Nitrogen Purge | McMaster-Carr

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For Use With

Outlet Pressure

Inlet CGA Number

Maximum Outlet Pressure Gauge Measurement

Maximum Inlet Pressure

3,000 psi

7,500 psi

Outlet Connection Port

Pipe

Tube

Maximum Inlet Pressure Gauge Reading

Number of Stages

Outlet Thread Type

Outlet Connection

Thread Type

Material

Body Material

Diaphragm Material

Neoprene/Nylon Plastic

Rubber

Stainless Steel

Number of Gauge Ports

Outlet Gender

Inlet Gender

Outlet Thread Size

Maximum Pressure

1,000 psi to 3,999 psi

4,000 psi to 4,999 psi

5,000 psi or greater

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

Yes

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Exempt

RoHS

Not Compliant

Outlet Pressure Adjustment Method

Fitting Connection

28 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 × Male Inlet Single-Stage Valves with T-Handle	Flared Outlet × Male Inlet Single-Stage Valves	UNF Male Outlet x Male Inlet Single-Stage Valves with T-Handle	UNF Male Outlet × Male 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.

37° Flared Outlet Connection and 45° Flared Outlet Connection—Valves with flared tube outlet fittings form a tight seal on metal tubing.

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 Argon, Helium, and Nitrogen







				37° Flared UNF Male Outlet × NGO Male Inlet

				580	Side	Right Hand	0 to 4,000	Side	Right Hand	10 to 200	—	Brass	Polyurethane Rubber	Neoprene/Nylon	-20 to 120	66325A42	0000000




						45° Flared UN/UNF (SAE 45°) Male Outlet × NGO Male Inlet

						580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Neoprene	-20 to 120	3687N113	000000


						580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 500	T-Handle	Brass	PTFE	Neoprene	-20 to 120	66325A23	000000




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

								580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	3687N117	000000




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

										580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Neoprene	-20 to 120	3687N115	000000


										580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Rubber	-20 to 120	7897A38	000000
										580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 145	Knob	Brass/Steel	PTFE	Rubber	-20 to 120	7897A65	000000
										580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 200	T-Handle	Brass	PTFE	Rubber	-20 to 120	7897A12	000000

Two Stage


NPT Female Outlet × Male Inlet Two-Stage Valves with T-Handle	UNF Female Outlet x Male 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 Argon, Helium, and Nitrogen







				1/4 NPT Female Outlet × NGO Male Inlet

				580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Neoprene	-20 to 120	3687N122	0000000


				580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	3687N126	000000




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

						580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Neoprene	-20 to 120	3687N121	000000


						580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	7897A22	000000
						580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass/Steel	PTFE	Rubber	-20 to 120	7897A16	000000
						580	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Stainless Steel	-20 to 120	7897A23	000000

Tank-Mount Pressure-Regulating Valves for Moisture Removal

Designed for nitrogen gas purging in air conditioning, refrigeration, and plumbing systems, these valves automatically 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 have 45° flared tube outlet fittings for a tight seal on metal tubing. They come with 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.

	Inlet					Outlet
	CGA No.	Location	Thread Direction	Pressure Gauge Reading Range, psi	No. of Stages	For Tube OD	Location	Thread Direction	Purging Flow Range, ft³/hr	Brazing Flow Range, ft³/hr	Testing Pressure Range, psi	For Use With	Temp. Range, ° F		Each
NGO Male Inlet × 45° Flared UN/UNF (SAE 45°) Male Outlet with 7/16"-20 End







				Brass Body—PTFE Seal

				580	Side	Right Hand	0 to 3,000	Single	1/4"	Side	Right Hand	25 to 35	3 to 6	0 to 500	Nitrogen	32 to 120	66325A52	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 Nitrogen

Male Inlet × Female

Outlet With One

Flowmeter

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.

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 Male Inlet



		580	Side	Right Hand	0 to 4,000	Single	5/8"-18	Side	Right Hand	0 scfh to 100 scfh	1	Brass	PTFE	Neoprene	78595A35	0000000

Valve Union Fittings

		Each
Adapter	78595A49	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 Male Inlet







				Brass Body—Stainless Steel Diaphragm and PTFE Seal

				Nitrogen, Argon	580	Side	Right Hand	Single	9/16"-18	Bottom	Right Hand	0 to 350	T-Handle	-20 to 120	7897A87	0000000

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 Argon, Helium, and Nitrogen


Female Outlet × Female Inlet Elbow With T-Handle	Female Outlet × Male Inlet Elbow With T-Handle

	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	Temp. Range, ° F		Each
NGO Female Inlet × Swagelok® Female Outlet



		677	Side	Left Hand	0 to 7,500	Single	1/4"	Bottom	300 to 4,500	T-Handle	90° Elbow	Brass	PCTFE	-20 to 120	6677A14	000000000


		NGO Male Inlet × Swagelok® Female Outlet



				580	Side	Right Hand	0 to 4,000	Single	1/4"	Bottom	200 to 3,000	T-Handle	90° Elbow	Brass	PCTFE	-20 to 120	6677A13	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 Argon, Helium, and Nitrogen


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

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

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 Male Inlet × Swagelok® Female Outlet







				Brass Body—316 Stainless Steel Diaphragm and PTFE Seal

				580	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 15	Knob	-20 to 120	7951A14	0000000


				580	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 125	Knob	-20 to 120	7951A16	000000
				580	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 500	Knob	-20 to 120	7951A74	000000
				580	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 15	Knob	-20 to 120	7951A24	000000
				580	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 50	Knob	-20 to 120	7951A61	000000
				580	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 125	Knob	-20 to 120	7951A26	000000
				580	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 250	Knob	-20 to 120	7951A75	000000




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

						580	Side	Right Hand	0 to 4,000	Two	1/4"	Side	0 to 50	Knob	-20 to 120	7951A62	000000