CGA 320 Welding Gas Regulators

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Inlet CGA Number

For Use With

Outlet Pressure

Maximum Outlet Pressure Gauge Measurement

Outlet Connection

Maximum Inlet Pressure

3,000 psi

Number of Stages

Single

Two

Outlet Connection Port

Outlet Gender

Seal Material

Outlet Thread Size

Maximum Inlet Pressure Gauge Reading

4,000 psi

Inlet Pressure Gauge Included

Inlet Thread Type

Outlet Thread Type

Inlet Thread Size

Inlet Gender

Number of Gauge Ports

Inlet Connection Port

Hose

RoHS

Not Compliant

REACH

Compliant

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

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

Thread Size

Outlet Pressure Adjustment Method

19 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


Female Outlet × Female Inlet Single-Stage Valves with Knob	UNF Male Outlet × Female Inlet Single-Stage Valves with T-Handle

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.

	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 Carbon Dioxide







				5/8"-18 UNF Female Outlet × NGO Female Inlet

				320	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 145	Knob	Brass	PTFE	Neoprene	-20 to 120	3687N112	0000000




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

						320	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Rubber	-20 to 120	7897A39	000000

Two Stage


NPT Female Outlet × Female Inlet Two-Stage Valves with T-Handle	UNF Female Outlet x 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 Carbon Dioxide







				1/4 NPT Female Outlet × NGO Female Inlet

				320	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Neoprene	-20 to 120	3687N124	0000000


				320	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	3687N129	000000




						5/8"-18 UNF Female Outlet × NGO Female Inlet

						320	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass/Steel	PTFE	Rubber	-20 to 120	7897A17	000000

High-Purity Tank-Mount Pressure-Regulating Valves for Inert Gas

Reduce contaminants in research sample systems, emission monitoring systems, chromatography, and other high-purity applications that use argon, helium, nitrogen, or carbon dioxide. These valves have a 316 stainless steel and brass body with a smooth finish to reduce dust collection and internal components designed to protect the seal and diaphragm from contamination. 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.

For Carbon Dioxide


Swagelok® Female Outlet × NGO Female Inlet (Brass)	Swagelok® Female Outlet × NGO Female Inlet (Chrome-Plated Brass)

Chrome-Plated Brass Body—Chrome-plated valves add a layer of corrosion resistance.

Single Stage—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—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.

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







				Brass Body—316 Stainless Steel Diaphragm and PTFE Seal

				320	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 15	Knob	-20 to 120	7951A72	0000000


				320	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 125	Knob	-20 to 120	7951A73	000000
				320	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 125	Knob	-20 to 120	7951A69	000000




						Chrome-Plated Brass Body—316 Stainless Steel Diaphragm and PTFE Seal

						320	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 15	Knob	-20 to 120	7951A63	000000


						320	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 50	Knob	-20 to 120	7951A34	000000
						320	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 15	Knob	-20 to 120	7951A66	000000
						320	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 50	Knob	-20 to 120	7951A67	000000
						320	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 125	Knob	-20 to 120	7951A68	000000

Tank-Mount Pressure-Regulating Valves with Flowmeter for Inert Gas

Commonly used in TIG welding where gas flow/coverage is a concern, these valves measure the gas flow rate in addition to regulating pressure. 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. Valves have a gauge to monitor the outlet flow rate and a second 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 Carbon Dioxide


Female Outlet × Female Inlet	Female Outlet × Female Inlet with Hose

	Inlet					Outlet					Material
	CGA No.	Location	Thread Direction	Pressure Gauge Reading Range, psi	No. of Stages	Thread Size	Location	Thread Direction	Flow Range, scfh	Flow Gauge Included	Body	Seal	Diaphragm	Includes	Temp. Range, ° F		Each
UNF Female Outlet × NGO Female Inlet



		320	Side	Right Hand	0 to 4,000	Single	5/8"-18	Side	Right Hand	0 to 60	Yes	Brass	PTFE	Neoprene	—	-20 to 120	7997A66	0000000


		320	Side	Right Hand	0 to 4,000	Single	5/8"-18	Side	Right Hand	0 to 60	Yes	Brass	PTFE	Neoprene	10-ft. long, 3/16" dia. hose with 5/8"-18 male fittings on both ends	-20 to 120	7997A68	000000
		320	Side	Right Hand	0 to 4,000	Single	5/8"-18	Side	Right Hand	0 to 100	Yes	Brass	PTFE	Neoprene	—	-20 to 120	7997A51	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

				Carbon Dioxide	320	Side	Right Hand	Single	9/16"-18	Bottom	Right Hand	0 to 350	T-Handle	-20 to 120	7897A83	0000000

Easy-Read Tank-Mount Pressure-Regulating Valves with Flowmeter for Inert Gas

Flowmeters let you see the gas flow rate from a distance. 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. They have a gauge for monitoring inlet pressure from the tank.

For Carbon Dioxide

Female Inlet ×

Female Outlet With

One Flowmeter

1 Flowmeter—Valves with one flowmeter are for one piece of equipment on a tank. The flowmeter has a single scale.

	Inlet					Outlet					Material
	CGA No.	Location	Thread Direction	Pressure Gauge Reading Range, psi	No. of Stages	Thread Size	Location	Thread Direction	Flow Range	No. of Flowmeters	Body	Seal	Diaphragm		Each
UNF Female Outlet × NGO Female Inlet



		320	Side	Right Hand	0 to 4,000	Single	5/8"-18	Side	Right Hand	0 scfh to 70 scfh	1	Brass	PTFE	Neoprene	78595A46	0000000

Valve Union Fittings