Balancing Valves | McMaster-Carr

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56 Products

Threaded Balancing Valves

Thread these balancing valves onto pipe—they help you measure the pressure differential across the valve as well as change the flow rate to components in your system. Sometimes called circuit setters, they’re used in HVAC systems and other systems that require even flow distribution. To see what percentage they’re open, there’s an arrow on these valves that’s connected to their measuring plate. Readout ports on both sides let you attach flow measurement tools, such as pressure gauges and probes, which help you track how much the valves reduce flow. Open these valves to a saved percentage by using their memory shutoff function.

Brass Body—Straight

Image of Product. Front orientation. Flow-Adjustment Valves. Threaded Balancing Valves.

Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

				Overall
	Pipe Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Ht.	Wd.	Lg.	Temp. Range, ° F	Seal Material	Seat Material	End-to-End Lg.	Stem Type	Certification	For Use With	Valve Type	Features		Each
NPT Female × NPT Female



		1/2	1.52	400 psi @ 250° F	2 1/4"	3 1/16"	3"	0 to 250	EPDM	TFE	3"	Nonrising	CSA Certified	Water	Ball	Measuring Plate, Memory Shutoff Function, Two 1/4 NPT Female Brass Readout Ports with EPT Check Valves	5782N11	0000000


		3/4	2.75	400 psi @ 250° F	2 7/16"	3 1/8"	3 1/16"	0 to 250	EPDM	TFE	3 1/16"	Nonrising	CSA Certified	Water	Ball	Measuring Plate, Memory Shutoff Function, Two 1/4 NPT Female Brass Readout Ports with EPT Check Valves	5782N12	000000
		1	5.75	400 psi @ 250° F	2 3/4"	3 7/16"	3 13/16"	0 to 250	EPDM	TFE	3 13/16"	Nonrising	CSA Certified	Water	Ball	Measuring Plate, Memory Shutoff Function, Two 1/4 NPT Female Brass Readout Ports with EPT Check Valves	5782N13	000000
		1 1/4	12.5	400 psi @ 250° F	3 3/16"	3 3/4"	4 7/16"	0 to 250	EPDM	TFE	4 7/16"	Nonrising	CSA Certified	Water	Ball	Flow Indicator, Measuring Plate, Memory Shutoff Function, Two 1/4 NPT Female Brass Readout Ports with EPT Check Valves	5782N14	000000
		1 1/2	19.9	400 psi @ 250° F	3 5/16"	4"	4 7/16"	0 to 250	EPDM	TFE	4 7/16"	Nonrising	CSA Certified	Water	Ball	Flow Indicator, Measuring Plate, Memory Shutoff Function, Two 1/4 NPT Female Brass Readout Ports with EPT Check Valves	5782N15	000000
		2	40	400 psi @ 250° F	3 15/16"	4 1/2"	5 3/16"	0 to 250	EPDM	TFE	5 3/16"	Nonrising	CSA Certified	Water	Ball	Flow Indicator, Measuring Plate, Memory Shutoff Function, Two 1/4 NPT Female Brass Readout Ports with EPT Check Valves	5782N16	000000
		2 1/2	65	400 psi @ 250° F	4 1/2"	4 7/8"	6"	0 to 250	EPDM	TFE	6"	Nonrising	CSA Certified	Water	Ball	Flow Indicator, Measuring Plate, Memory Shutoff Function, Two 1/4 NPT Female Brass Readout Ports with EPT Check Valves	5782N17	000000
		3	112	400 psi @ 250° F	5 1/16"	5 1/2"	6 1/2"	0 to 250	EPDM	TFE	6 1/2"	Nonrising	CSA Certified	Water	Ball	Flow Indicator, Measuring Plate, Memory Shutoff Function, Two 1/4 NPT Female Brass Readout Ports with EPT Check Valves	5782N18	00000000

Air-Release Valves for Oil and Fuel

Use this valve to eliminate air pockets in systems for oil, diesel fuel, gasoline, and kerosene. Valve has a vented relief port to exhaust discharge directly. Body is 304 stainless steel for excellent corrosion resistance.

	Inlet		Relief Port
	Pipe Size	Location	Pipe Size	Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
NPT Female Inlet and Relief Pipe







				304 Stainless Steel Body—Vertical Mount

				3/4	Bottom	1/2	Top	400	-20 to 500	7"	8126K12	0000000

Solder-Socket Balancing Valves

Attach these balancing valves using solder—they help you measure the difference in pressure across the valve and adjust the flow rate to system components. Also known as circuit setters, they’re often used in systems that need an even distribution of flow, such as HVAC systems. To check what percentage they’re open, there’s an arrow on these valves that’s connected to their measuring plate. There are readout ports on both sides for connecting flow measurement tools, such as pressure gauges and probes, which help you track how much the valves reduce flow. Use the memory shutoff function to open them to a saved setting.

Brass Body—Straight

Image of Product. Front orientation. Flow-Adjustment Valves. Solder-Socket Balancing Valves.

				Overall
	For Tube OD	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Ht.	Wd.	Lg.	Temp. Range, ° F	Seal Material	Seat Material	End-to-End Lg.	Stem Type	Certification	For Use With	Valve Type	Features		Each
Solder Socket × Solder Socket



		1/2"	1.75	200 psi @ 250° F, 250 psi @ 225° F, 300 psi @ 200° F	1 7/8"	2 7/8"	2 15/16"	0 to 250	EPDM	TFE	2 15/16"	Nonrising	CSA Certified	Water	Ball	Measuring Plate, Memory Shutoff Function, Two 1/4 NPT Female Brass Readout Ports with EPT Check Valves	5781N13	0000000


		3/4"	3.4	200 psi @ 250° F, 250 psi @ 225° F, 300 psi @ 200° F	2 1/16"	3 1/8"	3 9/16"	0 to 250	EPDM	TFE	3 9/16"	Nonrising	CSA Certified	Water	Ball	Measuring Plate, Memory Shutoff Function, Two 1/4 NPT Female Brass Readout Ports with EPT Check Valves	5781N14	000000
		1"	5.75	200 psi @ 250° F, 250 psi @ 225° F, 300 psi @ 200° F	2 3/8"	3 3/8"	4 5/16"	0 to 250	EPDM	TFE	4 5/16"	Nonrising	CSA Certified	Water	Ball	Measuring Plate, Memory Shutoff Function, Two 1/4 NPT Female Brass Readout Ports with EPT Check Valves	5781N15	000000

Corrosion-Resistant Remote-Discharge Air-Release Valves for Water

For excellent corrosion resistance in wet conditions and harsh environments, these valves have no metal parts. They eliminate air pockets to maintain consistent flow and prevent water surges that can damage equipment. All have a threaded relief port that can be attached to a drain line for remote discharge.

	Inlet		Relief Port
	Pipe Size	Location	Pipe Size	Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
NPT Female Inlet and Relief Pipe







				PVC Body—Vertical Mount

				1/2	Bottom	1/2	Top	150	32 to 140	3"	48515K16	000000


				3/4	Bottom	3/4	Top	150	32 to 140	3 1/2"	48515K41	00000
				1	Bottom	1	Top	150	32 to 140	3 7/8"	48515K17	00000
				1 1/4	Bottom	1 1/4	Top	150	32 to 140	4 1/2"	48515K42	00000
				2	Bottom	2	Top	150	32 to 140	5 3/4"	48515K43	000000

Air-Release Valves for Water and Coolant

These valves are often used to remove air pockets in cooling and heating systems to maintain consistent flow and prevent water surges that can damage equipment. All have a vented relief port to exhaust discharge directly.

NPT Female Inlet and Relief Vent

Image of Product. Front orientation. Air Vent Valves. Air-Release Valves for Water and Coolant, Female Inlet.

	Inlet
	Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
Brass Body—Vertical Mount



		1/8	Bottom	Top	75	33 to 240	4 3/8"	4928K1	000000


		1/4	Bottom	Top	150	33 to 240	4 3/8"	4928K3	00000

NPT Female Inlet, NPT Female Outlet and Relief Vent

Image of Product. Front orientation. Air Vent Valves. Air-Release Valves for Water and Coolant, Female Outlet, Female Inlet.

	Inlet		Outlet
	Pipe Size	Location	Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
Brass Body—Vertical Mount



		1/8	Bottom	1/8	Side	Top	75	33 to 240	4 3/8"	4928K2	000000

NPT Female/Male Inlet and Relief Vent

Valves with female/male inlets have an inlet with both male and female threads, so they can be connected to both male and female adapters and equipment ports.

	Inlet
	Female Pipe Size	Male Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
Brass Body—Vertical Mount



		1/2	3/4	Bottom	Top	150	33 to 240	4 3/4"	4928K4	000000

NPT Male Inlet and Relief Vent

Image of Product. Top orientation. Air Vent Valves. Air-Release Valves for Water and Coolant, Male Inlet.

	Inlet
	Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
Brass Body—Vertical Mount



		1/8	Bottom	Top	50	33 to 240	2 5/8"	4928K11	000000


		1/8	Bottom	Top	50	33 to 240	3 3/4"	4928K12	00000
		1/8	Bottom	Top	75	33 to 240	4 3/8"	4928K8	00000
		1/4	Bottom	Top	50	33 to 240	4"	4928K13	00000
		1/4	Bottom	Top	150	33 to 240	4 3/4"	4928K9	00000
		1/2	Bottom	Top	150	33 to 240	3 3/8"	4928K16	00000
		3/4	Bottom	Top	150	33 to 240	3 3/8"	4928K17	00000
		1	Bottom	Top	150	33 to 240	3 1/2"	4928K18	00000

Air-Release Valves for Drinking Water

Eliminate air pockets in your drinking water system with these valves. They meet NSF/ANSI 61, which designates them as safe to use with drinking water. They have a vented relief port to exhaust discharge directly.

	Inlet		Relief Port
	Pipe Size	Location	Pipe Size	Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
NPT Female Inlet and Relief Pipe







				Cast Iron Body—Vertical Mount

				1/2	Bottom	1/2	Top	300	33 to 225	7"	4790T31	0000000


				1	Bottom	1	Top	300	33 to 225	9 1/2"	4790T32	000000
				2	Bottom	2	Top	300	33 to 225	12"	4790T33	000000
				3	Bottom	3	Top	300	33 to 225	12"	4790T34	00000000

Motor-Actuated Solder-Socket On-Off Valves

Slide copper pipe into the solder-socket fittings on these valves and weld for a strong, permanent connection. They’re often used for remote on/off control in heating and cooling systems. All operate on electricity to automatically start and stop flow. Valves do not require a minimum pressure drop between the inlet and the outlet for operation. They are normally closed unless actuated. All are standard port, so they slightly restrict flow.

The actuator is directly mounted to the valve body to minimize movement and reduce wear. The manual override allows you to operate the valve during power outages.

Brass Body with Wire Lead Connection

Image of Product. Front orientation. Contains Annotated. Motor-Actuated On-Off Valves. Motor-Actuated Solder-Socket On-Off Valves.

													Overall
	Fitting Connection	Port Type	For Tube OD	For Copper Tube Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Manual Override	Valve Type	Actuation Time, sec.	Temp. Range, ° F	Valve Lg.	Lg.	Ht.	Certification		Each
24V AC



		Solder Socket	Standard	5/8"	1/2	3.5	300 psi @ 250° F	15 psi @ 250° F	Yes	Ball Zero Pressure Drop	9	35 to 250	3 1/2"	3 11/16"	4 1/4"	C-UL Listed, UL Listed	19005K21	0000000


		Solder Socket	Standard	7/8"	3/4	3.5	300 psi @ 250° F	15 psi @ 250° F	Yes	Ball Zero Pressure Drop	9	35 to 250	3 1/2"	3 11/16"	4 1/4"	C-UL Listed, UL Listed	19005K22	000000
		Solder Socket	Standard	1 1/8"	1	3.5	300 psi @ 250° F	15 psi @ 250° F	Yes	Ball Zero Pressure Drop	9	35 to 250	3 1/2"	3 11/16"	4 1/4"	C-UL Listed, UL Listed	19005K23	000000


		120V AC



				Solder Socket	Standard	5/8"	1/2	2.5	300 psi @ 250° F	15 psi @ 250° F	Yes	Ball Zero Pressure Drop	9	35 to 250	3 1/2"	3 11/16"	4 1/4"	C-UL Listed, UL Listed	19005K11	000000


				Solder Socket	Standard	7/8"	3/4	2.5	300 psi @ 250° F	15 psi @ 250° F	Yes	Ball Zero Pressure Drop	9	35 to 250	3 1/2"	3 11/16"	4 1/4"	C-UL Listed, UL Listed	19005K12	000000
				Solder Socket	Standard	1 1/8"	1	2.5	300 psi @ 250° F	15 psi @ 250° F	Yes	Ball Zero Pressure Drop	9	35 to 250	3 1/2"	3 11/16"	4 1/4"	C-UL Listed, UL Listed	19005K13	000000

Inline Air-Release Valves for Water

Eliminate air pockets without stopping flow—these valves have an internal wire brush that traps air bubbles and discharges them through the top relief port while allowing inline flow from the inlet to the outlet. They are often used to increase efficiency in heating and cooling systems. The vented relief port exhausts discharge directly. Valves have a durable bronze body for a long service life.

	Inlet		Outlet
	Pipe Size	Location	Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.	End-to-End Lg.		Each
NPT Female Inlet, NPT Female Outlet and Relief Vent







				Bronze Body—Vertical Mount

				3/4	Side	3/4	Side	Top	125	40 to 240	6 15/16"	2 11/16"	4742T11	0000000


				1	Side	1	Side	Top	125	40 to 240	6 1/2"	3 1/8"	4742T12	000000

Air-Release Valves for Steam

Our only air-release valves for steam, these seal shut when steam enters the valve to prevent system contents from escaping through the relief port. They are commonly used to eliminate air pockets in steam mains and risers. They exhaust discharge directly through the vented relief port.

		Inlet
	Max. Steam Pressure, psi	Pipe Size	Location	Relief Port Location	Max. Temp., ° F	Overall Ht.		Each
NPT Male Relief Vent







				Brass Body

				15	3/4	Bottom	Top	250	3 1/2"	4926K52	000000

Remote-Discharge Air-Release Valves for Water

Unlike valves that release discharge directly, these have a threaded relief port to direct discharge away from your work environment. Often used to increase pump efficiency, they eliminate air pockets in your system to maintain consistent flow and prevent water surges that can damage equipment.

	Inlet		Relief Port
	Pipe Size	Location	Pipe Size	Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
NPT Female Inlet and Relief Pipe







				Cast Iron Body—Vertical Mount

				1/2	Bottom	3/8	Top	150	32 to 150	5 3/4"	48045K94	0000000


				3/4	Bottom	3/8	Top	150	32 to 150	5 3/4"	48045K95	000000
				1	Bottom	3/8	Top	150	32 to 150	5 3/4"	48045K96	000000




						Ductile Iron Body—Vertical Mount

						3/8	Bottom	3/8	Top	150	32 to 150	5 3/4"	48045K93	000000


						1/2	Bottom	1/2	Top	300	32 to 150	5 1/2"	48045K71	000000
						3/4	Bottom	1/2	Top	300	32 to 150	5 1/2"	48045K72	000000
						1	Bottom	1/2	Top	150	32 to 150	9"	48045K81	000000
						1	Bottom	1/2	Top	300	32 to 150	5 1/2"	48045K73	000000
						2	Bottom	1/2	Top	150	32 to 150	9"	48045K87	000000
						2	Bottom	1/2	Top	150	32 to 150	10 1/2"	48045K83	000000

Corrosion-Resistant Air-Release Valves for Water and Coolant

These valves are made of corrosion-resistant materials for use in wet conditions and harsh environments. They eliminate air pockets to maintain consistent flow and prevent water surges that can damage equipment. All have a vented relief port to exhaust discharge directly.

Buna-N Seal—Valve with a Buna-N seal is for use in heating and cooling systems.

EPDM Seal—Valve with an EPDM seal is for use in cooling systems only.

	Inlet
	Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each
NPT Male Inlet and Relief Vent







				Nylon Body—Vertical Mount—Buna-N Seal

				1/8	Bottom	Top	90	40 to 180	5 1/4"	47225K63	000000




						Nylon Body—Vertical Mount—EPDM Seal

						1/8	Bottom	Top	90	40 to 212	5 1/4"	47225K83	00000

Key-Operated Air-Release Valves for Water

Turn the key to manually release air from radiators, heaters, and other hot water equipment. These valves have a vented relief port that exhausts discharge directly. Body is nickel-plated brass for good corrosion resistance.

	Valves								Replacement Keys
	Inlet
	Pipe Size	Location	Relief Port Location	Max. Pressure, psi	Temp. Range, ° F	Overall Ht.		Each		Each
NPT Male Inlet and Relief Vent







				Nickel-Plated Brass Body—Any-Angle Mount

				1/8	Bottom	Side	150	33 to 200	13/16"	1813K31	000000	1813K21	00000