Brass Vacuum Regulators | McMaster-Carr

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32 Products

Extended-Life Vacuum-Regulating Valves for Air and Inert Gas

For a longer service life than brass vacuum-regulating valves, these are made of bronze for strength and durability. They throttle a high vacuum source to maintain a lower vacuum level in your system. Turning the adjustment screw will adjust the vacuum setting.

	Inlet		Outlet
	Pipe Size	Location	Pipe Size	Location	Vacuum Range, in. Hg	Vacuum Adjustment Method	End-to-End Lg.	For Use With	Temp. Range, ° F		Each
NPT Female







				Bronze Body—Neoprene Diaphragm and Chrome-Plated Bronze Seal

				1/2	Side	1/2	Side	2 to 30	Screw	2 7/8"	Air, Inert Gas	-20 to 180	4710K11	0000000


				3/4	Side	3/4	Side	2 to 30	Screw	2 7/8"	Air, Inert Gas	-20 to 180	4710K13	000000
				1	Side	1	Side	2 to 30	Screw	4 1/2"	Air, Inert Gas	-20 to 180	4710K15	00000000
				1 1/4	Side	1 1/4	Side	2 to 30	Screw	4 1/2"	Air, Inert Gas	-20 to 180	4710K17	00000000
				1 1/2	Side	1 1/2	Side	8 to 30	Screw	5 3/4"	Air, Inert Gas	-20 to 180	4710K18	00000000
				2	Side	2	Side	8 to 30	Screw	5 3/4"	Air, Inert Gas	-20 to 180	4710K19	00000000

Adjustable Vacuum-Relief Valves for Air and Inert Gas

These valves begin opening at the set vacuum level and fully open at about 10% over the set point. They begin closing as the vacuum level drops and fully close when the system is restored below the set point. Adjust the set vacuum level within the range. Valves have a vented relief port to exhaust discharge directly.

	Inlet			Vacuum Set Point
	Pipe Size	Location	Relief Port Location	Range, in. Hg	Adjustment Method	Overall Ht.	For Use With	Temp. Range, ° F		Each
NPT Male Inlet and Vacuum Relief Vent







				Brass Body—440C Stainless Steel Seal

				1/4	Bottom	Top	0 to 27	External Adjustment Screw	1 3/4"	Air, Inert Gas	-15 to 250	48935K25	00000




						Brass Body—Buna-N Seal

						3/8	Bottom	Top	0 to 27	External Adjustment Screw	2 1/16"	Air, Inert Gas	-15 to 250	48935K35	00000


						3/4	Bottom	Top	0 to 27	External Adjustment Screw	2 5/8"	Air, Inert Gas	-15 to 250	48935K45	00000

Vacuum-Regulating Valves for Air and Inert Gas

Throttle a high vacuum source to maintain a lower vacuum level in your system. Adjust the outlet vacuum level within the range. All valves have a gauge port.

	Inlet		Outlet
	Pipe Size	Location	Pipe Size	Location	Vacuum Range, in. Hg	Vacuum Adjustment Method	Vacuum Gauge Included	End-to-End Lg.	For Use With	Temp. Range, ° F		Each
NPT Female







				Brass Body—EPM Rubber Diaphragm and Buna-N Seal

				1/4	Bottom	1/4	Side	0 to 15	Screw	No	1 3/4"	Air, Carbon Dioxide, Inert Gas, Nitrogen	-20 to 180	5021K14	0000000


				1/4	Bottom	1/4	Side	10 to 30	Screw	No	1 3/4"	Air, Carbon Dioxide, Inert Gas, Nitrogen	-20 to 180	5021K24	000000

High-Accuracy Panel-Mount Vacuum-Regulating Valves for Air and Inert Gas

For precise control over your vacuum level, these valves have ±0.1% accuracy. They throttle a high vacuum source to maintain a lower vacuum level in your system. Adjust the outlet vacuum level within the range. Valves have threads below the adjustment knob and come with a panel-mount nut. All have a gauge port. They are constant-bleed style, so they continually release small amounts of process gas to improve accuracy and repeatability.

	Inlet		Outlet
	Pipe Size	Location	Pipe Size	Location	Vacuum Range, in. Hg	Vacuum Adjustment Method	Vacuum Gauge Included	End-to-End Lg.	Bleed Type	Panel Cutout Dia.	For Use With	Temp. Range, ° F		Each
NPT Female







				Brass Body—Buna-N Diaphragm and Buna-N Seal

				1/8	Side	1/8	Side	0 to 25	Knob	No	2 1/8"	Constant Bleed	1 3/8"	Air, Argon, Nitrogen	-40 to 165	4640T71	0000000


				1/4	Side	1/4	Side	0 to 25	Knob	No	2 1/8"	Constant Bleed	1 3/8"	Air, Argon, Nitrogen	-40 to 165	4640T72	000000

Vacuum Breakers

Also known as vacuum-breaking valves, these valves have vents that open when pressure drops to relieve vacuum conditions and prevent backward suction from drawing liquid into upstream piping.

90° Elbow

Elbows are designed for intermittent flow. They discharge liquid directly and should not be installed in areas where spillage could cause damage.

Chrome-Plated Bronze Body—Chrome-plated bronze valves are more corrosion resistant than brass valves.

								Brass Body		Chrome-Plated Bronze Body
	Inlet Pipe Size	Outlet Pipe SIze	Max. Pressure @ Temp.	Temp. Range, ° F	Port-to-Port Lg.	Seal Material	For Use With		Each		Each
NPT Female Inlet × NPT Female Outlet



		1/4	1/4	125 psi @ 70° F	35 to 180	1"	Silicone Rubber	Water	———	0	9903K31	000000


		3/8	3/8	125 psi @ 70° F	35 to 180	1"	Silicone Rubber	Water	———	0	9903K33	00000
		1/2	1/2	125 psi @ 70° F	35 to 180	1 1/4"	Silicone Rubber	Water	———	0	9903K35	00000
		1/2	1/2	125 psi @ 70° F	35 to 180	1 5/16"	Silicone Rubber	Water	47685K12	000000	———	0
		3/4	3/4	125 psi @ 70° F	35 to 180	1 1/2"	Silicone Rubber	Water	47685K34	00000	9903K37	00000
		1	1	125 psi @ 70° F	35 to 180	1 5/8"	Silicone Rubber	Water	47685K36	00000	———	0
		1 1/4	1 1/4	125 psi @ 70° F	35 to 180	2"	Silicone Rubber	Water	47685K44	000000	———	0
		1 1/2	1 1/2	125 psi @ 70° F	35 to 180	2 1/4"	Silicone Rubber	Water	47685K46	000000	———	0
		2	2	125 psi @ 70° F	35 to 180	2 3/4"	Silicone Rubber	Water	47685K48	000000	———	0

Straight

Straights are often used with steam coils, heat exchangers, and space heaters.

								Brass Body
	Inlet Pipe Size	Outlet Pipe SIze	Max. Pressure @ Temp.	Temp. Range, ° F	End-to-End Lg.	Seal Material	For Use With		Each
NPT Male Inlet × NPT Female Outlet



		1/2	3/8	300 psi @ 70° F	-20 to 365	1 3/4"	EPM Rubber	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	4817K14	0000000


		3/4	1/2	300 psi @ 70° F	-20 to 365	2 1/8"	EPM Rubber	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	4817K15	000000
		1	3/4	300 psi @ 70° F	-20 to 365	2 3/8"	EPM Rubber	Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon	4817K16	000000

Vacuum Breakers with Garden-Hose Fittings

Set Screw

Tamper-Resistant

Set Screw

Prevent dirty, contaminated water from backing up into your garden hose line—install these vacuum breakers between a faucet and a garden hose. Also known as vacuum-breaking valves, these valves have a built-in check valve that blocks backflow, so you can leave your hose in a utility sink full of dirty water without the water going back into the line.

When the check valve is closed, it has vents that open to release the water. This reduces pressure in the line and confirms the valve is working. Because these valves vent water, use them in environments where spilled water won’t cause a problem. This design adheres to ASSE Standard 1011 for valves with a vent.

Mount valves to faucet outlets with a set screw, and easily thread or unthread a hose while the valves stay in place.

Valves comply with Uniform Plumbing Code (UPC) and are CSA certified, so they're safe to use in sanitary plumbing systems because they prevent contamination from flowing backward into your line.

These valves are designed to be used intermittently. They've been tested under ASME A112.1.3, which assumes the valves will not be used for more than 12 hours at a time.

Tamper-Resistant Set Screw—Valves with tamper-resistant set screws have a head that breaks off after tightening to prevent valve removal after installation.

NSF/ANSI 372—Valves that meet NSF/ANSI Standard 372 are certified lead free.

Chrome-Plated Brass Body—Chrome-plated brass valves are more corrosion resistant than plain brass valves.

											Brass Body			Chrome-Plated Brass Body
	Inlet Hose Size	Outlet Hose Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	End-to-End Lg.	Food Industry Std.	Specs. Met	Certification	Seal Material	For Use With	Temp. Range, ° F		Each	Temp. Range, ° F		Each
GHT Female Inlet × GHT Male Outlet







				Set Screw

				3/4	3/4	Not Rated	125 psi @ 70° F	1 1/2"	—	ASME A112.1.3, ASSE 1001, ASSE 1011, CAN/CSA-B64.2, UPC Compliant	CSA Certified IAPMO Listed	Rubber	Water	30 to 180	46605K55	000000	30 to 180	46605K58	000000


				3/4	3/4	Not Rated	125 psi @ 70° F	1 1/2"	NSF/ANSI 372	ASME A112.1.3, ASSE 1001, ASSE 1011, CAN/CSA-B64.2, UPC Compliant	CSA Certified IAPMO Listed	Rubber	Water	—	———	0	30 to 180	46605K13	00000




						Tamper-Resistant Set Screw

						3/4	3/4	Not Rated	125 psi @ 70° F	1 1/2"	—	ASME A112.1.3, ASSE 1001, ASSE 1011, CAN/CSA-B64.2, UPC Compliant	CSA Certified IAPMO Listed	Rubber	Water	30 to 180	46605K75	00000	30 to 180	46605K85	00000


						3/4	3/4	Not Rated	125 psi @ 70° F	1 1/2"	NSF/ANSI 372	ASME A112.1.3, ASSE 1001, ASSE 1011, CAN/CSA-B64.2, UPC Compliant	CSA Certified IAPMO Listed	Rubber	Water	33 to 180	46605K121	00000	—	———	0