About Backflow-Prevention Valves
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Threaded Check Valves
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.
316 stainless steel valves have the best 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.
- For Use With: See table
- Spring Material: See table
- Seal Material: See table
| Pipe Size  | Flow Coefficient (Cv) | Max. Pressure | Max. Steam Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Spring Material | Seal Material | End-to-End Lg. | For Use With | Each | |
Brass Body—Buna-N Rubber Spring-Loaded Piston | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/8 | 2 | 400 psi @ 70° F | __ | 2 | 35° to 225° | 302 Stainless Steel | Buna-N Rubber | 2 5/8" | Air; Argon; Helium; Krypton; Neon; Oil; Water; Xenon | 00000000 | 000000 |
| 1/2 | 4 | 400 psi @ 70° F | __ | 2 | 35° to 225° | 302 Stainless Steel | Buna-N Rubber | 2 11/16" | Air; Argon; Helium; Krypton; Neon; Oil; Water; Xenon | 00000000 | 00000 |
| 3/4 | 6 | 400 psi @ 70° F | __ | 2 | 35° to 225° | 302 Stainless Steel | Buna-N Rubber | 3 5/16" | Air; Argon; Helium; Krypton; Neon; Oil; Water; Xenon | 00000000 | 00000 |
| 1 | 13 | 400 psi @ 70° F | __ | 2 | 35° to 225° | 302 Stainless Steel | Buna-N Rubber | 3 11/16" | Air; Argon; Helium; Krypton; Neon; Oil; Water; Xenon | 00000000 | 00000 |
316 Stainless Steel Body—Fluoroelastomer Rubber Spring-Loaded Piston | |||||||||||
| 1/4 | 1.1 | 3,000 psi @ 70° F | __ | 2 | -5° to 350° | 316 Stainless Steel | Fluoroelastomer Rubber | 2 5/8" | Air; Argon; Helium; Krypton; Neon; Water; Xenon | 0000000 | 00000 |
| 3/8 | 3.1 | 3,000 psi @ 70° F | __ | 2 | -5° to 350° | 316 Stainless Steel | Fluoroelastomer Rubber | 2 5/8" | Air; Argon; Helium; Krypton; Neon; Water; Xenon | 0000000 | 00000 |
| 1/2 | 3.8 | 3,000 psi @ 70° F | __ | 2 | -5° to 350° | 316 Stainless Steel | Fluoroelastomer Rubber | 2 5/8" | Air; Argon; Helium; Krypton; Neon; Water; Xenon | 0000000 | 00000 |
| 3/4 | 7.4 | 3,000 psi @ 70° F | __ | 2 | -5° to 350° | 316 Stainless Steel | Fluoroelastomer Rubber | 3 5/16" | Air; Argon; Helium; Krypton; Neon; Water; Xenon | 0000000 | 00000 |
| 1 | 11.2 | 3,000 psi @ 70° F | __ | 2 | -5° to 350° | 316 Stainless Steel | Fluoroelastomer Rubber | 3 11/16" | Air; Argon; Helium; Krypton; Neon; Water; Xenon | 0000000 | 00000 |
316 Stainless Steel Body—316 Stainless Steel Spring-Loaded Piston | |||||||||||
| 1/8 | 1.85 | 580 psi @ 350° F | 150 psi @ 212° F | 4 | 0° to 355° | 302 Stainless Steel | Fluoroelastomer Rubber | 2" | Air; Argon; Helium; Krypton; Neon; Steam; Water; Xenon | 0000000 | 000000 |
| 1/4 | 1.954 | 580 psi @ 350° F | 150 psi @ 212° F | 4 | 0° to 355° | 302 Stainless Steel | Fluoroelastomer Rubber | 2" | Air; Argon; Helium; Krypton; Neon; Steam; Water; Xenon | 0000000 | 000000 |
| 3/8 | 3.48 | 580 psi @ 350° F | 150 psi @ 212° F | 4 | 0° to 355° | 302 Stainless Steel | Fluoroelastomer Rubber | 2 5/8" | Air; Argon; Helium; Krypton; Neon; Steam; Water; Xenon | 0000000 | 000000 |
| 1/2 | 3.584 | 580 psi @ 350° F | 150 psi @ 212° F | 4 | 0° to 355° | 302 Stainless Steel | Fluoroelastomer Rubber | 2 13/16" | Air; Argon; Helium; Krypton; Neon; Steam; Water; Xenon | 0000000 | 000000 |
| 3/4 | 6.463 | 580 psi @ 350° F | 150 psi @ 212° F | 4 | 0° to 355° | 302 Stainless Steel | Fluoroelastomer Rubber | 3 5/16" | Air; Argon; Helium; Krypton; Neon; Steam; Water; Xenon | 0000000 | 000000 |
| 1 | 9.088 | 580 psi @ 350° F | 150 psi @ 212° F | 4 | 0° to 355° | 302 Stainless Steel | Fluoroelastomer Rubber | 3 9/16" | Air; Argon; Helium; Krypton; Neon; Steam; Water; Xenon | 0000000 | 000000 |
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.
PVC and CPVC valves come with unthreaded socket-connect female fittings in addition to the threaded NPT female fittings.
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:
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
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.
For technical drawings and 3-D models, click on a part number.
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 | |
Steel Body | |||||||||||||
| 1/4 | 04 | 1/4 | 04 | 6 | 1.47 | 5,000 | 2.5 | 2" | 3/4" | Any Position | -30° to 200° | 000000 | 000000 |
| 3/8 | 06 | 3/8 | 06 | 10 | 3.3 | 5,000 | 2.5 | 2 1/2" | 1" | Any Position | -30° to 200° | 000000 | 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° | 000000 | 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° | 000000 | 00000 |