About Pressure-Relief Valves
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ASME-Code Fast-Acting Pressure-Relief Valves for Air and Inert Gas
![](/prerenderstable/mvPRE/contents/gfx/imagecache/988/9889k505p1-c03a-digital@halfx_636856111440751876.png?ver=imagenotfound)
With
Test Ring
![](/prerenderstable/mvPRE/contents/gfx/imagecache/470/4701k22p1-c03a-digital@halfx_636856092115141313.png?ver=imagenotfound)
- For Use With: Air, Inert Gas
- Temperature Range: See table
To protect against damage in air lines, air receivers, compressor tanks, and other air-powered equipment, these valves spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. All meet ASME Code Section VIII for use with air and inert gas pressure vessels. They have a vented relief port to exhaust discharge directly.
Valves with a nickel-plated brass body are more corrosion resistant than valves with a plain brass body.
Silicone seals provide better leak protection than brass seals.
For technical drawings and 3-D models, click on a part number.
Inlet | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Location | Relief Port Location | Temperature Range, ° F | Overall Ht. | Test Mechanism | Valve Type | Specifications Met | Choose a Set Pressure, psi | Each | |
NPT Male Inlet and Relief Vent | ||||||||||
Nickel-Plated Brass Body—Silicone Seal | ||||||||||
1/8 | Bottom | Side | -15° to 250° | 2" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 000000 | |
1/4 | Bottom | Side | -15° to 250° | 2" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
3/8 | Bottom | Side | -15° to 250° | 2" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
Brass Body—Brass Seal | ||||||||||
1/8 | Bottom | Side | -40° to 400° | 2 1/8" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
1/4 | Bottom | Side | -40° to 400° | 3 1/8" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
1/4 | Bottom | Side | -40° to 400° | 3 3/16" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
1/4 | Bottom | Side | -20° to 300° | 3 3/16" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 000000 | |
1/4 | Bottom | Top | -40° to 400° | 3 1/8" | Lever | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
3/8 | Bottom | Side | -40° to 400° | 3 1/8" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
3/8 | Bottom | Side | -40° to 400° | 3 9/16" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
3/8 | Bottom | Top | -40° to 400° | 3 1/8" | Lever | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
1/2 | Bottom | Side | -40° to 400° | 3 3/4" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
1/2 | Bottom | Side | -40° to 400° | 3 13/16" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
1/2 | Bottom | Top | -40° to 400° | 3 1/8" | Lever | Pop Safety | ASME BPVC.VIII | 0000000 | 00000 | |
3/4 | Bottom | Side | -40° to 400° | 5 7/16" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 000000 | |
1 | Bottom | Side | -40° to 400° | 5 3/4" | Ring | Pop Safety | ASME BPVC.VIII | 0000000 | 000000 | |
Brass Body—Silicone Seal | ||||||||||
1/8 | Bottom | Side | -15° to 250° | 2" | Ring | Pop Safety | ASME BPVC.VIII | 00000000 | 0000 | |
1/4 | Bottom | Side | -15° to 250° | 2" | Ring | Pop Safety | ASME BPVC.VIII | 00000000 | 0000 | |
3/8 | Bottom | Side | -15° to 250° | 2" | Ring | Pop Safety | ASME BPVC.VIII | 00000000 | 0000 | |
1/2 | Bottom | Side | -15° to 250° | 3 3/8" | Ring | Pop Safety | ASME BPVC.VIII | 00000000 | 00000 | |
1/2 | Bottom | Side | -15° to 250° | 3 13/16" | Ring | Pop Safety | ASME BPVC.VIII | 00000000 | 00000 | |
3/4 | Bottom | Side | -15° to 250° | 3 13/16" | Ring | Pop Safety | ASME BPVC.VIII | 00000000 | 00000 | |
1 | Bottom | Side | -15° to 250° | 4 7/8" | Ring | Pop Safety | ASME BPVC.VIII | 00000000 | 00000 | |
1 1/4 | Bottom | Side | -15° to 250° | 4 7/8" | Ring | Pop Safety | ASME BPVC.VIII | 00000000 | 000000 |
Fast-Acting Pressure-Relief Valves for Air and Inert Gas
![](/prerenderstable/mvPRE/contents/gfx/imagecache/477/4772k801p1-c03a-digital@halfx_636856103040755136.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/470/4701k82p1-c03a-digital@halfx_637091681440035615.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/902/9024k313p1-c03a-digital@halfx_637091663021986308.png?ver=imagenotfound)
With
Test Ring
- For Use With: Air, Inert Gas
- Temperature Range: -30° to 400° F
These valves spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. They have a vented relief port to exhaust discharge directly.
For technical drawings and 3-D models, click on a part number.
Inlet | |||||||||
---|---|---|---|---|---|---|---|---|---|
Pipe Size | Location | Maximum Pressure, psi | Relief Port Location | Overall Ht. | Test Mechanism | Valve Type | Choose a Set Pressure, psi | Each | |
NPT Male Inlet and Relief Vent | |||||||||
Brass Body and Seal | |||||||||
1/8 | Bottom | 100 | Side | 1 3/4" | __ | Pop Safety | 000000 | 000000 | |
1/4 | Bottom | 200 | Top | 3 1/8" | Lever | Pop Safety | 0000000 | 00000 | |
1/4 | Bottom | 300 | Side | 2 1/2" | __ | Pop Safety | 000000 | 00000 | |
1/4 | Bottom | 300 | Side | 3 1/8" | Ring | Pop Safety | 0000000 | 00000 | |
3/8 | Bottom | 200 | Top | 3 1/8" | Lever | Pop Safety | 0000000 | 00000 | |
3/8 | Bottom | 300 | Side | 2 1/2" | __ | Pop Safety | 000000 | 00000 | |
3/8 | Bottom | 300 | Side | 3 1/8" | Ring | Pop Safety | 0000000 | 00000 | |
1/2 | Bottom | 200 | Top | 3 1/8" | Lever | Pop Safety | 0000000 | 00000 | |
1/2 | Bottom | 300 | Side | 2 5/8" | __ | Pop Safety | 000000 | 00000 | |
1/2 | Bottom | 300 | Side | 3 3/4" | Ring | Pop Safety | 0000000 | 00000 | |
3/4 | Bottom | 300 | Side | 5 7/16" | Ring | Pop Safety | 0000000 | 000000 | |
1 | Bottom | 300 | Side | 5 3/4" | Ring | Pop Safety | 0000000 | 000000 |
Corrosion-Resistant ASME-Code Fast-Acting
Pressure-Relief Valves for Air and Inert Gas
![](/prerenderstable/mvPRE/contents/gfx/imagecache/989/98905k182-@halfx_637091660119790579.png?ver=imagenotfound)
- For Use With: Air, Inert Gas
- Specifications Met: ASME BPVC.VIII
- Temperature Range: -40° to 400° F
For corrosion resistance in wet conditions and harsh environments, these valves have a 303 stainless steel body. They spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. All meet ASME Code Section VIII for use with air and inert gas pressure vessels. Valves have a vented relief port to exhaust discharge directly.
For technical drawings and 3-D models, click on a part number.
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: See table
Unlike valves that release discharge directly, these have a threaded relief port to direct discharge away from your work environment. They spring fully open at the set pressure and remain fully open until the system pressure is restored below the set pressure. All meet ASME Code Section VIII for use with air and inert gas pressure vessels. Body is bronze for durability and a long service life.
For technical drawings and 3-D models, click on a part number.
Corrosion-Resistant Remote-Discharge ASME-Code
Fast-Acting Pressure-Relief Valves for Air and Inert Gas
![](/prerenderstable/mvPRE/contents/gfx/imagecache/687/6872k31p1-c03a-digitall1581710718@halfx_637196059370811898.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/687/6872k322@halfx_637196059675454365.png?ver=imagenotfound)
- Specifications Met: ASME BPVC.VIII
- Temperature Range: -10° to 400° F
With a 316 stainless steel body for exceptional corrosion resistance, these valves are often used in wet conditions and harsh environments. They spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. All meet ASME Code Section VIII for use with air and inert gas pressure vessels. Attach a drain line to the threaded relief port for remote discharge.
To Order: Please specify medium (air or inert gas) and set pressure in 1 psi increments (from 150 to 2,700 psi for valves with 1/2 or 1 inlet pipe size, or 150 to 2,269 psi for valves with 3/4 inlet pipe size).
Inlet | Relief Port | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Location | Maximum Pressure, psi | Pipe Size | Location | Shape | Overall Ht. | Valve Type | Choose a Medium | Each | |
NPT Female Inlet and NPT Female Relief Port | ||||||||||
316 Stainless Steel Body—Fluoroelastomer Seal | ||||||||||
1/2 | Bottom | 3,300 | 3/4 | Side | 90° Elbow | 9" | Pop Safety | 0000000 | 000000000 | |
NPT Male Inlet and NPT Female Relief Port | ||||||||||
316 Stainless Steel Body—Fluoroelastomer Seal | ||||||||||
3/4 | Bottom | 3,300 | 3/4 | Side | 90° Elbow | 9" | Pop Safety | 0000000 | 00000000 | |
1 | Bottom | 3,300 | 1 | Side | 90° Elbow | 9" | Pop Safety | 0000000 | 00000000 |
Adjustable Fast-Acting Pressure-Relief Valves for Air and Inert Gas
![](/prerenderstable/mvPRE/contents/gfx/imagecache/502/50265k23p2-c03a-digital@halfx_636856086445703073.png?ver=imagenotfound)
- For Use With: Air, Inert Gas
- Temperature Range: -15° to 250° F
Change set pressure to suit your application—this valve includes four interchangeable color-coded springs with different set pressure ranges. Remove the adjustment screw to change springs; turn the screw to alter the set pressure within the range. The valve springs fully open at the set pressure and remains open until the system pressure is restored below the set pressure. It has a vented relief port to exhaust discharge directly.
For technical drawings and 3-D models, click on a part number.
Inlet | Set Pressure | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Location | Maximum Pressure, psi | Relief Port Location | Range, psi | Adjustment Method | Overall Ht. | Valve Type | Includes | Each | |
NPT Male Inlet and Relief Vent | ||||||||||
Brass Body—Silicone Seal | ||||||||||
1/4 | Bottom | 200 | Side | 25 to 200 | External Adjustment Screw | 1 5/8" | Pop Safety | Yellow Spring (25-50 psi), Red Spring (51-100 psi), Silver Spring (101-150 psi), Blue Spring (151-200 psi) | 00000000 | 00000 |
ASME-Code Fast-Acting Pressure-Relief Valves for Low-Pressure Steam
- For Use With: Steam
- Specifications Met: ASME BPVC.IV
- Max. Temperature: 250° F
For use with low-pressure steam-heating boilers requiring pressure relief at 15 psi, these valves meet ASME Code Section IV. All spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. Body is bronze for durability and a long service life.
Vented relief ports exhaust discharge directly.
Threaded relief ports can be attached to a drain line for remote discharge.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/469/4699k29p1-c03a-digital@halfx_636856140220440258.png?ver=imagenotfound)
Inlet | Relief Port | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Connection | Location | Maximum Pressure, psi | Connection Type | Location | Steam Flow Capacity, lbs./hr. | Set Pressure, psi | Overall Ht. | Test Mechanism | Valve Type | Each | |
Bronze Body—EPDM Seal | ||||||||||||
3/4 | NPT Male | Bottom | 15 | Vent | Top | 410 | 15 | 2 7/8" | Lever | Pop Safety | 0000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/469/4699k46p1-c03a-digital@halfx_636856154788523192.png?ver=imagenotfound)
Inlet | Relief Port | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Connection | Location | Maximum Pressure, psi | Pipe Size | Connection | Location | Steam Flow Capacity, lbs./hr. | Set Pressure, psi | Overall Ht. | Test Mechanism | Valve Type | Each | |
Bronze Body—PTFE-Coated EPDM Seal | |||||||||||||
3/4 | NPT Male | Bottom | 15 | 3/4 | NPT Female | Side | 470 | 15 | 3 13/16" | Lever | Pop Safety | 0000000 | 000000 |
1 | NPT Male | Bottom | 15 | 1 | NPT Female | Side | 640 | 15 | 4" | Lever | Pop Safety | 0000000 | 00000 |
1 1/4 | NPT Male | Bottom | 15 | 1 1/2 | NPT Female | Side | 1,200 | 15 | 4 1/2" | Lever | Pop Safety | 0000000 | 000000 |
1 1/2 | NPT Male | Bottom | 15 | 2 | NPT Female | Side | 1,900 | 15 | 5 1/4" | Lever | Pop Safety | 0000000 | 000000 |
2 | NPT Male | Bottom | 15 | 2 | NPT Female | Side | 2,500 | 15 | 6 9/16" | Lever | Pop Safety | 000000 | 000000 |
2 1/2 | NPT Male | Bottom | 15 | 2 1/2 | NPT Female | Side | 3,520 | 15 | 8 1/8" | Lever | Pop Safety | 000000 | 000000 |
3 | NPT Male | Bottom | 15 | 3 | NPT Female | Side | 4,100 | 15 | 9 1/16" | Lever | Pop Safety | 000000 | 000000 |
Fast-Acting Pressure-Relief Valves for Ultra-Low-Pressure Steam
- For Use With: Steam
- Max. Temperature: 250° F
Choose these valves for small steam-heating boilers requiring pressure relief between 5 psi and 12 psi. They spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. All have a bronze body for durability and a long service life.
Vented relief ports exhaust discharge directly.
Threaded relief ports can be attached to a drain line for remote discharge.
For technical drawings and 3-D models, click on a part number.
Fast-Acting Pressure-Relief Valves for Cryogenic Liquids
![](/prerenderstable/mvPRE/contents/gfx/imagecache/913/9137k41p1-c03a-digital@halfx_636855934882209981.png?ver=imagenotfound)
- For Use With: Liquid Argon, Liquid Nitrogen, Liquid Oxygen
- Temperature Range: -320° to 350° F
Cleaned and bagged for oxygen service and other high-purity applications, these valves can withstand the extreme cold of liquid argon, liquid nitrogen, and liquid oxygen. They spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. All have a vented relief port to exhaust discharge directly.
For technical drawings and 3-D models, click on a part number.
ASME-Code Fast-Acting Pressure-Relief Valves for Cryogenic Fluids
![](/prerenderstable/mvPRE/contents/gfx/imagecache/808/8089k141p1-c03a-digital@halfx_636855950504471191.png?ver=imagenotfound)
- For Use With: Argon, Carbon Dioxide, Helium, Hydrogen, Methane, Nitrogen, Oxygen
- Specifications Met: ASME BPVC.VIII
- Temperature Range: -320° to 150° F
These valves meet ASME Code Section VIII for use with cryogenic pressure vessels. Rated for use with argon, carbon dioxide, helium, hydrogen, methane, nitrogen, and oxygen, they are cleaned and bagged for oxygen service and other high-purity applications. All 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.
For technical drawings and 3-D models, click on a part number.
ASME-Code Fast-Acting Pressure-Relief Valves for Water
![](/prerenderstable/mvPRE/contents/gfx/imagecache/627/6270t111p1-c03a-digital@halfx_636855920611929328.png?ver=imagenotfound)
- For Use With: Water
- Temperature Range: -60° to 406° F
These valves meet ASME Code Section VIII for use with water pressure vessels. They spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. All have a threaded relief port that can be attached to a drain line for remote discharge. Body is bronze for durability and a long service life.
For technical drawings and 3-D models, click on a part number.
Inlet | Relief Port | ||||||||
---|---|---|---|---|---|---|---|---|---|
Pipe Size | Location | Pipe Size | Location | Overall Ht. | Valve Type | Specifications Met | Choose a Set Pressure, psi | Each | |
NPT Male Inlet and NPT Female Relief Port | |||||||||
Bronze Body—316 Stainless Steel Seal | |||||||||
1/2 | Bottom | 3/4 | Side | 7 1/2" | Pop Safety | ASME BPVC.VIII | 0000000 | 0000000 | |
3/4 | Bottom | 3/4 | Side | 7 1/2" | Pop Safety | ASME BPVC.VIII | 0000000 | 000000 | |
1 | Bottom | 1 1/4 | Side | 9" | Pop Safety | ASME BPVC.VIII | 0000000 | 000000 | |
1 1/2 | Bottom | 2 | Side | 13 1/4" | Pop Safety | ASME BPVC.VIII | 0000000 | 000000 |