CGA 540 Welding Gas Regulators

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Inlet CGA Number

For Use With

Outlet Pressure

Maximum Outlet Pressure Gauge Measurement

Maximum Inlet Pressure

Number of Stages

Inlet Gender

Outlet Gender

Body Material

Outlet Pressure Adjustment Method

Knob

T-Handle

Outlet Connection Port

Diaphragm Material

Outlet Thread Type

Outlet Thread Direction

Left Hand

Right Hand

Number of Gauge Ports

Outlet Connection

Thread Type

Maximum Inlet Pressure Gauge Reading

4,000 psi

Gender

Female

Male

DFARS Specialty Metals

Exempt

REACH

Compliant

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

RoHS

Not Compliant

Export Control Classification Number (ECCN)

EAR99

Inlet Connection Port

Inlet Thread Size

16 Products

Tank-Mount Pressure-Regulating Valves for Air and Inert Gas

These valves automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. All 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 have 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


UNF Male Outlet × Female Inlet Single-Stage Valves with T-Handle	UNF Male Outlet × Female Inlet Single-Stage Valves 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	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm	Temp. Range, ° F		Each
For Oxygen







				9/16"-18 UNF Male Outlet × NGO Female Inlet

				540	Side	Right Hand	0 to 4,000	Side	Left Hand	0 to 50	Knob	Brass	PTFE	Neoprene	-20 to 120	3687N111	0000000


				540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	3687N116	000000
				540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Rubber	-20 to 120	7897A31	000000
				540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	7897A51	000000
				540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 145	Knob	Brass/Steel	PTFE	Rubber	-20 to 120	7897A61	000000
				540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 200	T-Handle	Brass	PTFE	Rubber	-20 to 120	7897A1	000000
				540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 200	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	3687N118	000000

Two Stage


NPT Female Outlet × Female Inlet Two-Stage Valves with T-Handle	UNF Male Outlet × Female Inlet Two-Stage Valves 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.

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	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm	Temp. Range, ° F		Each
For Oxygen







				1/4 NPT Female Outlet × NGO Female Inlet

				540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Neoprene	-20 to 120	3687N12	0000000


				540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	7897A75	000000




						9/16"-18 UNF Male Outlet × NGO Female Inlet

						540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Neoprene	-20 to 120	3687N119	000000


						540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	3687N125	000000
						540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass/Steel	PTFE	Rubber	-20 to 120	7897A3	000000
						540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	7897A74	000000

Tank-Mount High-Pressure-Regulating Valves for Air and Inert Gas

Often used for pressure-vessel testing and other high-pressure applications, these valves can handle at least seven times the outlet pressure of standard tank-mount pressure-regulating valves. They automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. All 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. Outlet fittings are Swagelok® for a leak-free seal around hard metal tubing in high-pressure lines. Also known as instrumentation fittings, Swagelok® fittings are compatible with Parker A-Lok, Gyrolok, Bilok, and Tylok fittings. Valves have a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank. They are single stage and reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank.

For Oxygen

Female Outlet × Female

Inlet Straight With Knob

	Inlet					Outlet					Material
	CGA No.	Location	Thread Direction	Pressure Gauge Reading Range, psi	No. of Stages	For Tube OD	Location	Pressure Range, psi	Pressure Adjustment Method	Shape	Body	Seal	Diaphragm	Temp. Range, ° F		Each
NGO Female Inlet × Swagelok® Female Outlet



		540	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 1,500	Knob	Straight	Brass	PCTFE	Neoprene	-20 to 120	6677A17	0000000


		540	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 2,500	Knob	Straight	Brass	PCTFE	Neoprene	-20 to 120	6677A18	000000

Tank-Mount Pressure-Regulating Valves for Cryogenic Cylinders

Automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. These valves can remove gases from liquid cryogenic cylinders. 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. They are single stage and reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank.

		Inlet				Outlet
	For Use With	CGA No.	Location	Thread Direction	No. of Stages	Thread Size	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Temp. Range, ° F		Each
UNF Male Outlet × NGO Female Inlet







				Brass Body—Stainless Steel Diaphragm and PTFE Seal

				Oxygen	540	Side	Right Hand	Single	9/16"-18	Bottom	Right Hand	0 to 125	T-Handle	-20 to 120	7897A84	0000000