About Backflow-Prevention Valves
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Welding Gas Flashback Arresters for Regulators
Attach these arresters to the outlet connection of a regulator on a torch that cuts steel up to 11" thick. Arresters extinguish flames and have a check valve to stop reverse gas flow. They are reusable; resetting is not required after flashback.
Arresters with right-hand threads are for use with oxygen; arresters with left-hand threads are for use with acetylene, hydrogen, and propane.
Male Hose Connection | Female Hose Connection | |||||||
|---|---|---|---|---|---|---|---|---|
| Max. Pressure for Oxygen, psi | Thread Size  | Thread Type | Thread Size | Thread Type | Material | Specifications Met | Each | |
| 143 | 9/16"-18 | UNF | 9/16"-18 | UNF | Brass | EN 730, ISO 5175 | 00000000 | 000000 |
Max. Pressure, psi | Male Hose Connection | Female Hose Connection | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Acetylene | Hydrogen | Propane | Thread Size | Thread Type | Thread Size | Thread Type | Material | Specifications Met | Each | |
| 15 | 50 | 50 | 9/16"-18 | UNF | 9/16"-18 | UNF | Brass | EN 730, ISO 5175 | 00000000 | 000000 |
Max. Pressure, psi | Male Hose Connection | Female Hose Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oxygen | Acetylene | Hydrogen | Propane | Thread Size | Thread Type | Thread Size | Thread Type | Material | Specifications Met | Pair | |
| 143 | 15 | 50 | 50 | 9/16"-18 | UNF | 9/16"-18 | UNF | Brass | EN 730, ISO 5175 | 00000000 | 000000 |
Welding Gas Flashback Arresters for Torches
These arresters attach directly to torches that cut steel up to 8" thick. They extinguish flames and have a check valve to stop reverse gas flow. They are reusable; resetting is not required after flashback.
Arresters with right-hand threads are for use with oxygen; arresters with left-hand threads are for use with acetylene, hydrogen, and propane.
Male Hose Connection | Female Hose Connection | |||||||
|---|---|---|---|---|---|---|---|---|
| Max. Pressure for Oxygen, psi | Thread Size | Thread Type | Thread Size | Thread Type | Material | Specifications Met | Each | |
| 143 | 9/16"-18 | UNF | 9/16"-18 | UNF | Brass | EN 730, ISO 5175 | 00000000 | 000000 |
Max. Pressure, psi | Male Hose Connection | Female Hose Connection | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Acetylene | Hydrogen | Propane | Thread Size | Thread Type | Thread Size | Thread Type | Material | Specifications Met | Each | |
| 15 | 50 | 50 | 9/16"-18 | UNF | 9/16"-18 | UNF | Brass | EN 730, ISO 5175 | 00000000 | 000000 |
Max. Pressure, psi | Male Hose Connection | Female Hose Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oxygen | Acetylene | Hydrogen | Propane | Thread Size | Thread Type | Thread Size | Thread Type | Material | Specifications Met | Pair | |
| 143 | 15 | 50 | 50 | 9/16"-18 | UNF | 9/16"-18 | UNF | Brass | EN 730, ISO 5175 | 00000000 | 000000 |
Pipeline Flame Arresters
- For Use With: Butane, Natural Gas, Propane
- Flame-Arresting Element Material: 316 Stainless Steel
To prevent flashback in flammable gas pipelines, an internal flame-arresting element absorbs the heat from a fire to extinguish the flame. These valves are commonly used in pilot lines connected to waste gas burners.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | Max. Pressure | Max. Temperature, °F | End-to-End Lg. | Each | |
Aluminum Body | |||||
|---|---|---|---|---|---|
NPT Female | |||||
| 1/4 | 25 psi @ 176° F | 176° | 3" | 0000000 | 0000000 |
| 1/2 | 25 psi @ 176° F | 176° | 3 3/4" | 0000000 | 000000 |
| 3/4 | 25 psi @ 176° F | 176° | 3 3/4" | 0000000 | 000000 |
| 1 | 25 psi @ 176° F | 176° | 3 3/4" | 0000000 | 000000 |
| 1 1/2 | 25 psi @ 176° F | 176° | 3 3/4" | 0000000 | 000000 |
| 2 | 25 psi @ 176° F | 176° | 4 3/4" | 0000000 | 000000 |
Arresters for Flammable Vapors
Minimize fire hazard from flammable vapors. Mount an arrester to your vent pipe to stop flames from traveling back into your tank. If the ambient temperature reaches 165° F, the fusible links melt, and the cover closes to block flames from the arrester. To reuse the arrester, replace the fusible links (sold separately).
For technical drawings and 3-D models, click on a part number.