Pressure-Relief Valves For Oil

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Inlet Pipe Size

Outlet Pressure

Maximum Inlet Pressure

Less than 500 psi

500 psi to 999 psi

1,000 psi to 1,999 psi

2,000 psi to 3,999 psi

Valve Function

Back-Pressure Regulation

Body Material

Inlet Thread Type

Outlet Pipe Size

Set Pressure

Shape

Relief Port Pipe Size

Maximum Temperature

Valve Type

Back-Pressure Regulator

Seal Material

Flow Coefficient (Cv)

Actuation

Set Pressure Configuration

Inlet Connection

Outlet Thread Type

Minimum Temperature

Inlet Connection Port

REACH

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Compliant with Exemptions

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Export Control Classification Number (ECCN)

2B999

EAR99

DFARS Specialty Metals

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71 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

About Pressure-Relief Valves

Compact Pressure-Relief Valves

Due to their small size, these valves are often installed on tanks in low-clearance areas. They begin opening at the set pressure. Nylon valves fully open at about 10% over the set pressure and steel valves fully open at about 50% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. All have a vent outlet to exhaust discharge directly. Set pressure is not adjustable.

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

Steel Body—For Grease and Oil

For Use With: Grease, Oil
Temperature Range: Not Rated

Inlet								Each
Pipe Size	Location	Maximum Pressure, psi	Relief Port Location	Overall Ht.	Specifications Met	Set Pressure, psi		1-9	10-Up
NPTF Male Inlet and Relief Vent
1/8	Bottom	5	Top	1/2"	MS35670	1	000000	00000	00000
1/8	Bottom	15	Top	1/2"	MS35670	7.5	000000	0000	0000
1/8	Bottom	25	Top	1/2"	MS35670	15	000000	0000	0000
1/8	Bottom	80	Top	1/2"	MS35670	45	000000	0000	0000
1/8	Bottom	140	Top	9/16"	MS35670	80	0000000	0000	0000
1/8	Bottom	200	Top	1/2"	__	100	0000000	0000	0000
1/8	Bottom	650	Top	1/2"	__	400	0000000	0000	0000
BSPT Male Inlet and Relief Vent
1/8	Bottom	1	Top	1/2"	__	0.3	0000000	0000	0000
1/8	Bottom	5	Top	1/2"	__	1	0000000	0000	0000
1/8	Bottom	80	Top	1/2"	__	45	0000000	0000	0000

Pressure-Relief Valves for Oil

For Use With: Oil
Temperature Range: -320° to 420° F

These valves are often used in hydraulic and lubrication systems. They begin opening at the set pressure and fully open at about 10% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Adjust the set pressure within the range.

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

Inlet			Relief Port
Pipe Size	Location	Maximum Pressure, psi	Pipe Size	Location	Set Pressure Adjustment Method	Overall Ht.	Choose a Set Pressure Range, psi		Each
NPT Male Inlet and NPT Female Relief Port
Bronze Body—316 Stainless Steel Seal
1/2	Bottom	1,400	3/4	Side	External Adjustment Screw	7 1/4"	15 to 75, 50 to 150, 100 to 300, 200 to 600, 600 to 900	0000000	0000000
3/4	Bottom	1,400	3/4	Side	External Adjustment Screw	7 1/4"	15 to 75, 50 to 150, 100 to 300	0000000	000000
1	Bottom	1,400	1	Side	External Adjustment Screw	7 1/2"	15 to 75, 50 to 150, 100 to 300, 200 to 600, 600 to 900	0000000	000000
1 1/4	Bottom	1,400	1 1/4	Side	External Adjustment Screw	8"	15 to 75, 50 to 150, 100 to 300, 200 to 600, 600 to 900	0000000	000000
1 1/2	Bottom	1,400	1 1/2	Side	External Adjustment Screw	8 7/8"	15 to 75, 50 to 150, 100 to 300, 200 to 600	0000000	00000000

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

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	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"	10 to 50, 2 to 30, 30 to 125, 50 to 125	0000000	000000
3/4	Side	200	3/4	Side	32° to 180° F	5 1/8"	10 to 35, 105 to 125, 2 to 20, 30 to 75, 50 to 110	0000000	000000
1	Side	200	1	Side	32° to 180° F	5 7/8"	10 to 45, 2 to 20, 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"	10 to 30, 2 to 15, 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"	10 to 30, 2 to 15, 20 to 50, 45 to 100, 90 to 125	0000000	000000
2	Side	200	2	Side	32° to 180° F	9 1/4"	10 to 60, 2 to 20, 20 to 100, 90 to 125	0000000	00000000
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, 100 to 200, 40 to 100	0000000	000000
1/2	Side	250	1/2	Side	32° to 300° F	3 5/8"	0 to 10, 10 to 50, 100 to 200, 40 to 100	0000000	000000
3/4	Side	250	3/4	Side	32° to 300° F	3 5/8"	0 to 10, 10 to 50, 100 to 200, 40 to 100	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 Water, Oil, Air, and Inert Gas

Valve With Buna-N Diaphragm

Valve With Buna-N
Diaphragm And
Gauge Port

Valve With Neoprene Diaphragm

Valve With Neoprene
Diaphragm
And Gauge Port

For Use With: Water, Oil, Air, Inert Gas
Temperature Range: 32° to 180° F

These valves automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range.

Valves with a neoprene diaphragm have higher flow rates than valves with a Buna-N diaphragm.

Internal strainers trap debris.

Gauge ports let you attach a pressure gauge to monitor outlet pressure.

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

Inlet			Outlet
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	End-to-End Lg.	Choose an Outlet Pressure Range, psi		Each
Valve
NPT Female
Brass Body—Buna-N Diaphragm and Seal with Internal Strainer
1/4	Side	250	1/4	Side	2 1/4"	2 to 30, 10 to 50, 25 to 90, 80 to 120, 100 to 180	0000000	0000000
3/8	Side	250	3/8	Side	2 1/4"	2 to 30, 10 to 50, 25 to 90, 80 to 120, 100 to 180	0000000	000000
Brass Body—Neoprene Diaphragm and Buna-N Seal
1/4	Side	400	1/4	Side	2 1/2"	0 to 5, 2 to 35, 20 to 70, 60 to 125, 75 to 200, 100 to 250	0000000	000000
3/8	Side	400	3/8	Side	2 1/2"	0 to 5, 2 to 35, 20 to 70, 60 to 125, 75 to 200, 100 to 250	0000000	000000
1/2	Side	400	1/2	Side	2 7/8"	0 to 5, 2 to 25, 20 to 60, 40 to 80, 75 to 125, 100 to 250	0000000	000000
Valve with 1/4 NPT Gauge Port
NPT Female
Brass Body—Buna-N Diaphragm and Seal with Internal Strainer
1/4	Side	250	1/4	Side	2 1/4"	2 to 30, 10 to 50, 25 to 90, 80 to 120, 100 to 180	0000000	000000
3/8	Side	250	3/8	Side	2 1/4"	2 to 30, 10 to 50, 25 to 90, 80 to 120, 100 to 180	0000000	000000
Brass Body—Neoprene Diaphragm and Buna-N Seal
1/4	Side	400	1/4	Side	2 1/2"	0 to 5, 2 to 35, 20 to 70, 60 to 125, 75 to 200, 100 to 250	0000000	000000
3/8	Side	400	3/8	Side	2 1/2"	0 to 5, 2 to 35, 20 to 70, 60 to 125, 75 to 200, 100 to 250	0000000	000000
1/2	Side	400	1/2	Side	2 7/8"	0 to 5, 2 to 25, 20 to 60, 40 to 80, 75 to 125, 100 to 250	0000000	000000

Extended-Life Pressure-Regulating Valves for Water, Oil, Air, and Inert Gas

For Use With: Water, Oil, Air, Inert Gas
Temperature Range: 32° to 180° F

For a longer service life than brass and cast iron valves, these have a durable bronze body. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. All valves have an internal strainer to 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	End-to-End Lg.	Choose an Outlet Pressure Range, psi		Each
NPT Female
Bronze Body—Buna-N Diaphragm and Seal
1/4	Side	400	1/4	Side	3"	2 to 25, 20 to 60, 20 to 100, 50 to 150	00000000	0000000
3/8	Side	400	3/8	Side	3 7/8"	2 to 30, 20 to 70, 40 to 110, 90 to 150	00000000	000000
1/2	Side	400	1/2	Side	4 1/2"	2 to 30, 10 to 50, 30 to 125, 50 to 150	00000000	000000
3/4	Side	400	3/4	Side	5 1/8"	2 to 20, 10 to 35, 30 to 75, 50 to 110, 105 to 150	00000000	000000
1	Side	400	1	Side	5 7/8"	2 to 20, 10 to 45, 20 to 60, 55 to 100, 90 to 150	00000000	000000
1 1/4	Side	400	1 1/4	Side	6 3/4"	2 to 15, 10 to 30, 20 to 50, 45 to 100, 90 to 150	00000000	00000000
1 1/2	Side	400	1 1/2	Side	6 3/4"	2 to 15, 10 to 30, 20 to 50, 45 to 100, 90 to 150	00000000	00000000
2	Side	400	2	Side	9 1/4"	2 to 20, 10 to 60, 20 to 100, 90 to 150	00000000	00000000

Corrosion-Resistant Pressure-Regulating
Valves for Water, Oil, Air, and Inert Gas

For Use With: Water, Oil, Air, Inert Gas
Temperature Range: 32° to 200° F

Often used in wet conditions and harsh environments, these valves have a 316 stainless steel body for excellent corrosion resistance. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range.

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

Inlet			Outlet
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	End-to-End Lg.	Choose an Outlet Pressure Range, psi		Each
NPT Female
316 Stainless Steel Body—Buna-N Diaphragm and Seal
1/2	Side	720	1/2	Side	4 1/2"	2 to 30, 10 to 50, 30 to 125, 50 to 150	0000000	000000000
3/4	Side	720	3/4	Side	5 1/8"	2 to 20, 10 to 35, 30 to 75, 50 to 110, 105 to 150	0000000	00000000
1	Side	720	1	Side	5 7/8"	2 to 20, 10 to 45, 20 to 60, 55 to 100, 90 to 150	0000000	00000000

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

For Use With: Water, Oil, Air, Inert Gas
Temperature Range: 32° to 300° F

Withstand more than six times the inlet pressure of standard pressure-regulating valves. 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 303 stainless steel body for corrosion resistance in harsh environments.

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

Inlet			Outlet
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Port-to-Port Lg.	Choose an Outlet Pressure Range, psi		Each
NPT Female
303 Stainless Steel Body—PTFE Seal
2	Side	3,000	2	Bottom	3"	100 to 450, 250 to 1,200, 500 to 2,200	0000000	000000000

High-Temperature Pressure-Regulating Valves for Water, Oil, Air, and Inert Gas

For Use With: Water, Oil, Air, Inert Gas
Temperature Range: 32° to 550° F

Rated for more than double the temperature of standard pressure-regulating valves, these can withstand temperatures up to 550° F. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. Valves meet ANSI/FCI 70-2 Class IV for tight shut-off (max. leakage rate of 0.01%).

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

Inlet			Outlet
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	End-to-End Lg.	Choose an Outlet Pressure Range, psi		Each
NPT Female
Steel Body—316 Stainless Steel Diaphragm and 303 Stainless Steel Seal
1/2	Side	300	1/2	Side	3 5/8"	2 to 23, 10 to 38, 20 to 55, 35 to 160, 95 to 220	00000000	000000000
3/4	Side	300	3/4	Side	3 5/8"	2 to 23, 10 to 38, 20 to 55, 35 to 160, 95 to 220	00000000	00000000
1	Side	300	1	Side	4 3/16"	5 to 20, 10 to 30, 20 to 45, 30 to 95, 60 to 160	00000000	00000000
1 1/2	Side	300	1 1/2	Side	4 13/16"	5 to 20, 10 to 30, 20 to 45, 30 to 95, 60 to 160	00000000	00000000
2	Side	300	2	Side	5 1/2"	5 to 20, 10 to 30, 20 to 45, 30 to 95, 60 to 160	00000000	00000000

Extended-Life Back-Pressure-Regulating Valves for Water and Oil

For Use With: Water, Oil
Temperature Range: -40° to 450° F

For a longer service than cast iron valves, these have a durable bronze body and a 303 stainless steel seal. Commonly installed as bypass lines after centrifugal, reciprocating, and rotary pumps, they obstruct flow to maintain sufficient operating pressure in your system. If the system pressure exceeds the set pressure, they exhaust through the outlet. Adjust the set pressure within the range.

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

Inlet			Outlet
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Port-to-Port Lg.	Choose an Outlet Pressure Range, psi		Each
NPT Female
Bronze Body—303 Stainless Steel Seal
1/4	Bottom	600	1/4	Side	1 1/4"	15 to 30, 25 to 75, 50 to 140, 100 to 300, 200 to 600	0000000	0000000
3/8	Bottom	600	3/8	Side	1 1/4"	15 to 30, 25 to 75, 50 to 140, 100 to 300, 200 to 600	0000000	000000
1/2	Bottom	600	1/2	Side	1 5/8"	15 to 75, 50 to 150, 100 to 300, 200 to 600	0000000	000000
3/4	Bottom	600	3/4	Side	1 5/8"	15 to 75, 50 to 150, 100 to 300, 200 to 600	0000000	000000
1	Bottom	600	1	Side	2 1/4"	15 to 75, 50 to 150, 100 to 300, 200 to 600	0000000	000000
1 1/4	Bottom	600	1 1/4	Side	2 1/4"	15 to 75, 50 to 150, 100 to 300, 200 to 600	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 303 Stainless Steel 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	000000000
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

Aluminum Quick-Connect Pipe Fittings for Compressed Air

Twist these fittings onto aluminum pipe for quick, sealed connections—no threading, soldering, or welding necessary. Use them to build a compressed air system in half the time it would take to build a copper or steel system. Also known as Unipipe fittings, they’re part of a quick-connect system that’s compatible with pipe from Unipipe, Transair, and Infinity.

Finger tighten the collar on the end of these fittings, then use a wrench for the final quarter turn. The inside of these fittings has a compression ring and O-ring to seal against the pipe. They’re easy to take apart as needed to modify your setup.

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

Plugs, Female Quick Connect

For Use With: Air, Coolant, Nitrogen, Oil
Temperature Range: 0° to 210° F
Specifications Met: ASME B31.1, ASME B31.3, ASME B31.9
Pipe Nipples and Pipe: Use Quick-Disconnect Aluminum

Plugs block the end of a fitting. They include a ¼ BSPP valve that can be used to exhaust your line or attach a pressure gauge. To install, remove the fitting's nut, collar, and grip ring. Insert the plug into the fitting, slide the collar on, and tighten the nut. Discard the connector's grip ring.

For Pipe OD	Socket Dp., mm	Lg., mm	Material	Max. Pressure		Each
1/2" (20 mm)	23	40	Epoxy-Coated 6061 Aluminum	1,015 psi @ 72° F	0000000	000000
1" (25 mm)	31	49	Epoxy-Coated 6061 Aluminum	1,015 psi @ 72° F	0000000	00000
1 1/2" (40 mm)	43	62	Epoxy-Coated 6061 Aluminum	1,015 psi @ 72° F	0000000	00000

Wrenches

For Pipe OD	Drive Size, mm	Overall Lg., mm	Head Thick., mm	Material		Each
3/4" (20 mm)	20	172	5	Galvanized Steel	0000000	000000
1" (25 mm)	25	192	5	Galvanized Steel	0000000	00000
1 1/2" (40 mm)	40	245	5	Galvanized Steel	0000000	00000

How to Identify and Measure Fittings

About Pressure-Relief Valves

Compact Pressure-Relief Valves

Pressure-Relief Valves for Oil

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

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

Extended-Life Pressure-Regulating Valves for Water, Oil, Air, and Inert Gas

Corrosion-Resistant Pressure-RegulatingValves for Water, Oil, Air, and Inert Gas

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

High-Temperature Pressure-Regulating Valves for Water, Oil, Air, and Inert Gas

Extended-Life Back-Pressure-Regulating Valves for Water and Oil

Back-Pressure-Regulating Valves for Water and Oil

Aluminum Quick-Connect Pipe Fittings for Compressed Air

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

Corrosion-Resistant Pressure-Regulating
Valves for Water, Oil, Air, and Inert Gas