ASME Relief Valves | McMaster-Carr

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38 Products

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

Panel-Mount Ultra-High-Pressure-Regulating Valves for Air and Inert Gas

For Use With: Air, Nitrogen, Argon, Helium
Temperature Range: -40° to 165° F

These valves are rated for inlet pressures up to 6,000 psi. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. Threads below the adjustment knob and an included mounting bracket let you install these valves in instrument panels. They have two gauge ports. An internal strainer traps debris.

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

Inlet			Outlet		Gauge Port
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pipe Size	Location	End-to-End Lg.	Panel Cutout Dia.	Specifications Met	Choose an Outlet Pressure Range, psi		Each
NPT Female
Brass Body—Polyimide Seal
1/4	Side	6,000	1/4	Side	1/4	Side	2 1/8"	2 1/4"	ASME B31.3	0 to 500, 0 to 800, 10 to 1,500, 15 to 2,500, 25 to 4,000, 50 to 6,000	0000000	000000000

Panel-Mount High-Pressure-Regulating Valves for Air and Inert Gas

For Use With: Air, Nitrogen, Argon, Helium
Temperature Range: -40° to 165° F

Withstand inlet pressures up to 3,500 psi. These valves automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. Valves have threads below the adjustment knob and come with a panel-mount nut. All have two gauge ports. An internal strainer traps debris.

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

Inlet			Outlet		Gauge Port
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pipe Size	Location	End-to-End Lg.	Panel Cutout Dia.	Specifications Met	Choose an Outlet Pressure Range, psi		Each
NPT Female
Brass Body—316 Stainless Steel Diaphragm and PTFE Seal
1/4	Side	3,500	1/4	Side	1/4	Side	2"	1 3/8"	ASME B31.3	0 to 25, 0 to 50, 0 to 100, 0 to 250, 0 to 500	0000000	0000000

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/FCI 70-2 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	00000000

Threaded Pressure-Regulating Valves for Food and Beverage

With Knob

With Screw

For Use With: Food and Beverage
Temperature Range: 35° to 125° F

These valves are often used to regulate pressure in food and beverage lines. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. Valves have two gauge ports and come with plugs to close the unused ports.

Valves with knob have a Buna-N/Nylon diaphragm which is FDA Compliant 21 CFR 177.2600.

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

Inlet			Outlet
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pressure Adjustment Method	End-to-End Lg.	Specifications Met	Choose an Outlet Pressure Range, psi		Each
NPT Female
Acetal Body—Buna-N/Nylon Diaphragm and EPDM Seal with Knob
1/4	Side	150	1/4	Side	Knob	1 5/8"	FDA Compliant 21 CFR 177.2600, NSF/ANSI 61	5 to 50, 5 to 125	0000000	000000
Noryl PPO Body—Buna-N Diaphragm and Seal with Screw
1/4	Side	300	1/4	Side	Screw	1 9/16"	NSF/ANSI 61	0 to 25, 0 to 60, 0 to 125	0000000	000000

Pressure-Regulating Valves with Push-to-Connect Fittings for Food and Beverage

For Use With: Food and Beverage
Temperature Range: 35° to 125° F

Insert plastic or soft metal tubing into the push-to-connect fittings on these valves for a low-pressure seal in food and beverage lines. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. They have two gauge ports.

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

Inlet				Outlet
Tube Connection Type	For Tube OD	Location	Max. Pressure, psi	For Tube OD	Location	Pressure Adjustment Method	End-to-End Length	Specifications Met	Choose an Outlet Pressure Range, psi		Each
Push-to-Connect Female
Noryl PPO Body—Buna-N Diaphragm and Seal
Push to Connect	1/4"	Side	300	1/4"	Side	Screw	2 13/16"	NSF/ANSI 61	0 to 25, 0 to 60, 0 to 125	0000000	0000000

Pressure-Regulating Valves for Drinking Water

Valve

Valve With Union Fitting

For Use With: Drinking Water
Temperature Range: 33° to 140° F

These valves meet NSF/ANSI 61 for use in drinking water systems. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. All valves have a gauge port. An internal strainer traps debris. Body is bronze for durability and a long service life.

Valves with union fitting disassemble for easy installation and removal.

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

Inlet			Outlet
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pressure Range, psi	End-to-End Lg.	Specifications Met		Each
NPT Female
Bronze Body—Buna-N Diaphragm and Seal with Internal Strainer
1/2	Side	400	1/2	Side	15 to 75	3 1/2"	ASSE 1003 Listed, CSA Certified, IAPMO Listed, NSF/ANSI 61	0000000	0000000
3/4	Side	400	3/4	Side	15 to 75	3 1/2"	ASSE 1003 Listed, CSA Certified, IAPMO Listed, NSF/ANSI 61	0000000	000000
1	Side	400	1	Side	15 to 75	4"	ASSE 1003 Listed, CSA Certified, IAPMO Listed, NSF/ANSI 61	0000000	000000
Bronze Body—Buna-N Diaphragm and Seal with Internal Strainer and Union Fitting
1/2	Side	400	1/2	Side	15 to 75	4 3/8"	ASSE 1003 Listed, CSA Certified, IAPMO Listed, NSF/ANSI 61	0000000	000000
3/4	Side	400	3/4	Side	15 to 75	4 7/16"	ASSE 1003 Listed, CSA Certified, IAPMO Listed, NSF/ANSI 61	0000000	000000
1	Side	400	1	Side	15 to 75	4 15/16"	ASSE 1003 Listed, CSA Certified, IAPMO Listed, NSF/ANSI 61	0000000	000000
1 1/4	Side	400	1 1/4	Side	15 to 75	6 3/16"	ASSE 1003 Listed, CSA Certified, IAPMO Listed, NSF/ANSI 61	0000000	000000
1 1/2	Side	300	1 1/2	Side	25 to 75	6 5/16"	ASSE 1003 Listed, CSA Certified, IAPMO Listed, NSF/ANSI 61	0000000	000000
2	Side	300	2	Side	25 to 75	6 1/4"	ASSE 1003 Listed, CSA Certified, IAPMO Listed, NSF/ANSI 61	0000000	000000

Sanitary Pressure-Regulating Valves

For Use With: Food and Beverage
Temperature Range: -40° to 120°F
Specifications Met: 3-A Certified 64-00, ANSI/FCI 70-2 Class III, FDA Compliant 21 CFR 177.2600

Regulate air, gas, and liquid pressure on food, beverage, and pharmaceutical lines with these valves—they’re 3-A certified to meet sanitary design standards. Attach them to your line to reduce a high, variable inlet pressure to a lower, stable outlet pressure.

Twist the T-handle on top of the valve to adjust the outlet pressure. When the valve is closed, a seal on the outlet prevents leaks and helps maintain consistent pressure. These valves meet ANSI/FCI 70-2 Class III, which means a maximum of 0.1% of fluid, gas, or air can escape while they are fully closed. The spring and valve mechanism are sealed behind the diaphragm, so contaminants can’t enter. Both the diaphragm and seals hold up to water, detergents, and chemicals. They’re also FDA compliant for direct contact with food.

Made of 316 stainless steel, these valves won’t corrode from frequent washdowns with harsh cleaners. They connect to your line with quick-clamp sanitary fittings, also known as tri-clamp connections, which are easier to remove and sanitize than threaded connections. The polished interior is extremely smooth, so there’s nowhere for bacteria to hide. They’re also self-draining, so liquids drain completely and don’t contaminate your line. Keep these valves open during clean-in-place (CIP) cycles with a locking pin.

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

Inlet				Outlet
For Tube OD	Flange OD	Location	Max. Pressure, psi	For Tube OD	Flange OD	Location	Pressure Adjustment Method	End-to-End Lg.	Choose an Outlet Pressure Range, psi		Each
Quick Clamp
316 Stainless Steel Body—EPDM Diaphragm and EPDM Seal
3/4"	0.984"	Bottom	200	3/4"	0.984"	Side	T-Handle	8 5/8"	15 to 50, 40 to 90	0000000	000000000
1"	1.984"	Bottom	200	1"	1.984"	Side	T-Handle	8 5/8"	5 to 25, 15 to 50, 40 to 90	0000000	00000000
316 Stainless Steel Body—PTFE Plastic Diaphragm and EPDM Seal
1 1/2"	1.984"	Bottom	125	1 1/2"	1.984"	Side	T-Handle	13 3/8"	10 to 25, 15 to 50, 35 to 100	0000000	00000000
2"	2.516"	Bottom	100	2"	2.516"	Side	T-Handle	16 1/8"	10 to 25, 15 to 60	0000000	00000000

Sanitary Back-Pressure-Regulating Valves

For Use With: Food and Beverage
Temperature Range: -40° to 120°F
Specifications Met: 3-A Certified 64-00, ANSI/FCI 70-2 Class III, FDA Compliant 21 CFR 177.2600

Designed to meet 3-A sanitary standards, these valves regulate liquid, gas, and air pressure in hygienic zones of food and beverage plants. They’re often used at the end of pipelines on processing and sanitizing equipment. Made of 316 stainless steel, they won't corrode from frequent washdowns with harsh cleaners. With an extremely smooth interior that self-drains, bacteria won't have time or space to grow. The spring and internal valve mechanisms are sealed off behind the diaphragm, which also prevents contamination. They connect with quick-clamp fittings, so disassembling to clean your line takes little time.

These valves obstruct flow to maintain sufficient operating pressure in your system. If the system pressure exceeds the set pressure, they exhaust through the outlet. They meet ANSI/FCI 70-2 Class III standards for shut-off valves, meaning a maximum of 0.1% of fluid, gas, or air will escape through the outlet when they’re closed. An integrated T-handle lets you set the outlet pressure without additional tools. The diaphragm and seal resist repeated exposure to water, and they’re FDA compliant for direct contact with food.

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

Inlet				Outlet			Lg.
For Tube OD	Flange OD	Location	Max. Pressure, psi	For Tube OD	Flange OD	Location	End-to-End	Port-to-Port	Choose an Outlet Pressure Range, psi		Each
Quick Clamp
316 Stainless Steel Body—EPDM Diaphragm and EPDMSeal
3/4"	0.984"	Side	200	3/4"	0.984"	Bottom	6 5/8"	3 9/32"	5 to 30, 35 to 90, 50 to 105	000000	000000000
1"	1.984"	Side	200	1"	1.984"	Bottom	6 11/16"	3 5/16"	5 to 30, 35 to 90, 50 to 105	000000	00000000
316 Stainless Steel Body—PTFE Plastic Diaphragm and EPDMSeal
2"	2.516"	Side	100	2"	2.516"	Bottom	11 5/8"	5 3/4"	10 to 25, 15 to 60	000000	00000000