Iron Vents | McMaster-Carr

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1,000 psi to 1,999 psi

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100 Products

Weather Resistant Breather Vents

Threaded NPT

Female, Style B

Shield outdoor pipe and tank openings from the environment. Also known as vent caps, these breather vents have screens to allow air flow while blocking debris. Use them to prevent excess vacuum and pressure in your equipment.

Threaded NPT Female

Style B

									Screen
	Style	Pipe Size	Max. Flow Rate @ Pressure	Max. Pressure	Max. Temp.	Ht.	Dia.	For Use With	Material	Construction	Mesh Size	Removes Particle Size Down To, μm		Each
Zinc-Plated Iron Body and Fitting



		B	3/4	Not Rated	Not Rated	Not Rated	1 3/16"	1 13/16"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	00000000	000000


		B	1	Not Rated	Not Rated	Not Rated	1 5/16"	2 1/4"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	00000000	00000
		B	1 1/4	Not Rated	Not Rated	Not Rated	1 3/8"	2 3/4"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	00000000	00000
		B	1 1/2	Not Rated	Not Rated	Not Rated	1 1/2"	3 1/8"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	00000000	00000
		B	2	Not Rated	Not Rated	Not Rated	1 11/16"	3 7/8"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	00000000	00000
		B	3	Not Rated	Not Rated	Not Rated	2 1/2"	5 1/2"	Air	304 Stainless Steel	Wire Mesh	30 × 30	880	00000000	00000
		B	4	Not Rated	Not Rated	Not Rated	2 1/2"	6 1/2"	Air	304 Stainless Steel	Wire Mesh	20 × 20	864	00000000	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

				3/8	Bottom	3/8	Top	150	32 to 150	5 3/4"	00000000	0000000


				1/2	Bottom	3/8	Top	150	32 to 150	5 3/4"	00000000	000000
				3/4	Bottom	3/8	Top	150	32 to 150	5 3/4"	00000000	000000
				1	Bottom	3/8	Top	150	32 to 150	5 3/4"	00000000	000000




						Ductile Iron Body—Vertical Mount

						1/2	Bottom	1/2	Top	300	32 to 150	5 1/2"	00000000	000000


						3/4	Bottom	1/2	Top	300	32 to 150	5 1/2"	00000000	000000
						1	Bottom	1/2	Top	150	32 to 150	9"	00000000	000000
						1	Bottom	1/2	Top	300	32 to 150	5 1/2"	00000000	000000
						2	Bottom	1/2	Top	150	32 to 150	9"	00000000	000000
						2	Bottom	1/2	Top	150	32 to 150	10 1/2"	00000000	000000

Hydraulic Pressure-Relief Valves

Iron

To set the pressure, unscrew the cap and turn the adjustment screw. Valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and close when the system pressure is restored below the set pressure.

Iron Body—Iron valves absorb vibration to reduce noise and wear in the pipeline.

	Inlet Connection		Relief Connection		Overall
	Pipe Size	Dash Size	Pipe Size	Dash Size	Lg.	Wd.	Ht.	Temp. Range, ° F	Choose a Set Pressure, psi		Each
NPT Female Inlet and NPT Female Relief Port







				Iron Body

				3/8	06	3/8	06	2 1/16"	1 3/8"	5 3/8"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	0000000	0000000


				1/2	08	1/2	08	2 3/16"	1 7/16"	6 3/16"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	0000000	000000
				3/4	12	3/4	12	2 11/16"	1 11/16"	6 15/16"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	0000000	000000
				1	16	1	16	3 5/16"	2 1/16"	8 1/4"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	0000000	000000
				1 1/4	20	1 1/4	20	3 13/16"	2 1/2"	9 9/16"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	0000000	000000
				1 1/2	24	1 1/2	24	4 1/8"	2 7/8"	11 1/16"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 300 to 500	0000000	000000
				2	32	2	32	4 5/8"	3 1/4"	13"	-20 to 400	3 to 10 , 7 to 35 , 30 to 100 , 60 to 175 , 150 to 350 , 250 to 600	0000000	000000

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"	0000000	0000000


				1	Bottom	1	Top	300	33 to 225	9 1/2"	0000000	000000
				2	Bottom	2	Top	300	33 to 225	12"	0000000	000000
				3	Bottom	3	Top	300	33 to 225	12"	0000000	00000000

High-Flow Iron Steam Traps


	Replacement Pipe Gaskets

Also known as inverted-bucket steam traps, these provide near-continuous discharge to accommodate high condensate levels. They are normally open to release condensate from steam lines and close immediately when steam enters to prevent energy loss.

	Steam Traps												Replacement Pipe Gaskets
	Pipe Size	Thread Type	Gender	Pipeline Orientation	Fitting Connection	Max. Pressure, psi	Max. Temp., ° F	Condensate Cap., lb/hr	Lg.	Ht.		Each	Pkg. Qty.		Pkg.
Iron



		1/2	NPT	Female	Horizontal	Threaded	15	450	1,040	5"	6 3/8"	0000000	0000000	3	0000000	0000000


		1/2	NPT	Female	Horizontal	Threaded	30	450	1,000	5"	6 3/8"	0000000	000000	3	0000000	000000
		1/2	NPT	Female	Horizontal	Threaded	75	450	965	5"	6 3/8"	0000000	000000	3	0000000	000000
		1/2	NPT	Female	Horizontal	Threaded	125	450	920	5"	6 3/8"	0000000	000000	3	0000000	000000
		1/2	NPT	Female	Horizontal	Threaded	250	450	720	5"	6 3/8"	0000000	000000	3	0000000	000000
		3/4	NPT	Female	Horizontal	Threaded	15	450	1,040	5"	6 3/8"	0000000	000000	3	0000000	000000
		3/4	NPT	Female	Horizontal	Threaded	15	450	3,220	6 5/8"	7 5/8"	0000000	000000	3	0000000	000000
		3/4	NPT	Female	Horizontal	Threaded	30	450	1,000	5"	6 3/8"	0000000	000000	3	0000000	000000
		3/4	NPT	Female	Horizontal	Threaded	30	450	3,220	6 5/8"	7 5/8"	0000000	000000	3	0000000	000000
		3/4	NPT	Female	Horizontal	Threaded	75	450	965	5"	6 3/8"	0000000	000000	3	0000000	000000
		3/4	NPT	Female	Horizontal	Threaded	75	450	2,550	6 5/8"	7 5/8"	0000000	000000	3	0000000	000000


		3/4	NPT	Female	Horizontal	Threaded	125	450	920	5"	6 3/8"	0000000	000000	3	0000000	000000
		3/4	NPT	Female	Horizontal	Threaded	125	450	2,240	6 5/8"	7 5/8"	0000000	000000	3	0000000	000000
		3/4	NPT	Female	Horizontal	Threaded	250	450	720	5"	6 3/8"	0000000	000000	3	0000000	000000
		3/4	NPT	Female	Horizontal	Threaded	250	450	2,300	6 5/8"	7 5/8"	0000000	000000	3	0000000	000000
		1	NPT	Female	Horizontal	Threaded	15	450	3,900	8"	9 1/4"	0000000	000000	3	0000000	000000
		1	NPT	Female	Horizontal	Threaded	30	450	4,120	8"	9 1/4"	0000000	000000	3	0000000	000000
		1	NPT	Female	Horizontal	Threaded	75	450	3,960	8"	9 1/4"	0000000	000000	3	0000000	000000
		1	NPT	Female	Horizontal	Threaded	125	450	4,100	8"	9 1/4"	0000000	000000	3	0000000	000000
		1	NPT	Female	Horizontal	Threaded	250	450	3,630	8"	9 1/4"	0000000	000000	3	0000000	000000
		1 1/4	NPT	Female	Horizontal	Threaded	125	450	8,540	9 3/8"	13"	0000000	00000000	3	0000000	000000


		1 1/4	NPT	Female	Horizontal	Threaded	250	450	6,040	9 3/8"	13"	0000000	00000000	3	0000000	000000
		2	NPT	Female	Horizontal	Threaded	30	450	18,500	11 1/4"	17"	0000000	00000000	3	0000000	000000
		2	NPT	Female	Horizontal	Threaded	75	450	19,200	11 1/4"	17"	0000000	00000000	3	0000000	000000
		2	NPT	Female	Horizontal	Threaded	125	450	20,000	11 1/4"	17"	0000000	00000000	3	0000000	000000
		2	NPT	Female	Horizontal	Threaded	250	450	19,400	11 1/4"	17"	0000000	00000000	3	0000000	000000

Energy-Saving Iron Steam Traps


Style A	Style B	Style C

Also known as thermostatic steam traps, these vent cool air and condensate to increase energy efficiency in your steam lines. The vent on these steam traps is normally open, allowing condensate and air to flow out. The vent closes immediately when steam enters to prevent energy loss. Use them with heat exchangers, air-heating coils, and drip stations in steam lines.

Style A—Style A has an inlet and an outlet on each side to connect inline or parallel steam and condensate lines.

Style B—Style B has an inlet and an outlet on the same side to connect parallel steam and condensate lines.

Style C—Style C has an inlet and outlet on opposite sides to connect inline steam and condensate lines.

	Pipe Size	Thread Type	Gender	Pipeline Orientation	Fitting Connection	Max. Pressure, psi	Max. Temp., ° F	Condensate Cap., lb/hr	Lg.	Ht.	Includes		Each
Iron with Stainless Steel Float



	A	3/4	NPT	Female	Horizontal	Threaded	15	250	1,075	3 5/16"	5 3/4"	Two Plugs for Unused Ports	0000000	0000000


	A	3/4	NPT	Female	Horizontal	Threaded	30	270	1,370	3 5/16"	5 3/4"	Two Plugs for Unused Ports	0000000	000000
	A	3/4	NPT	Female	Horizontal	Threaded	75	320	1,450	3 5/16"	5 3/4"	Two Plugs for Unused Ports	0000000	000000
	A	3/4	NPT	Female	Horizontal	Threaded	125	350	1,190	3 5/16"	5 3/4"	Two Plugs for Unused Ports	0000000	000000
	A	1	NPT	Female	Horizontal	Threaded	15	250	1,075	3 5/16"	5 3/4"	Two Plugs for Unused Ports	0000000	000000
	A	1	NPT	Female	Horizontal	Threaded	30	270	1,370	3 5/16"	5 3/4"	Two Plugs for Unused Ports	0000000	000000
	A	1	NPT	Female	Horizontal	Threaded	75	320	1,450	3 5/16"	5 3/4"	Two Plugs for Unused Ports	0000000	000000
	A	1	NPT	Female	Horizontal	Threaded	125	350	1,190	3 5/16"	5 3/4"	Two Plugs for Unused Ports	0000000	000000
	A	1 1/4	NPT	Female	Horizontal	Threaded	15	250	2,340	3 5/16"	5 3/4"	Two Plugs for Unused Ports	0000000	000000
	A	1 1/4	NPT	Female	Horizontal	Threaded	30	270	2,000	3 5/16"	5 3/4"	Two Plugs for Unused Ports	0000000	000000
	B	1 1/4	NPT	Female	Horizontal	Threaded	75	320	5,400	3"	8 3/8"	—	0000000	000000


	B	1 1/4	NPT	Female	Horizontal	Threaded	125	350	4,500	3"	8 3/8"	—	0000000	000000
	B	1 1/2	NPT	Female	Horizontal	Threaded	15	250	7,600	3"	8 3/8"	—	0000000	000000
	B	1 1/2	NPT	Female	Horizontal	Threaded	30	270	7,000	3"	8 3/8"	—	0000000	000000
	B	1 1/2	NPT	Female	Horizontal	Threaded	75	320	5,400	3"	8 3/8"	—	0000000	000000
	B	1 1/2	NPT	Female	Horizontal	Threaded	125	350	4,500	3"	8 3/8"	—	0000000	000000
	B	2	NPT	Female	Horizontal	Threaded	15	250	10,900	4 15/16"	9 1/8"	—	0000000	000000
	B	2	NPT	Female	Horizontal	Threaded	30	270	10,000	4 15/16"	9 1/8"	—	0000000	00000000
	B	2	NPT	Female	Horizontal	Threaded	75	320	7,700	4 15/16"	9 1/8"	—	0000000	00000000
	B	2	NPT	Female	Horizontal	Threaded	125	350	6,600	4 15/16"	9 1/8"	—	0000000	00000000
	C	1/2	NPT	Female	Horizontal	Threaded	15	450	1,075	4 13/16"	5 13/16"	—	00000000	000000


	C	1/2	NPT	Female	Horizontal	Threaded	30	450	1,370	4 13/16"	5 13/16"	—	00000000	000000
	C	1/2	NPT	Female	Horizontal	Threaded	75	450	1,450	4 13/16"	5 13/16"	—	00000000	000000
	C	1/2	NPT	Female	Horizontal	Threaded	125	450	1,190	4 13/16"	5 13/16"	—	00000000	000000
	C	1/2	NPT	Female	Horizontal	Threaded	200	450	985	4 13/16"	5 13/16"	—	00000000	000000
	C	3/4	NPT	Female	Horizontal	Threaded	15	450	1,075	4 13/16"	5 13/16"	—	00000000	000000
	C	3/4	NPT	Female	Horizontal	Threaded	30	450	1,370	4 13/16"	5 13/16"	—	00000000	000000
	C	3/4	NPT	Female	Horizontal	Threaded	75	450	1,450	4 13/16"	5 13/16"	—	00000000	000000
	C	3/4	NPT	Female	Horizontal	Threaded	125	450	1,190	4 13/16"	5 13/16"	—	00000000	000000
	C	3/4	NPT	Female	Horizontal	Threaded	200	450	985	4 13/16"	5 13/16"	—	00000000	000000
	C	1	NPT	Female	Horizontal	Threaded	15	450	1,075	4 13/16"	5 13/16"	—	00000000	000000


	C	1	NPT	Female	Horizontal	Threaded	30	450	1,370	4 13/16"	5 13/16"	—	00000000	000000
	C	1	NPT	Female	Horizontal	Threaded	75	450	1,450	4 13/16"	5 13/16"	—	00000000	000000
	C	1	NPT	Female	Horizontal	Threaded	125	450	1,190	4 13/16"	5 13/16"	—	00000000	000000
	C	1	NPT	Female	Horizontal	Threaded	200	450	985	4 13/16"	5 13/16"	—	00000000	000000

Large-Diameter Remote-Discharge ASME-Code Fast-Acting Pressure-Relief Valves for Air and Inert Gas

These valves meet ASME Code Section VIII for use with air and inert gas pressure vessels. Commonly used with high-volume blowers, compressors, and air-powered conveyors, they quickly relieve a large amount of air in systems with a pipe size of 2 or greater. They 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. Valves have a cast iron body to absorb vibration for reduced noise and wear in your pipeline.

NPT Male Inlet and NPT Female Relief Port

Image of Product. Front orientation. Pressure-Relief Valves. Large-Diameter Remote-Discharge ASME-Code Fast-Acting Pressure-Relief Valves for Air and Inert Gas.

Inlet			Relief
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Shape	Overall Ht.	For Use With	Temp. Range, ° F	Test Mechanism	Valve Type	Certification	Choose a Set Pressure, psi		Each







			Cast Iron Body—Bronze Seal

			2	Bottom	60	2	Side	90° Elbow	7"	Air, Inert Gas	-20 to 406	T-Handle	Pop Safety	ASME BPVC.VIII	16 , 18 , 20 , 22 , 24 , 26 , 28 , 30 , 32 , 34 , 36 , 38 , 40 , 42 , 44 , 46 , 48 , 50 , 52 , 54 , 56 , 58 , 60	0000000	0000000


			2 1/2	Bottom	60	2 1/2	Side	90° Elbow	8"	Air, Inert Gas	-20 to 406	T-Handle	Pop Safety	ASME BPVC.VIII	16 , 18 , 20 , 22 , 24 , 26 , 28 , 30 , 32 , 34 , 36 , 38 , 40 , 42 , 44 , 46 , 48 , 50 , 52 , 54 , 56 , 58 , 60	0000000	000000
			3	Bottom	60	3	Side	90° Elbow	9"	Air, Inert Gas	-20 to 406	T-Handle	Pop Safety	ASME BPVC.VIII	16 , 18 , 20 , 22 , 24 , 26 , 28 , 30 , 32 , 34 , 36 , 38 , 40 , 42 , 44 , 46 , 48 , 50 , 52 , 54 , 56 , 58 , 60	0000000	00000000

Large-Diameter Remote-Discharge Fast-Acting Pressure-Relief Valves for Air and Inert Gas

Commonly used with high-volume blowers, compressors, and air-powered conveyors, these valves quickly relieve a large amount of air in systems with a pipe size of 2 or greater. They 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. Valves have a cast iron body to absorb vibration for reduced noise and wear in your pipeline.

NPT Male Inlet and NPT Female Relief Port

Image of Product. Front orientation. Pressure-Relief Valves. Large-Diameter Remote-Discharge Fast-Acting Pressure-Relief Valves for Air and Inert Gas.

Inlet			Relief
Pipe Size	Location	Max. Pressure, psi	Port Pipe Size	Port Location	Shape	Overall Ht.	For Use With	Temp. Range, ° F	Test Mechanism	Valve Type	Choose a Set Pressure, psi		Each







			Cast Iron Body—Bronze Seal

			2	Bottom	60	2	Side	90° Elbow	7"	Air, Inert Gas	-20 to 406	T-Handle	Pop Safety	2 , 4 , 6 , 8 , 10 , 12 , 14	0000000	0000000


			2 1/2	Bottom	60	2 1/2	Side	90° Elbow	8"	Air, Inert Gas	-20 to 406	T-Handle	Pop Safety	2 , 4 , 6 , 8 , 10 , 12 , 14	0000000	000000
			3	Bottom	60	3	Side	90° Elbow	9"	Air, Inert Gas	-20 to 406	T-Handle	Pop Safety	2 , 4 , 6 , 8 , 10 , 12 , 14	0000000	00000000