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About Backflow-Prevention Valves
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Threaded Check Valves for Vacuum
- For Use With: Air
- Ball Material: Acetal Plastic
- Spring Material: Stainless Steel
- Seal Material: Buna-N Rubber
Prevent vacuum loss with these airtight, leakproof valves. They 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.
| Pipe Size  | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Vacuum Rating, in. of Hg | Each | |
Anodized Aluminum Body | ||||||||
|---|---|---|---|---|---|---|---|---|
NPT Female × NPT Female | ||||||||
| 1/4 | 1.15 | 230 psi @ 200° F | 0.28 | 0° to 200° | 1 3/8" | 0.58 | 000000 | 000000 |
| 3/8 | 4.7 | 230 psi @ 200° F | 0.3 | 0° to 200° | 2 1/8" | 0.6 | 000000 | 00000 |
| 1/2 | 4.7 | 230 psi @ 200° F | 0.3 | 0° to 200° | 2 1/8" | 0.6 | 000000 | 00000 |
| 1 1/4 | 28 | 230 psi @ 200° F | 0.07 | 0° to 200° | 3 3/8" | 0.14 | 000000 | 00000 |
| 2 | 63 | 230 psi @ 200° F | 0.17 | 0° to 200° | 5" | 0.35 | 000000 | 000000 |
Check Valves with Barbed Fittings for Vacuum
- For Use With: Air, Water
- Disc Material: Neoprene Rubber
- Seal Material: Polyethylene Plastic
Barbs grip onto tubing, providing a secure hold to prevent vacuum loss in tubing lines. These valves open to allow flow in one direction and close when flow stops or reverses.