Check Valves for Hydrogen

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Maximum Pressure for Propane

50 psi

72 psi

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Maximum Pressure for Oxygen

143 psi

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16 Products

Welding Gas Check Valves for Regulators

Stop the reverse flow of gas in your regulator. Check valves do not stop flashbacks.

Max. Pressure, psi			Male Hose Connection			Male Pipe Connection
Acetylene	Hydrogen	Propane	Thread Direction	Thread Size	Thread Type	Thread Direction	Pipe Size	Thread Type	Material		Each
50	50	50	Right Hand	9/16"-18	UNF	Left Hand	1/4	NPT	Brass	7957A4	000000

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.

Left-Hand Threads—UNF Male × UNF Female


Standard Flashback Arresters	High Flow Flashback Arresters	Quick Disconnect Flashback Arresters

Arresters with left-hand threads are for use with acetylene, hydrogen, and propane.

High Flow Flashback Arresters—High-flow arresters give you twice the airflow rate compared to standard flashback arresters when they’re used at the same inlet pressure. They are often used with larger torch tips.

Quick Disconnect Flashback Arresters—Quick-disconnect arresters have a fitting that connects and disconnects them from your torch, so you don't have to thread these arresters on and off with a wrench.

		Max. Pressure, psi
	Thread Size	Acetylene	Hydrogen	Propane	Material	Specs. Met		Each
Standard Flashback Arresters



		3/8"-24	15	50	50	Brass	EN 730, ISO 5175	7942A52	000000


		9/16"-18	15	50	50	Brass	EN 730, ISO 5175	78335A25	00000


		High Flow Flashback Arresters



				9/16"-18	15	50	50	Brass	EN 730, ISO 5175	78335A28	000000


				7/8"-14	15	50	50	Brass	EN 730, ISO 5175	78335A51	000000


				Quick Disconnect Flashback Arresters



						9/16"-18	15	50	50	Brass	EN 561, ISO 7289	78335A55	000000

Right-Hand and Left-Hand Threads—UNF Male × UNF Female

Standard

Flashback

Arresters

Arresters with right-hand threads are for use with oxygen.

Arresters with left-hand threads are for use with acetylene, hydrogen, and propane.

		Max. Pressure, psi
	Thread Size	Oxygen	Acetylene	Hydrogen	Propane	Material	Specs. Met		Pair
Standard Flashback Arresters



		9/16"-18	143	15	50	50	Brass	EN 730, ISO 5175	78335A43	0000000

Left-Hand Threads—NPT Female × NPT Female

Standard

Flashback

Arresters

Arresters with left-hand threads are for use with acetylene, hydrogen, and propane.

		Max. Pressure, psi
	Pipe Size	Acetylene	Hydrogen	Propane	Material	Specs. Met		Each
Standard Flashback Arresters



		1/4	15	50	50	Brass	EN 730, ISO 5175	78335A54	0000000

Welding Gas Check Valves for Torches

Stop the reverse flow of gas in your torch. Check valves do not stop flashbacks.

Max. Pressure, psi			Male Hose Connection			Female Hose Connection
Acetylene	Hydrogen	Propane	Thread Direction	Thread Size	Thread Type	Thread Direction	Thread Size	Thread Type	Material		Each
50	50	50	Left Hand	3/8"-24	UNF	Left Hand	3/8"-24	UNF	Brass	7957A8	000000
50	50	50	Left Hand	9/16"-18	UNF	Left Hand	9/16"-18	UNF	Brass	7957A2	00000

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.

Left-Hand Threads—UNF Male × UNF Female


Standard Flashback Arresters	High Flow Flashback Arresters	Quick Disconnect Flashback Arresters

Arresters with left-hand threads are for use with acetylene, hydrogen, and propane.

		Max. Pressure, psi
	Thread Size	Acetylene	Hydrogen	Propane	Material	Specs. Met		Each
Standard Flashback Arresters



		9/16"-18	15	50	50	Brass	EN 730, ISO 5175	78335A22	000000


		High Flow Flashback Arresters



				3/8"-24	15	50	50	Brass	EN 730, ISO 5175	7942A12	00000


				9/16"-18	15	50	50	Brass	EN 730, ISO 5175	78335A46	000000
				7/8"-14	15	50	50	Brass	EN 730, ISO 5175	78335A48	000000


				Quick Disconnect Flashback Arresters



						9/16"-18	15	50	72	Brass	EN 561, ISO 7289	78335A24	00000

Right-Hand and Left-Hand Threads—UNF Male × UNF Female

Standard

Flashback

Arresters

Arresters with right-hand threads are for use with oxygen.

Arresters with left-hand threads are for use with acetylene, hydrogen, and propane.

		Max. Pressure, psi
	Thread Size	Oxygen	Acetylene	Hydrogen	Propane	Material	Specs. Met		Pair
Standard Flashback Arresters



		9/16"-18	143	15	50	50	Brass	EN 730, ISO 5175	78335A41	0000000