Torch Check Valves | McMaster-Carr

	For Use With For Use With

	Thread Type Thread Type

UNF

NPT

	Thread Size Thread Size

3/8"-24

9/16"-18

	Gender Gender

Male

Female

	Thread Direction Thread Direction

Right Hand

Left Hand

	Connection Type Connection Type


Hose	Pipe

	Component Component

Check Valve

Flashback Arrester

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant with
Exemptions

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Maximum Pressure for Oxygen Maximum Pressure for Oxygen

125 psi

143 psi

	Maximum Pressure for Acetylene Maximum Pressure for Acetylene

15 psi

50 psi

	Specifications Met Specifications Met

EN 730

ISO 5175

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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12 Products

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.

With Right-Hand Threads

	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

With Left-Hand Threads

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

With Right-Hand and Left-Hand Threads

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.

With Right-Hand Threads

	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

With Left-Hand Threads

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

With Right-Hand and Left-Hand Threads

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 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
Oxygen	Acetylene	Hydrogen	Propane	Thread Direction	Thread Size	Thread Type	Thread Direction	Thread Size	Thread Type	Material		Each
125	__	__	__	Right Hand	3/8"-24	UNF	Right Hand	3/8"-24	UNF	Brass	000000	000000
125	__	__	__	Right Hand	9/16"-18	UNF	Right Hand	9/16"-18	UNF	Brass	000000	00000
__	50	50	50	Left Hand	3/8"-24	UNF	Left Hand	3/8"-24	UNF	Brass	000000	00000
__	50	50	50	Left Hand	9/16"-18	UNF	Left Hand	9/16"-18	UNF	Brass	000000	00000

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
Oxygen	Acetylene	Hydrogen	Propane	Thread Direction	Thread Size	Thread Type	Thread Direction	Pipe Size	Thread Type	Material		Each
125	__	__	__	Right Hand	9/16"-18	UNF	Right Hand	1/4	NPT	Brass	000000	000000
__	50	50	50	Right Hand	9/16"-18	UNF	Left Hand	1/4	NPT	Brass	000000	00000