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About Backflow-Prevention Valves
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Vacuum-Breaking Valves
Also known as vacuum breakers, these valves have vents that open when pressure drops to relieve vacuum conditions and prevent backward suction from drawing liquid into upstream piping.
303 stainless steel valves have the best corrosion resistance.
Straights are often used with steam coils, heat exchangers, and space heaters.
NPT Female
Outlet Straight
Unthreaded
Female Outlet
- For Use With: Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon
- Seal Material: EPR Rubber
303 Stainless Steel Body | |||||||
|---|---|---|---|---|---|---|---|
| Inlet Pipe Size  | Outlet Pipe Size | For Outlet Tube OD | Max. Pressure | Temperature Range, °F | End-to-End Lg. | Each | |
NPT Male Inlet × NPT Female Outlet | |||||||
| 1/2 | 3/8 | __ | 300 psi @ 70° F | -20° to 365° | 1 3/4" | 0000000 | 0000000 |
| 3/4 | 1/2 | __ | 300 psi @ 70° F | -20° to 365° | 2 1/8" | 0000000 | 000000 |
| 1 | 3/4 | __ | 300 psi @ 70° F | -20° to 365° | 2 3/8" | 0000000 | 000000 |
NPT Male Inlet × Unthreaded Female Outlet | |||||||
| 1/2 | __ | 11/16" | 300 psi @ 70° F | -20° to 365° | 1 3/4" | 0000000 | 000000 |
| 3/4 | __ | 13/16" | 300 psi @ 70° F | -20° to 365° | 2 1/8" | 0000000 | 000000 |
| 1 | __ | 1 1/16" | 300 psi @ 70° F | -20° to 365° | 2 3/8" | 0000000 | 000000 |
High-Pressure Vacuum-Breaking Valves
- For Use With: Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon
- Seal Material: Fluoroelastomer Rubber
Rated for 12 times the pressure of standard vacuum-breaking valves, these can handle up to 1,500 psi. Also known as vacuum breakers, they have vents that open when pressure drops to relieve vacuum conditions and prevent backward suction from drawing liquid into upstream piping. Body is 316 stainless steel 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.