Cast Iron Pressure Regulators

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	Body Material Body Material	Show

Iron

Cast Iron

	Body Material Body Material	Hide

Brass/Stainless Steel

Graphite

	For Use With For Use With

	Outlet Pipe Size Outlet Pipe Size

	Inlet Pipe Size Inlet Pipe Size

	Maximum Inlet Pressure Maximum Inlet Pressure

Less than 250 psi

250 to 499 psi

	Valve Type Valve Type

Back-Pressure Regulator

Pop Safety

Pressure Regulator

	Outlet Pressure Outlet Pressure

0-10 psi

0-25 psi

2-15 psi

2-20 psi

2-25 psi

2-30 psi

3-20 psi

5-50 psi

10-30 psi

10-35 psi

10-45 psi

10-50 psi

10-55 psi

10-60 psi

10-100 psi

20-50 psi

20-60 psi

20-70 psi

20-85 psi

20-100 psi

20-150 psi

30-50 psi

30-75 psi

30-100 psi

30-125 psi

40-85 psi

40-100 psi

40-110 psi

40-125 psi

40-200 psi

45-100 psi

50-110 psi

50-125 psi

50-150 psi

50-230 psi

55-100 psi

75-175 psi

90-125 psi

90-150 psi

100-200 psi

105-125 psi

125-300 psi

150-400 psi

175-380 psi

200-400 psi

300-400 psi

	Valve Function Valve Function

Pressure Regulation

Pressure Relief

Back-Pressure Regulation

	Inlet Thread Type Inlet Thread Type

NPT

	Seal Material Seal Material

Plastic

	Inlet Connection Type Inlet Connection Type

	Pipe

	Outlet Thread Type Outlet Thread Type

NPT

	Flow Coefficient (Cv) Flow Coefficient (Cv)

	Outlet Connection Type Outlet Connection Type

	Pipe

	Activation Activation

Pressure Driven

	Inlet Location Inlet Location

Side

Bottom

	Outlet Gender Outlet Gender

Female

	Diaphragm Material Diaphragm Material

Rubber

Stainless Steel

Bronze

Nickel

	End-to-End Length End-to-End Length

	Outlet Connection Style Outlet Connection Style

Threaded

	Shape Shape


Straight	90° Elbow

	Outlet Location Outlet Location

Side

	Outlet Pressure Adjustment Method Outlet Pressure Adjustment Method

Screw

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58 Products

About Pressure-Relief Valves

For Use With: Water, Oil, Air, Inert Gas
Temperature Range: See Table

A cast iron body absorbs vibration from pressure changes to reduce wear and noise in your pipeline. These valves automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range.

Internal strainers trap debris.

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

Inlet			Outlet
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Temperature Range	End-to-End Lg.	Choose an Outlet Pressure Range, psi		Each
NPT Female
Cast Iron Body—Buna-N Diaphragm and Seal with Internal Strainer
1/4	Side	200	1/4	Side	32° to 180° F	3"	2 to 25, 20 to 60, 20 to 100, 50 to 150	0000000	0000000
3/8	Side	200	3/8	Side	32° to 180° F	3 7/8"	2 to 30, 20 to 70, 40 to 110, 90 to 150	0000000	000000
1/2	Side	200	1/2	Side	32° to 180° F	4 1/2"	2 to 30, 10 to 50, 30 to 125, 50 to 125	0000000	000000
3/4	Side	200	3/4	Side	32° to 180° F	5 1/8"	2 to 20, 10 to 35, 30 to 75, 50 to 110, 105 to 125	0000000	000000
1	Side	200	1	Side	32° to 180° F	5 7/8"	2 to 20, 10 to 45, 20 to 60, 55 to 100, 90 to 125	0000000	000000
1 1/4	Side	200	1 1/4	Side	32° to 180° F	6 3/4"	2 to 15, 10 to 30, 20 to 50, 45 to 100, 90 to 150	0000000	000000
1 1/2	Side	200	1 1/2	Side	32° to 180° F	6 3/4"	2 to 15, 10 to 30, 20 to 50, 45 to 100, 90 to 125	0000000	000000
2	Side	200	2	Side	32° to 180° F	9 1/4"	2 to 20, 10 to 60, 20 to 100, 90 to 125	0000000	000000
Cast Iron Body—Fluoroelastomer Diaphragm and 420 Stainless Steel Seal
3/8	Side	250	3/8	Side	32° to 300° F	4 1/4"	0 to 10, 10 to 50, 40 to 100, 100 to 200	0000000	000000
1/2	Side	250	1/2	Side	32° to 300° F	3 5/8"	0 to 10, 10 to 50, 40 to 100, 100 to 200	0000000	000000
3/4	Side	250	3/4	Side	32° to 300° F	3 5/8"	0 to 10, 10 to 50, 40 to 100, 100 to 200	0000000	000000
1	Side	250	1	Side	32° to 300° F	4 1/2"	0 to 10, 10 to 30, 30 to 50, 40 to 85	0000000	000000
2	Side	250	2	Side	32° to 300° F	6 1/2"	0 to 10, 10 to 30, 30 to 50, 40 to 85	0000000	000000

Pressure-Regulating Valves for Steam

For Use With: Steam
Temperature Range: -20° to 400° F

Automatically reduce a high, variable inlet pressure in your steam system to a lower, stable outlet pressure. Adjust the outlet pressure within the range. These valves have a cast iron body that absorbs vibration from pressure changes to reduce wear and noise in your pipeline.

Internal strainers trap debris.

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

Valves
Inlet			Outlet						Repair Kits
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	End-to-End Lg.	Choose an Outlet Pressure Range, psi		Each		Each
NPT Female
Cast Iron Body—Bronze Diaphragm and 420 Stainless Steel Seal
1/2	Side	250	1/2	Side	3 5/8"	0 to 10, 10 to 50, 100 to 200, 40 to 100	0000000	0000000	0000000	000000
3/4	Side	250	3/4	Side	3 5/8"	0 to 10, 10 to 50, 100 to 200, 40 to 100	0000000	000000	0000000	00000
1	Side	250	1	Side	4 1/2"	0 to 10, 10 to 30, 30 to 50, 40 to 85	0000000	000000	0000000	000000
1 1/4	Side	250	1 1/4	Side	4 1/2"	0 to 10, 10 to 30, 30 to 50, 40 to 85	0000000	000000	0000000	000000
1 1/2	Side	250	1 1/2	Side	6 1/2"	0 to 10, 10 to 30, 30 to 50, 40 to 85	0000000	000000	0000000	000000
2	Side	250	2	Side	6 1/2"	0 to 10, 10 to 30, 30 to 50, 40 to 85	0000000	000000	0000000	000000
Cast Iron Body—Bronze Diaphragm and PTFE Seal with Internal Strainer
1/4	Side	150	1/4	Side	3"	2 to 25, 20 to 60, 30 to 100, 50 to 125	0000000	000000	000000	00
3/8	Side	150	3/8	Side	3 7/8"	2 to 30, 20 to 100, 50 to 125	0000000	000000	000000	00
1/2	Side	150	1/2	Side	4 1/2"	10 to 50, 2 to 30, 30 to 125, 50 to 125	0000000	000000	0000000	000000
3/4	Side	150	3/4	Side	5 1/8"	10 to 35, 105 to 125, 2 to 20, 30 to 75, 50 to 110	0000000	000000	0000000	000000
1	Side	150	1	Side	5 7/8"	10 to 45, 2 to 20, 20 to 60, 55 to 100, 90 to 125	0000000	000000	0000000	000000
1 1/4	Side	150	1 1/4	Side	6 3/4"	10 to 30, 2 to 15, 20 to 50, 45 to 100, 90 to 125	0000000	000000	0000000	000000
1 1/2	Side	150	1 1/2	Side	6 3/4"	10 to 30, 2 to 15, 20 to 50, 45 to 100, 90 to 125	0000000	000000	0000000	000000
2	Side	150	2	Side	9 1/4"	10 to 60, 2 to 20, 20 to 100, 90 to 125	0000000	000000	0000000	000000

High-Accuracy Pressure-Regulating Valves for Steam

For Use With: Steam
Temperature Range: 40° to 450° F

Control steam line pressure with ±1 psi accuracy. These valves automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. Valves have a cast iron body that absorbs vibration from pressure changes to reduce wear and noise in your pipeline. They meet ANSI Class IV for tight shut-off (max. leakage rate of 0.01%). Install 1/4 NPT male pipe (not included) between the control valve and your downstream steam line.

Repair kits (sold separately) include replacement seals, diaphragm, spring, and spring assembly.

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

Valves
Inlet			Outlet					Repair Kits
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Choose an Outlet Pressure Range, psi		Each		Each
NPT Female
Cast Iron Body—301 Stainless Steel Diaphragm and 420 Stainless Steel Seal
1/2	Side	250	1/2	Side	3 to 20, 5 to 50, 10 to 100, 20 to 150	0000000	000000000	0000000	0000000
3/4	Side	250	3/4	Side	3 to 20, 5 to 50, 10 to 100, 20 to 150	0000000	00000000	0000000	000000
1	Side	250	1	Side	3 to 20, 5 to 50, 10 to 100, 20 to 150	0000000	00000000	0000000	000000
1 1/4	Side	250	1 1/4	Side	3 to 20, 5 to 50, 10 to 100, 20 to 150	0000000	00000000	0000000	000000
1 1/2	Side	250	1 1/2	Side	3 to 20, 5 to 50, 10 to 100, 20 to 150	0000000	00000000	0000000	000000
2	Side	250	2	Side	3 to 20, 5 to 50, 10 to 100, 20 to 150	0000000	00000000	0000000	000000

Back-Pressure-Regulating Valves for Water and Oil

For Use With: Water, Oil
Temperature Range: -40° to 200° F

Commonly used as bypass lines after centrifugal, reciprocating, and rotary pumps, these valves obstruct flow to maintain sufficient operating pressure in your system. If the system pressure exceeds the set pressure, they exhaust through the threaded relief port. Adjust the set pressure within the range. Valves have a cast iron body that absorbs vibration from pressure changes to reduce wear and noise in your pipeline.

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

Inlet			Outlet		Relief Port
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pipe Size	Location	End-to-End Lg.	Choose an Outlet Pressure Range, psi		Each
NPT Female
Cast Iron Body—Nickel Alloy Diaphragm and Brass Seal
1/2	Side	400	1/2	Side	1/2	Bottom	2 7/8"	0 to 25, 5 to 50, 30 to 100, 75 to 175, 150 to 400	0000000	0000000
1 1/4	Side	400	1 1/4	Side	1 1/4	Bottom	4 1/4"	20 to 85, 40 to 125, 50 to 230, 175 to 380, 300 to 400	0000000	00000000
1 1/2	Side	400	1 1/2	Side	1 1/2	Bottom	5"	10 to 55, 30 to 100, 40 to 200, 125 to 300, 200 to 400	0000000	00000000
2	Side	400	2	Side	2	Bottom	5"	10 to 55, 30 to 100, 40 to 200, 125 to 300, 200 to 400	0000000	00000000

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

For Use With: Air, Inert Gas
Specifications Met: ASME BPVC.VIII
Temperature Range: -20° to 406° F

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.

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

Inlet		Relief Port
Pipe Size	Location	Pipe Size	Location	Overall Ht.	Test Mechanism	Valve Type	Choose a Set Pressure, psi		Each
NPT Male Inlet and NPT Female Relief Port
Cast Iron Body—Bronze Seal
2	Bottom	2	Side	7"	T-Handle	Pop Safety	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	2 1/2	Side	8"	T-Handle	Pop Safety	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	3	Side	9"	T-Handle	Pop Safety	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

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

For Use With: Air, Inert Gas
Temperature Range: -20° to 406° F

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.

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

Inlet		Relief Port
Pipe Size	Location	Pipe Size	Location	Temperature Range, ° F	Overall Ht.	Test Mechanism	Valve Type	Choose a Set Pressure, psi		Each
NPT Male Inlet and NPT Female Relief Port
Cast Iron Body—Bronze Seal
2	Bottom	2	Side	-20° to 406°	7"	T-Handle	Pop Safety	2, 4, 6, 8, 10, 12, 14	0000000	0000000
2 1/2	Bottom	2 1/2	Side	-20° to 406°	8"	T-Handle	Pop Safety	2, 4, 6, 8, 10, 12, 14	0000000	000000
3	Bottom	3	Side	-20° to 406°	9"	T-Handle	Pop Safety	2, 4, 6, 8, 10, 12, 14	0000000	000000

Pressure-Regulating Inline Hydraulic Valves

When input pressure varies, use these valves to maintain a consistent pressure. They are often placed after a directional-control valve and before an actuator, such as a cylinder. They have an indicator/gauge port for the inlet and one for the outlet so you can monitor that output pressure remains steady.

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

Inlet/Outlet Connection		Relief Connection		O'all
Pipe Size	Dash Size	Pipe Size	Dash Size	Lg.	Wd.	Ht.	Choose a Set Pressure Range, psi		Each
NPT Female Inlet and Relief Port
Cast Iron Body
3/4	12	1/4	04	5 7/8"	3 3/4"	7 1/8"	100 to 1000, 500 to 2000, 1000 to 3000	000000	0000000

Terms and Conditions and Privacy Policy

About Pressure-Relief Valves

Vibration-Damping Pressure-RegulatingValves for Water, Oil, Air, and Inert Gas

Pressure-Regulating Valves for Steam

High-Accuracy Pressure-Regulating Valves for Steam

Back-Pressure-Regulating Valves for Water and Oil

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

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

Pressure-Regulating Inline Hydraulic Valves

Vibration-Damping Pressure-Regulating
Valves for Water, Oil, Air, and Inert Gas

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

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