Valves for Acetylene | McMaster-Carr

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29 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

About Gas Regulators

Use these couplings to quickly link and unlink welding hoses, torches, and pressure regulators. They consist of a plug and socket that are sold together as a set of two—you’ll get one right-hand connection for oxygen and one left-hand connection for fuel gas. The connections are noninterchangeable and color coded so you can’t mix lines. The male threaded ends attach to threaded welding hose, and the female threaded ends attach to a torch or pressure regulator. To connect couplings, push the plug into the socket; the sleeve on the socket has a spring-loaded lock for gas-tight connections. To disconnect, pull back on the socket sleeve and twist to release the plug. The sockets have a shut-off valve that stops the flow when the coupling is separated so gas won’t leak from the line. The sockets also have a built-in check valve to prevent gas backflow. Couplings are also known as CGA (Compressed Gas Association) couplings. They are brass for good corrosion resistance.

Couplings with left-hand threads are identified with a notch in the nut.

Note: Couplings have a CGA number that corresponds to a specific type of gas. Make sure the CGA number of the coupling matches the CGA number of your tank and other system components.

For technical drawings and 3-D models, click on a part number.

Brass Plug and Socket Sets, Male Hose × Female Torch

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F
Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed

Includes	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	For Use With		Each
One CGA 022 Coupling Adapter (Male Hose Plug × Female Torch Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Female Torch Socket)	B	9/16"-18	UN/UNF (CGA)	Right Hand (CGA 022), Left Hand (CGA 023)	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	000000	000000

Brass Plug and Socket Sets, Male Hose × Female Regulator

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F
Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed

Includes	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	For Use With		Each
One CGA 022 Coupling Adapter (Male Hose Plug × Female Regulator Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Female Regulator Socket)	B	9/16"-18	UN/UNF (CGA)	Right Hand (CGA 022), Left Hand (CGA 023)	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	000000	0000000

Brass Plug and Socket Sets, Male Hose × Male Hose

Maximum Pressure: 200 psi @ 72° F
Maximum Temperature: 120° F
Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed

Includes	Gas Fitting Size	Thread Size	Thread Type	Thread Direction	For Use With		Each
One CGA 022 Coupling Adapter (Male Hose Plug × Male Hose Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Male Hose Socket)	B	9/16"-18	UN/UNF (CGA)	Right Hand (CGA 022), Left Hand (CGA 023)	Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane	000000	0000000

Tank-Mount Pressure-Regulating Valves for Fuel Gases

For Use With: See Table
Temperature Range: -20° to 120° F

Attach these valves to acetylene, hydrogen, methane, propane, or propylene tanks to reduce a high inlet pressure to a lower, stable outlet pressure. They have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Valves come with a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank.

Choose a valve with a maximum outlet pressure that’s approximately twice your application’s normal operating pressure. Your operating pressure should never exceed 75% of the valve’s maximum outlet pressure.

Single-stage valves reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank. They’re best for applications where a constant outlet pressure isn’t critical.

Two-stage valves progressively reduce pressure over two steps for more consistent outlet pressure at all times. They’re often used in applications that require a constant outlet pressure regardless of the tank level.

Valves with a brass body have a longer service life than valves with a brass and steel body.

Valves with a stainless steel diaphragm can withstand harsh environments.

Single-Stage Valves

Male Outlet × Female Inlet Single-Stage Valve With Knob

Male Outlet × Female Inlet Single-Stage Valve With T-Handle

Male Outlet × Male Inlet Single-Stage Valve With Knob

Male Outlet × Male Inlet Single-Stage Valve With T-Handle

Inlet				Outlet					Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Thread Size	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm		Each
For Use With Acetylene
UNF Male Outlet × NGO Female Inlet
CGA 300	Side	Right Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	Knob	Brass/Steel	PTFE	Rubber	0000000	0000000
CGA 300	Side	Right Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Rubber	000000	000000
UNF Male Outlet × NGO Male Inlet
CGA 510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	Knob	Brass/Steel	PTFE	Rubber	0000000	000000
CGA 510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Rubber	000000	000000
CGA 510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Stainless Steel	0000000	000000

Two-Stage Valves

Male Outlet × Female Inlet Two-Stage Valve With T-Handle

Male Outlet × Male Inlet Two-Stage Valve With T-Handle

Inlet				Outlet					Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Thread Size	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm		Each
For Use With Acetylene
UNF Male Outlet × NGO Female Inlet
CGA 300	Side	Right Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Stainless Steel	0000000	0000000
CGA 300	Side	Right Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass/Steel	PTFE	Rubber	000000	000000
UNF Male Outlet × NGO Male Inlet
CGA 510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Stainless Steel	0000000	000000
CGA 510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass/Steel	PTFE	Rubber	0000000	000000

Pressure-Regulating Valves for Fuel Gases

With Knob

For Use With: See Table
Temperature Range: See Table

Install these valves directly in gas distribution pipelines for acetylene, hydrogen, or propane. They automatically reduce a high inlet pressure to a lower, stable outlet pressure. Valves have two outlets to fit various pipe configurations and come with a plug to close the unused outlet. The gauge monitors outlet pressure. All valves are single stage and reduce pressure in one step, which causes the outlet pressure to fluctuate.

	Inlet			Outlet
For Use With	Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pressure Gauge Range, psi	Temperature Range, ° F	End-to-End Lg.	Port-to-Port Lg.		Each
NPT Female
Brass Body—Neoprene/Nylon Diaphragm and Neoprene Seal
Acetylene	1/4	Side	350	1/4	Bottom, Side	0 to 30	-20° to 120°	2.60"	1.32"	0000000	0000000

Welding Gas Flashback Arresters for Torches

Standard and High Flow

Quick Disconnect

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.

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 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.

With Left-Hand Threads

Male Hose Connection		Female Hose Connection		Max. Pressure, psi
Thread Size	Thread Type	Thread Size	Thread Type	Acetylene	Hydrogen	Propane	Material	Specifications Met		Each
Standard
9/16"-18	UNF	9/16"-18	UNF	15	50	50	Brass	EN 730, ISO 5175	00000000	000000
High Flow
3/8"-24	UNF	3/8"-24	UNF	15	50	50	Brass	EN 730, ISO 5175	0000000	00000
9/16"-18	UNF	9/16"-18	UNF	15	50	50	Brass	EN 730, ISO 5175	00000000	000000
7/8"-14	UNF	7/8"-14	UNF	15	50	50	Brass	EN 730, ISO 5175	00000000	000000
Quick Disconnect
9/16"-18	UNF	9/16"-18	UNF	15	50	72	Brass	EN 561, ISO 7289	00000000	00000

With Right-Hand and Left-Hand Threads

Male Hose Connection		Female Hose Connection		Max. Pressure, psi
Thread Size	Thread Type	Thread Size	Thread Type	Oxygen	Acetylene	Hydrogen	Propane	Material	Specifications Met		Pair
Standard
9/16"-18	UNF	9/16"-18	UNF	143	15	50	50	Brass	EN 730, ISO 5175	00000000	0000000

Welding Gas Flashback Arresters for Regulators

Standard and High Flow

Quick Disconnect

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.

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 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.

Left-Hand Threads—UNF Male × UNF Female

	Max. Pressure, psi
Thread Size	Acetylene	Hydrogen	Propane	Material	Specifications Met		Each
Standard
3/8"-24	15	50	50	Brass	EN 730, ISO 5175	0000000	000000
9/16"-18	15	50	50	Brass	EN 730, ISO 5175	00000000	00000
High Flow
9/16"-18	15	50	50	Brass	EN 730, ISO 5175	00000000	000000
7/8"-14	15	50	50	Brass	EN 730, ISO 5175	00000000	000000
Quick Disconnect
9/16"-18	15	50	50	Brass	EN 561, ISO 7289	00000000	000000

Left-Hand Threads—NPT Female × NPT Female

	Max. Pressure, psi
Pipe Size	Acetylene	Hydrogen	Propane	Material	Specifications Met		Each
Standard
1/4	15	50	50	Brass	EN 730, ISO 5175	00000000	0000000

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

	Max. Pressure, psi
Thread Size	Oxygen	Acetylene	Hydrogen	Propane	Material	Specifications Met		Pair
Standard
9/16"-18	143	15	50	50	Brass	EN 730, ISO 5175	00000000	0000000

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	000000	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
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	000000	000000
50	50	50	Left Hand	9/16"-18	UNF	Left Hand	9/16"-18	UNF	Brass	000000	00000

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