Regulators for Hydrogen | McMaster-Carr

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28 Products

About Pressure-Relief Valves

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

Male Inlet × Female Outlet With One Flowmeter

Female Inlet × Male Outlet With One Flowmeter

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.

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.

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

Adapters (sold separately) change 5/8"-18 outlets to 9/16"-18 male connections, and vice versa.

For Use With Helium and Hydrogen

Inlet					Outlet					Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Stage	Thread Size	Location	Thread Direction	Flow Range, scfh	Number of Flowmeters	Body	Seal	Diaphragm		Each
UNF Female Outlet × NGO Male Inlet
CGA 580	Side	Right Hand	0 to 4,000	Single	5/8"-18	Side	Right Hand	0 to 100 (Helium), 0 to 140 (Hydrogen)	1	Brass	PTFE	Neoprene	000000000	0000000

Optional Adapter

00000000

Each

000000

For Use With Hydrogen

Inlet					Outlet					Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Stage	Thread Size	Location	Thread Direction	Flow Range, scfh	Number of Flowmeters	Body	Seal	Diaphragm		Each
UNF Male Outlet × NGO Female Inlet
CGA 350	Side	Left Hand	0 to 3,000	Single	9/16"-18	Side	Left Hand	0 to 40	1	Brass	PTFE	Neoprene	000000000	0000000

Optional Adapter

00000000

Each

000000

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.

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.

Single-Stage Valves

Male Outlet × Female 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 Hydrogen
UNF Male Outlet × NGO Female Inlet
CGA 350	Side	Left Hand	0 to 4,000	9/16"-18	Side	Left Hand	0 to 125	T-Handle	Brass	PTFE	Rubber	000000	0000000

Two-Stage Valves

Male Outlet × Female Inlet Two-Stage Valve With Knob

Inlet				Outlet				Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Thread Size	Location	Thread Direction	Pressure Range, psi	Body	Seal	Diaphragm		Each
For Use With Hydrogen and Methane
UNF Male Outlet × NGO Female Inlet
CGA 350	Side	Left Hand	0 to 4,000	9/16"-18	Side	Left Hand	2 to 40	Brass	Neoprene	Rubber	0000000	0000000

High-Purity Tank-Mount Pressure-Regulating Valves for Fuel Gases

Single Stage

Two Stage

For Use With: Hydrogen, Methane
Temperature Range: -20° to 120° F

Designed to reduce contaminants in high-purity applications using hydrogen and methane gas, these valves have a 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’re often used in research sample systems, emission monitoring systems, and chromatography. 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. 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 come with a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank.

Inlet					Outlet
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Stage	For Tube OD	Location	Pressure Range, psi	Pressure Adjustment Method		Each
Swagelok® Female Outlet × NGO Female Inlet
Brass/Stainless Steel Body—316 Stainless Steel Diaphragm and PTFE Seal with Relief Valve
CGA 350	Side	Left Hand	0 to 4,000	Single	1/4"	Side	0 to 15	Knob	0000000	0000000
CGA 350	Side	Left Hand	0 to 4,000	Single	1/4"	Side	0 to 125	Knob	0000000	000000
CGA 350	Side	Left Hand	0 to 4,000	Two	1/4"	Side	0 to 15	Knob	0000000	000000
CGA 350	Side	Left Hand	0 to 4,000	Two	1/4"	Side	0 to 125	Knob	0000000	000000
CGA 350	Side	Left Hand	0 to 4,000	Two	1/4"	Side	0 to 500	Knob	0000000	000000

Pressure-Regulating Valves for Fuel Gases

With T-Handle

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 Adjustment Method	Pressure Gauge Range, psi	Temperature Range, ° F	End-to-End Lg.	Port-to-Port Lg.		Each
NPT Female
Brass Body—Stainless Steel Diaphragm and Neoprene Seal
Hydrogen, Propane	1/4	Side	500	1/4	Bottom, Side	T-Handle	0 to 60	0° to 120°	2.40"	1.01"	0000000	0000000
Hydrogen, Propane	1/4	Side	500	1/4	Bottom, Side	T-Handle	0 to 200	0° to 120°	2.40"	1.01"	0000000	000000

ASME-Code Fast-Acting Pressure-Relief Valves for Cryogenic Fluids

For Use With: Argon, Carbon Dioxide, Helium, Hydrogen, Methane, Nitrogen, Oxygen
Specifications Met: ASME BPVC.VIII
Temperature Range: -320° to 150° F

These valves meet ASME Code Section VIII for use with cryogenic pressure vessels. Rated for use with argon, carbon dioxide, helium, hydrogen, methane, nitrogen, and oxygen, they are cleaned and bagged for oxygen service and other high-purity applications. All spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. Attach a drain line to the threaded relief port for remote discharge.

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

Inlet			Relief Port
Pipe Size	Location	Maximum Pressure, psi	Pipe Size	Location	Overall Ht.	Valve Type	Choose a Set Pressure, psi		Each
NPT Male Inlet and NPT Female Relief Port
Brass Body and Seal
1/2	Bottom	600	3/4	Side	6 9/16"	Pop Safety	20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300	0000000	0000000
3/4	Bottom	600	1	Side	6 9/16"	Pop Safety	20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300	0000000	000000

Pressure-Relief Airlocks

Vent carbon dioxide and other gases out of your container without letting dust, oxygen, and other contaminants in. Fill these airlocks with water or a sanitizing solution and they form a liquid seal. They’re often used in fermentation, such as beer and wine making, as well as other jobs where chemical reactions or temperature changes produce gas inside your container. A cap blocks out dust even as it vents the gas.

Push these airlocks into flasks, carboys, and other containers that have a rubber stopper with a hole. The airlocks come apart in three pieces for easy and thorough cleaning—no need for specially shaped brushes to reach every crevice.

	Overall		Stem						Body
Connection Style	Diameter	Height	Diameter	Height	Maximum Pressure	Maximum Temperature, °F	Shape	Cap Material	Material	Clarity	For Use With		Each
Push On	1 1/8"	4 5/8"	1/2"	1 9/16"	Not Rated	140°	Straight	Polyethylene Plastic	Polystyrene Plastic	Clear	Air, Beverage, Drinking Water, Hydrogen, Oxygen, Steam, Water	0000000	00000

Nuts for High-Pressure Nipples for Compressed Gas

Slide a high-pressure hose nipple for compressed gas into one of these nuts to connect a pipe to the inlet of a pressure regulator. They are also known as CGA (Compressed Gas Association) nuts and inlet nuts.

Brass nuts have good corrosion resistance and are softer than 316 stainless steel nuts, so they're easier to thread together. Chrome-plated brass nuts have comparable corrosion and wear resistance to aluminum-plated brass nuts, and have a bright, shiny appearance.

Nuts with left-hand threads are identified with a notch.

Note: Nuts have a CGA, BS, or DIN number that corresponds to a specific type of gas. Choose a nut with the same number as your tank and other system components.

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

Female

Female Nut

Maximum Pressure: See table
Maximum Temperature: 120° F, except DIN 477 No. 9: 250° F

Brass
Number	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 350	0.830"-14	NGO	Left Hand	3,000 psi @ 72° F	Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas	000000000	00000
Chrome-Plated Brass
CGA 350	0.830"-14	NGO	Left Hand	3,000 psi @ 72° F	Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas	000000000	00000

Male

Male Nut

Maximum Pressure: See table
Maximum Temperature: 120° F, except DIN 477 No. 12: 250° F

Brass
Number	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 680	1.040"-14	NGO	Right Hand	4,700 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	000000000	000000
CGA 702	1.120"-14	NGO	Right Hand	6,400 psi @ 72° F	Air	000000000	00000

High-Pressure Nipples for Compressed Gas

Commonly used in high-pressure welding applications, these nipples connect your tank to the inlet of a pressure regulator. One side has a threaded pipe end and the other side has a rounded end that sits inside a threaded nut (sold separately) so you can make a threaded connection.

Brass nipples have good corrosion resistance and are softer than 316 stainless steel nipples, so they're easier to thread together. Chrome-plated brass nipples have better corrosion and wear resistance than unplated brass nipples and have a bright, shiny appearance.

Nipples with filter help keep the line clean by preventing small particles and other impurities from entering your pressure regulator.

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

Nipples, Tank × Male Regulator

Maximum Pressure: See table
Maximum Temperature: 120° F

	Regulator Connection
For Number (Max. Pressure)	Pipe Size	Thread Type	Lg.	For Use With	Features		Each
Brass—Tighten With Wrench
CGA 350 (3,000 psi @ 72° F)	1/4	NPT	2 1/2"	Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas	__	000000000	00000
CGA 680, 695 (3,000 psi @ 72° F); CGA 702, 703 (4,700 psi @ 72° F)	1/4	NPT	3"	Air, Argon, Flammable Gases, Helium, Hydrogen, Krypton, Methane, Natural Gas, Neon, Nitrogen, Xenon	__	000000000	00000
CGA 680, 695 (3,000 psi @ 72° F); CGA 702, 703 (5,500 psi @ 72° F)	1/4	NPT	3 1/64"	Air, Argon, Flammable Gases, Helium, Hydrogen, Krypton, Methane, Natural Gas, Neon, Nitrogen, Xenon	Filter	000000000	00000
Chrome-Plated Brass—Tighten With Wrench
CGA 350 (3,000 psi @ 72° F)	1/4	NPT	3"	Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas	__	000000000	00000

Nuts

Female Nut

Male Nut

Maximum Pressure: See table
Maximum Temperature: 120° F

Brass
Number	Gender	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
CGA 350	Female	0.830"-14	NGO	Left Hand	3,000 psi @ 72° F	Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas	000000000	00000
CGA 680	Male	1.040"-14	NGO	Right Hand	4,700 psi @ 72° F	Argon, Helium, Krypton, Neon, Nitrogen, Xenon	000000000	00000
CGA 702	Male	1.120"-14	NGO	Right Hand	6,400 psi @ 72° F	Air	000000000	00000
Chrome-Plated Brass
CGA 350	Female	0.830"-14	NGO	Left Hand	3,000 psi @ 72° F	Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas	000000000	00000

High-Pressure Threaded Fittings for Compressed Gas

Designed to handle high-pressure welding applications, these fittings are commonly used to connect pressure regulators to compressed gas tanks or cylinders. Fittings are also known as CGA (Compressed Gas Association) fittings. They are brass for good corrosion resistance.

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

Note: Fittings have a CGA number that corresponds to a specific type of gas. Choose a fitting with the same CGA number as your tank and other system components.

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

Female Tank × Female Regulator

Maximum Pressure: See table
Maximum Temperature: 120° F

CGA Number		Tank Connection			Regulator Connection
Tank	Regulator	Thread Size	Thread Type	Thread Direction	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
Brass
350	580	0.830"-14	NGO	Left Hand	0.960"-14	NGO	Right Hand	3,000 psi @ 72° F	Argon, Carbon Monoxide, Ethane, Ethylene, Helium, Hydrogen, Krypton, Methane, Methyl Fluoride, Natural Gas, Neon, Nitrogen, Xenon	0000000	000000

Male Tank × Male Regulator

Maximum Pressure: See table
Maximum Temperature: 120° F

CGA Number		Tank Connection			Regulator Connection
Tank	Regulator	Thread Size	Thread Type	Thread Direction	Thread Size	Thread Type	Thread Direction	Max. Pressure	For Use With		Each
Brass
580	350	0.960"-14	NGO	Right Hand	0.830"-14	NGO	Left Hand	3,000 psi @ 72° F	Argon, Carbon Monoxide, Ethane, Ethylene, Helium, Hydrogen, Krypton, Methane, Methyl Fluoride, Natural Gas, Neon, Nitrogen, Xenon	0000000	000000

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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About Pressure-Relief Valves

How to Identify and Measure Fittings

About Gas Regulators

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

Tank-Mount Pressure-Regulating Valves for Fuel Gases

High-Purity Tank-Mount Pressure-Regulating Valves for Fuel Gases

Pressure-Regulating Valves for Fuel Gases

ASME-Code Fast-Acting Pressure-Relief Valves for Cryogenic Fluids

Pressure-Relief Airlocks

Nuts for High-Pressure Nipples for Compressed Gas

High-Pressure Nipples for Compressed Gas

High-Pressure Threaded Fittings for Compressed Gas

Welding Gas Check Valves for Regulators

Welding Gas Check Valves for Torches