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About Backflow-Prevention Valves
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Butt-Weld Check Valves
- For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
- Piston Material: 316 Stainless Steel
- Spring Material: 316 Stainless Steel
- Seal Material: Viton® Fluoroelastomer
Weld these valves to unthreaded pipe for a smooth, flush connection that provides maximum flow. All open to allow flow in one direction and close when flow stops or reverses. They have a 316 stainless steel body for excellent 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.
| Pipe Size  | For Pipe Schedule | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Specifications Met | Each | |
316 Stainless Steel Body | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Butt Weld × Butt Weld | |||||||||
| 1/2 | 40 | 2.4 | 1,500 psi @ 100° F | 0.5 | -10° to 400° | 2 3/16" | ANSI/ASME B16.25 | 0000000 | 0000000 |
| 3/4 | 40 | 4.4 | 1,500 psi @ 100° F | 0.5 | -10° to 400° | 2 11/16" | ANSI/ASME B16.25 | 0000000 | 000000 |
| 1 | 40 | 6.1 | 1,500 psi @ 100° F | 0.5 | -10° to 400° | 2 15/16" | ANSI/ASME B16.25 | 0000000 | 000000 |
| 1 1/2 | 40 | 18.8 | 1,500 psi @ 100° F | 0.5 | -10° to 400° | 3 15/16" | ANSI/ASME B16.25 | 0000000 | 000000 |
| 2 | 40 | 32 | 1,500 psi @ 100° F | 0.5 | -10° to 400° | 4 3/8" | ANSI/ASME B16.25 | 0000000 | 000000 |