Bronze Butterfly Valves | McMaster-Carr

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30 Products

Threaded Flow-Adjustment Valves

These valves gradually open and close to adjust and regulate flow.

Bronze Body


Straight with Lever Handle	Straight with Flow-Indicating Lever Handle

Flow-Indicating-Handle—Flow-indicating lever handles show the proportion the valve is open.

Lever Handle—Lever handles open and close faster than wheel handles.

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.

									Lever Handle		Flow-Indicating Lever Handle
	Pipe Size	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Temp. Range, ° F	End-to-End Lg.	Valve Type	For Use With	Certification		Each		Each
NPT Female × NPT Female—Straight



		1/4	4.5	175 psi @ 100° F	-20 to 275	2 1/4"	Butterfly	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	CSA Certified, CSA-US Certified, UL Listed	9798K31	000000	4682K52	000000


		3/8	10	175 psi @ 100° F	-20 to 275	2 3/8"	Butterfly	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	CSA Certified, CSA-US Certified, UL Listed	9798K32	00000	4682K53	00000
		1/2	13	175 psi @ 100° F	-20 to 275	1 15/16"	Butterfly	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	CSA Certified, CSA-US Certified, UL Listed	9798K33	00000	4682K54	00000
		3/4	25	175 psi @ 100° F	-20 to 275	2 1/16"	Butterfly	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	CSA Certified, CSA-US Certified, UL Listed	9798K34	00000	4682K55	00000
		1	43	175 psi @ 100° F	-20 to 275	2 5/16"	Butterfly	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	CSA Certified, CSA-US Certified, UL Listed	9798K35	00000	4682K56	00000
		1 1/4	85	175 psi @ 100° F	-20 to 275	2 5/8"	Butterfly	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	CSA Certified, CSA-US Certified, UL Listed	9798K36	00000	4682K57	000000
		1 1/2	112	175 psi @ 100° F	-20 to 275	2 7/8"	Butterfly	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	CSA Certified, CSA-US Certified, UL Listed	9798K37	000000	4682K58	000000
		2	180	175 psi @ 100° F	-20 to 275	3 1/4"	Butterfly	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	CSA Certified, CSA-US Certified, UL Listed	9798K38	000000	4682K59	000000

Drain Valves

Also known as stop cocks, install these valves on your tank for easy draining of air or fluid.

Wing Nut Handle—Inline (Wing Facing Inlet)

Image of Product. Front orientation. Drain Valves. Drain Valves, Wing Facing Inlet, Wing Nut Handle, Inline Handle.

Valves with a wing nut handle give you leverage to open tight, stubborn valves that have been sealed for long periods of time. The wings on these handles face inward, so they have a lower profile than handles with outlet-facing wing nuts.

Inline handles can be operated from any position. The handle surrounds the drain outlet, so liquids may splash onto your hands or the handle.

External Seal—Valves with an external seal are for higher flow applications than valves with an internal seal. They also have a longer valve stem, so they’re less likely to introduce contaminants from exposed threads.

Internal Seal—Valves with an internal seal have shorter stems than those with external seals, so they fit shorter clearances. However, they’re more likely to introduce contaminants to the tank from debris collected on the exposed threads.

Tube—Valves with a tube outlet can be attached to a tube or hose to route the flow of draining liquid.

Brass Handle—Brass handles won’t corrode.

Brass Body—Valves with a brass body won’t corrode when venting air or draining water—even in wet or humid environments.

	Inlet			Outlet
	Pipe Size	Thread Type	Gender	Connection Port	For Tube ID	Connection	Gender	Handle Material	Body Material	For Use With	Max. Pressure @ Temp.	Temp. Range, ° F	Ht.		Each
Straight—External Seal



		1/8	NPT	Male	Drain	—	—	—	Brass	Brass	Water, Oil	150 psi @ 250° F	-65 to 250	15/16"	4921K32	00000


		1/8	NPT	Male	Drain	—	—	—	Steel	Brass	Air, Water, Oil, Inert Gas	150 psi @ 250° F	-65 to 250	7/8"	4921K86	0000
		1/4	NPT	Male	Tube	3/8"	Barbed	Male	Brass	Brass	Water, Oil	150 psi @ 250° F	-65 to 250	1 9/16"	4921K44	0000
		1/4	NPT	Male	Drain	—	—	—	Steel	Brass	Water, Oil	150 psi @ 250° F	-40 to 350	1"	4921K16	0000
		3/8	NPT	Male	Drain	—	—	—	Brass	Brass	Water, Oil	150 psi @ 250° F	-65 to 250	1 1/4"	4921K34	0000
		3/8	NPT	Male	Drain	—	—	—	Steel	Brass	Air, Water, Oil, Inert Gas	150 psi @ 250° F	-65 to 250	1 1/4"	4921K89	0000
		1/2	NPT	Male	Drain	—	—	—	Brass	Brass	Water, Oil	150 psi @ 250° F	-65 to 250	1 1/2"	4921K35	00000


		Straight—Internal Seal



				1/8	NPT	Male	Drain	—	—	—	Brass	Brass	Water, Oil	150 psi @ 250° F	-65 to 250	1 5/16"	4921K41	00000


				1/4	NPT	Male	Drain	—	—	—	Brass	Brass	Water, Oil	150 psi @ 250° F	-65 to 250	15/16"	4921K42	0000
				3/8	NPT	Male	Drain	—	—	—	Brass	Brass	Water, Oil	150 psi @ 250° F	-65 to 250	1 1/4"	4921K51	0000

Wing Nut Handle—Inline (Wing Facing Outlet)

Image of Product. Bottom orientation. Drain Valves. Drain Valves, Wing Nut Handle, Wing Facing Outlet, Inline Handle.

Inline handles can be operated from any position. The handle surrounds the drain outlet, so liquids may splash onto your hands or the handle.

Tube—Valves with a tube outlet can be attached to a tube or hose to route the flow of draining liquid.

Spout—A spout outlet smoothly pours any draining liquid into buckets without splashing.

Brass Handle—Brass handles won’t corrode.

Brass Body—Valves with a brass body won’t corrode when venting air or draining water—even in wet or humid environments.

	Inlet			Outlet
	Pipe Size	Thread Type	Gender	Connection Port	For Tube ID	Connection	Gender	Handle Material	Body Material	For Use With	Max. Pressure @ Temp.	Temp. Range, ° F	Ht.		Each
Straight—External Seal



		1/8	NPT	Male	Tube	1/4"	Barbed	Male	Brass	Brass	Water, Oil	150 psi @ 250° F	-65 to 250	1 1/2"	4921K43	00000


		1/4	NPT	Male	Drain	—	—	—	Steel	Brass	Air, Water, Oil, Inert Gas	150 psi @ 250° F	-65 to 250	1"	4921K87	0000
		1/4	NPT	Male	Spout	—	—	—	Steel	Brass	Air, Water, Oil, Inert Gas	150 psi @ 250° F	-65 to 250	1 1/2"	4921K88	0000

Wing Nut Handle—Side (Wing Facing Inlet)

Image of Product. Bottom orientation. Drain Valves. Drain Valves, Wing Nut Handle, Side Handle, Wing Facing Inlet.

Side handles are out of the way of the flow, so your hand and the handle stay dry.

Spout—A spout outlet smoothly pours any draining liquid into buckets without splashing.

Brass Body—Valves with a brass body won’t corrode when venting air or draining water—even in wet or humid environments.

	Inlet
	Pipe Size	Thread Type	Gender	Outlet Connection Port	Handle Material	Body Material	For Use With	Max. Pressure @ Temp.	Temp. Range, ° F	Port-to-Port Lg.		Each
90° Elbow—External Seal



		1/4	NPT	Male	Spout	Steel	Brass	Air, Water, Oil, Inert Gas	150 psi @ 250° F	-65 to 250	11/16"	4921K85	00000