Reducers for Acetylene | McMaster-Carr

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8 Products

About Pressure-Regulating Valves

Find a regulator that’s compatible with your gas, matches the CGA number on your tank, and has twice the operating pressure of your application’s normal range.

Tank-Mount Pressure-Regulating Valves for Fuel Gases

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


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

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.

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

Stainless Steel Diaphragm—Valves with a stainless steel diaphragm can withstand harsh environments.

	Inlet				Outlet					Material
	CGA No.	Location	Thread Direction	Pressure Gauge Reading Range, psi	Thread Size	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm	Temp. Range, ° F		Each
For Acetylene







				UNF Male Outlet × NGO Female Inlet

				300	Side	Right Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Rubber	-20 to 120	7897A2	0000000


				300	Side	Right Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	Knob	Brass/Steel	PTFE	Rubber	-20 to 120	7897A62	000000




						UNF Male Outlet × NGO Male Inlet

						510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Rubber	-20 to 120	7897A7	000000


						510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	7897A53	000000
						510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	Knob	Brass/Steel	PTFE	Rubber	-20 to 120	7897A63	000000

Two Stage


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

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.

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

	Inlet				Outlet					Material
	CGA No.	Location	Thread Direction	Pressure Gauge Reading Range, psi	Thread Size	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm	Temp. Range, ° F		Each
For Acetylene







				UNF Male Outlet × NGO Female Inlet

				300	Side	Right Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass/Steel	PTFE	Rubber	-20 to 120	7897A4	0000000




						UNF Male Outlet × NGO Male Inlet

						510	Side	Left Hand	0 to 400	9/16"-18	Side	Left Hand	0 to 15	T-Handle	Brass/Steel	PTFE	Rubber	-20 to 120	7897A14	000000

Pressure-Regulating Valves for Fuel Gases

With Knob

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					Lg.
	For Use With	Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pressure Adjustment Method	Pressure Gauge Measurement Range, psi	Temp. Range, ° F	End-to-End	Port-to-Port		Each
NPT Female







				Brass Body—Stainless Steel Diaphragm and Neoprene Seal

				Acetylene	1/4	Side	350	1/4	Bottom, Side	Knob	0 to 30	-20 to 120	3.600"	1.32"	7864A14	0000000