | 2.5 | 2" | 7/8" | Any Position | -15° to 400° | 0000000 | 00000 |
| 1/4 | 04 | 1/4 | 04 | 6 | 1.47 | 5,000 | 2.5 | 2" | 3/4" | Any Position | -30° to 200° | 0000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 5 | 0.83 | 5,000 | 2.5 | 2 1/4" | 1 1/16" | Any Position | -15° to 400° | 0000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 10 | 3.3 | 5,000 | 2.5 | 2 1/2" | 1" | Any Position | -30° to 200° | 0000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 8 | 1.47 | 5,000 | 2.5 | 2 3/4" | 1 5/16" | Any Position | -15° to 400° | 0000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 12 | 3.6 | 5,000 | 2.5 | 2 7/8" | 1 1/8" | Any Position | -30° to 200° | 0000000 | 00000 |
| 3/4 | 12 | 3/4 | 12 | 12 | 1.9 | 5,000 | 2.5 | 3" | 1 5/8" | Any Position | -15° to 400° | 0000000 | 00000 |
| 3/4 | 12 | 3/4 | 12 | 20 | 5.41 | 5,000 | 2.5 | 3 1/4" | 1 3/8" | Any Position | -30° to 200° | 0000000 | 00000 |
303 Stainless Steel Body | |||||||||||||
| 1/8 | 02 | 1/8 | 02 | 1.5 | 0.23 | 5,000 | 2.5 | 1 1/2" | 11/16" | Any Position | -15° to 400° | 0000000 | 00000 |
| 1/4 | 04 | 1/4 | 04 | 3 | 0.54 | 5,000 | 2.5 | 2" | 7/8" | Any Position | -15° to 400° | 0000000 | 00000 |
| 1/4 | 04 | 1/4 | 04 | 6 | 1.47 | 5,000 | 2.5 | 2" | 3/4" | Any Position | -30° to 200° | 0000000 | 000000 |
| 3/8 | 06 | 3/8 | 06 | 5 | 0.83 | 5,000 | 2.5 | 2 1/4" | 1 1/16" | Any Position | -15° to 400° | 0000000 | 000000 |
| 3/8 | 06 | 3/8 | 06 | 10 | 3.3 | 5,000 | 2.5 | 2 1/2" | 1" | Any Position | -30° to 200° | 0000000 | 000000 |
| 1/2 | 08 | 1/2 | 08 | 8 | 1.47 | 5,000 | 2.5 | 2 3/4" | 1 5/16" | Any Position | -15° to 400° | 0000000 | 000000 |
| 1/2 | 08 | 1/2 | 08 | 12 | 3.6 | 5,000 | 2.5 | 2 7/8" | 1 1/8" | Any Position | -30° to 200° | 0000000 | 000000 |
| 3/4 | 12 | 3/4 | 12 | 20 | 5.41 | 5,000 | 2.5 | 3 1/4" | 1 3/8" | Any Position | -30° to 200° | 0000000 | 000000 |
NPTF Male Inlet × NPTF Male Outlet—Ball Check Valve
NPTF — NPTF (Male)
Inlet Connection | Outlet Connection | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Pipe Size | Dash Size | Max. Flow Rate, gpm | Flow Coefficient (Cv) | Max. Pressure, psi | Min. Opening Pressure, psi | Seal Material | Port-to-Port Lg. | Hex Wd. | Mounting Orientation | Temp. Range, °F | Each | |
Brass Body | ||||||||||||||
| 1/8 | 02 | 1/8 | 02 | 1 | 0.17 | 2,000 | 2.5 | __ | 1" | 7/16" | Any Position | -30° to 190° | 00000000 | 000000 |
| 1/8 | 02 | 1/8 | 02 | 1 | 0.17 | 2,000 | 2.5 | Buna-N Rubber | 1" | 7/16" | Any Position | -30° to 190° | 00000000 | 00000 |
| 1/4 | 04 | 1/4 | 04 | 2.5 | 0.56 | 2,000 | 2.5 | __ | 1 3/8" | 5/8" | Any Position | -30° to 190° | 00000000 | 00000 |
| 1/4 | 04 | 1/4 | 04 | 2.5 | 0.56 | 2,000 | 2.5 | Buna-N Rubber | 1 3/8" | 5/8" | Any Position | -30° to 190° | 00000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 6 | 1.31 | 2,000 | 2.5 | __ | 1 5/8" | 3/4" | Any Position | -30° to 190° | 00000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 6 | 1.31 | 2,000 | 2.5 | Buna-N Rubber | 1 5/8" | 3/4" | Any Position | -30° to 190° | 00000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 10 | 2.71 | 2,000 | 2.5 | __ | 2 1/8" | 7/8" | Any Position | -30° to 190° | 00000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 10 | 2.71 | 2,000 | 2.5 | Buna-N Rubber | 2 1/8" | 7/8" | Any Position | -30° to 190° | 00000000 | 00000 |
| 3/4 | 12 | 3/4 | 12 | 15 | 3.4 | 2,000 | 2.5 | Buna-N Rubber | 2 1/4" | 1 1/8" | Any Position | -30° to 190° | 00000000 | 000000 |
Steel Body | ||||||||||||||
| 1/4 | 04 | 1/4 | 04 | 2.5 | 0.56 | 3,000 | 2.5 | __ | 1 3/8" | 5/8" | Any Position | -30° to 190° | 00000000 | 00000 |
| 1/4 | 04 | 1/4 | 04 | 2.5 | 0.56 | 3,000 | 2.5 | Buna-N Rubber | 1 3/8" | 5/8" | Any Position | -30° to 190° | 00000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 6 | 1.31 | 3,000 | 2.5 | __ | 1 5/8" | 3/4" | Any Position | -30° to 190° | 00000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 6 | 1.31 | 3,000 | 2.5 | Buna-N Rubber | 1 5/8" | 3/4" | Any Position | -30° to 190° | 00000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 10 | 2.71 | 3,000 | 2.5 | __ | 2 1/8" | 7/8" | Any Position | -30° to 190° | 00000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 10 | 2.71 | 3,000 | 2.5 | Buna-N Rubber | 2 1/8" | 7/8" | Any Position | -30° to 190° | 00000000 | 00000 |
303 Stainless Steel Body | ||||||||||||||
| 1/4 | 04 | 1/4 | 04 | 2.5 | 0.56 | 3,000 | 2.5 | __ | 1 3/8" | 5/8" | Any Position | -30° to 190° | 00000000 | 00000 |
| 1/4 | 04 | 1/4 | 04 | 2.5 | 0.56 | 3,000 | 2.5 | Buna-N Rubber | 1 3/8" | 5/8" | Any Position | -30° to 190° | 00000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 6 | 1.31 | 3,000 | 2.5 | Buna-N Rubber | 1 5/8" | 3/4" | Any Position | -30° to 190° | 00000000 | 000000 |