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About Pressure-Relief Valves
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About Air Preparation
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About Backflow-Prevention Valves
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Corrosion-Resistant 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: -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.
Corrosion-Resistant Remote-Discharge ASME-Code
Fast-Acting Pressure-Relief Valves for Air and Inert Gas
- 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 (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 | 0000000 | |
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 | 000000 | |
| 1 | Bottom | 3,300 | 1 | Side | 90° Elbow | 9" | Pop Safety | 0000000 | 000000 | |
Made-to-Order Pressure-Relief Valves
Design a valve specifically for your process media and set pressure. Choose from a valve for air, inert gas, water, hydraulic oil, fuel oil, gasoline, or diesel fuel and a set pressure from 150 to 3,300 psi. These valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Body is 316 stainless steel for exceptional corrosion resistance.
To Order: Please specify medium and a set pressure from the range listed in the table.
Inlet | Relief Port | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Location | Maximum Pressure, psi | Pipe Size | Location | Temperature Range, °F | Overall Ht. | Set Pressure Range, psi | 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 | -10° to 400° | 7 1/2" | 150 to 3,300 | 0000000 | 0000000 | |
| 1/2 | Bottom | 3,300 | 3/4 | Side | -10° to 400° | 7 1/2" | 150 to 3,300 | 0000000 | 000000 | |
NPT Male Inlet and NPT Female Relief Port | ||||||||||
316 Stainless Steel Body—Fluoroelastomer Seal | ||||||||||
| 3/4 | Bottom | 3,300 | 3/4 | Side | -10° to 400° | 7 1/2" | 150 to 2,269 | 0000000 | 000000 | |
| 3/4 | Bottom | 3,300 | 3/4 | Side | -10° to 400° | 7 1/2" | 150 to 2,269 | 0000000 | 000000 | |
| 1 | Bottom | 3,300 | 1 | Side | -10° to 400° | 7 1/2" | 150 to 2,421 | 0000000 | 000000 | |
| 1 | Bottom | 3,300 | 1 | Side | -10° to 400° | 7 1/2" | 150 to 3,300 | 0000000 | 000000 | |
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.
Clean Room Pressure-Regulating Valves for Water, Air, and Inert Gas
- For Use With: Deionized Water, Air, Nitrogen, Oxygen
- Temperature Range: 41° to 140° F
To maintain contaminant-free standards in clean room environments, these valves come cleaned and bagged to Class 100 clean room standards and have a 316 stainless steel body with a smooth finish to resist dust collection. They automatically reduce a high, variable inlet pressure to a lower, stable output pressure. Adjust the outlet pressure within the range. Valves are no-bleed style, so they keep process media contained within the valve.
For technical drawings and 3-D models, click on a part number.
Inlet | Outlet | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Location | Max. Pressure, psi | Thread Size | Location | Pressure Range, psi | End-to-End Lg. | Environmental Rating | Each | |
Metric Female | |||||||||
316 Stainless Steel Body—Fluoroelastomer Diaphragm and 316 Stainless Steel Seal | |||||||||
| M5 × 0.8 mm | Side | 150 | M5 × 0.8 mm | Side | 1.4 to 28 | 1 3/16" | Fed. Std. Class 100, ISO Class 5 | 00000000 | 0000000 |
| M5 × 0.8 mm | Side | 150 | M5 × 0.8 mm | Side | 7 to 99 | 1 3/16" | Fed. Std. Class 100, ISO Class 5 | 00000000 | 000000 |
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" | 0000000 | 000000000 | |
Corrosion-Resistant Compact Pressure-Regulating Valves for Water
- For Use With: Deionized Water, Water
- Temperature Range: 33° to 120° F
Often used on dispensers, humidifiers, and fountains, these valves have a 316 stainless steel body that can stand up to deionized water and corrosive conditions. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. Valves have a low-profile body to fit in tight spots. All have a gauge port.
For technical drawings and 3-D models, click on a part number.
Quick-Set Pressure-Regulating Valves for Water
- For Use With: Water
- Temperature Range: See Table
- Specifications Met:
Threaded—NPT Female Bronze Body Valves: CSA Certified
All Other Valves: ASSE 1003 Listed, CAN/CSA-B356, CSA Certified, IAPMO Listed
Change outlet pressure without using a gauge—turn the dial to adjust the outlet pressure in 5 or 10 psi increments. These valves automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. They also have an internal strainer to trap debris. Union fittings on both ends of the valves disassemble for easy valve installation and removal. All of these valves meet Canadian safety standards for pressure-reducing valves. Some also meet American and international plumbing safety and performance standards.
Stainless steel valves resist corrosion better than bronze valves.
Corrosion-Resistant Panel-Mount Ultra-High-Pressure-Regulating
Valves for Water, Air, and Inert Gas
- For Use With: Water, Air, Inert Gas
- Temperature Range: 32° to 165° F
To regulate inlet pressures up to 6,000 psi in wet conditions and harsh environments, these valves have a 316 stainless steel body for exceptional corrosion resistance. They 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. They are no-bleed style, so they keep the process gases contained in the valve.
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. | Choose an Outlet Pressure Range, psi | Each | |
NPT Female | |||||||||||
316 Stainless Steel Body—PTFE Seal | |||||||||||
| 1/4 | Side | 6,000 | 1/4 | Side | 1/4 | Side | 2" | 1.37" | 0000000 | 0000000 | |
Cleaned and Bagged Panel-Mount Pressure-Regulating Valves for Air and Inert Gas
- For Use With: Air, Nitrogen, Argon, Helium
- Temperature Range: -40° to 160° F
Commonly used for oxygen service and other high-purity applications, these valves come cleaned and bagged to prevent contamination. All 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. They can also be surface mounted. All have two gauge ports. Body is 316 stainless steel for exceptional corrosion resistance. Valves are no-bleed style, so they keep process gases contained in the valve.
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 | Connection | End-to-End Lg. | Panel Cutout Dia. | Choose an Outlet Pressure Range, psi | Each | |
NPT Female | |||||||||||
316 Stainless Steel Body—316 Stainless Steel Diaphragm and PCTFE Seal | |||||||||||
| 1/4 | Side | 3,500 | 1/4 | Side | 1/4 | NPT Female | 2" | 1.42" | 0000000 | 0000000 | |
316 Stainless Steel Body—Nickel Alloy Diaphragm and PCTFE Seal | |||||||||||
| 1/2 | Side | 300 | 1/2 | Side | 1/4 | NPT Female | 2 1/2" | 1.56" | 0000000 | 000000 | |
Corrosion-Resistant Pressure-Regulating Valves for Steam
- For Use With: Steam
- Temperature Range: -40° to 450° F
Regulate steam pressure in wet environments and harsh conditions with these valves that have a 316 stainless steel body for exceptional 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—316 Stainless Steel Diaphragm and PTFE Seal | ||||||||
| 1/2 | Side | 400 | 1/2 | Side | 4 1/2" | 0000000 | 000000000 | |
| 3/4 | Side | 400 | 3/4 | Side | 5 1/8" | 0000000 | 00000000 | |
| 1 | Side | 400 | 1 | Side | 5 7/8" | 0000000 | 00000000 | |
Sanitary Pressure-Regulating Valves
- For Use With: Food and Beverage
- Temperature Range: -40° to 120°F
- Specifications Met: 3-A Certified 64-00, ANSI Class III, FDA Compliant 21 CFR 177.2600
Regulate air, gas, liquid, and steam 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 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, chemicals, and steam. 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 | |
Standard 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" | 0000000 | 000000000 | |
| 1" | 1.984" | Bottom | 200 | 1" | 1.984" | Side | T-Handle | 8 5/8" | 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" | 0000000 | 00000000 | |
| 2" | 2.516" | Bottom | 100 | 2" | 2.516" | Side | T-Handle | 16 1/8" | 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 Class III, FDA Compliant 21 CFR 177.2600
Designed to meet 3-A sanitary standards, these valves regulate liquid, gas, air, and steam 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 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 steam, 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 | |
Standard 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" | 000000 | 000000000 | |
| 1" | 1.984" | Side | 200 | 1" | 1.984" | Bottom | 6 11/16" | 3 5/16" | 000000 | 00000000 | |
316 Stainless Steel Body—PTFE Plastic Diaphragm and EPDMSeal | |||||||||||
| 1 1/2" | 1.984" | Side | 125 | 1 1/2" | 1.984" | Bottom | 7 11/16" | 4 3/16" | 000000 | 00000000 | |
| 2" | 2.516" | Side | 100 | 2" | 2.516" | Bottom | 11 5/8" | 5 3/4" | 000000 | 00000000 | |
Air-Release Valves for Oil and Fuel
- Max. Pressure: 400 psi
- Temperature Range: -20° to 500° F
Use this valve to eliminate air pockets in systems for oil, diesel fuel, gasoline, and kerosene. Valve has a vented relief port to exhaust discharge directly. Body is 304 stainless steel for excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Inlet | Relief Port | |||||
|---|---|---|---|---|---|---|
| Pipe Size | Location | Pipe Size | Location | Overall Ht. | Each | |
NPT Female Inlet and Relief Port | ||||||
304 Stainless Steel Body | ||||||
| 3/4 | Bottom | 1/2 | Top | 7" | 0000000 | 0000000 |
Pressure-Relief Hydraulic Valves
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 fully close when the system pressure is restored below the set pressure.
316 stainless steel valves are more corrosion resistant than iron valves.
For technical drawings and 3-D models, click on a part number.
Inlet Connection | Relief Connection | O'all | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Pipe Size | Dash Size | Lg. | Wd. | Ht. | Temp. Range, °F | Choose a Set Pressure Range, psi | Each | |
NPT Male Inlet and NPT Female Relief Port | ||||||||||
316 Stainless Steel Body | ||||||||||
| 1/2 | 08 | 1/2 | 08 | 1 5/8" | 1 1/8" | 4 3/16" | 40° to 250° | 0000000 | 0000000 | |
Easy-Adjust Pressure-Relief Hydraulic Valves
An external nut lets you adjust the pressure without disassembling the valve. These valves begin opening at the set pressure and fully open at about 10% over the set pressure. They begin closing as pressure drops and fully close when the system pressure is restored below the set pressure.
303 stainless steel valves are more corrosion resistant than brass valves.
For technical drawings and 3-D models, click on a part number.
High-Pressure Timer-Operated Compressed Air Drain Valves
These withstand at least double the pressure of our other timer-operated drain valves. Set the electronic timer to open automatically at your specified time interval. These drain valves are excellent for compressed air systems with high oil content because they resist clogging when water, oil, and sediment combine to form sludge. Install drain valves after separators, dryers, filters, and aftercoolers to collect and remove water from your air line.
Drain valves that meet NEMA 4X are rated for protection from dirt, washdowns, and corrosion.
For technical drawings and 3-D models, click on a part number.
Inlet | Outlet | Overall | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Thread Type | Gender | Pipe Size | Thread Type | Gender | Discharge Cap., gpm | Max. Pressure, psi | Ht. | Wd. | Dp. | Cycle Interval | Drain Time | Max. Temp., °F | Each | |
316 Stainless Steel Housing—NEMA 4X Enclosure | |||||||||||||||
Electric Powered, 120V AC—Three-Prong Plug | |||||||||||||||
| 1/2 | NPT | Female | 1/2 | NPT | Female | 1.25 | 2,000 | 7" | 7 5/8" | 4" | 1-50 min. | 5 sec. | 180° | 00000000 | 0000000 |
| 3/4 | NPT | Female | 3/4 | NPT | Female | 2.5 | 600 | 7 1/2" | 7 5/8" | 4" | 1-50 min. | 5 sec. | 180° | 00000000 | 000000 |
| 1 | NPT | Female | 1 | NPT | Female | 4.3 | 600 | 7 3/4" | 7 5/8" | 4" | 1-50 min. | 5 sec. | 180° | 00000000 | 000000 |
| Replacement Filter Screens for Optional Strainers | 0000000 | Each | 00000 |
Vacuum-Breaking Valves
Also known as vacuum breakers, these valves have vents that open when pressure drops to relieve vacuum conditions and prevent backward suction from drawing liquid into upstream piping.
303 stainless steel valves have the best corrosion resistance.
Straights are often used with steam coils, heat exchangers, and space heaters.
NPT Female
Outlet Straight
Unthreaded
Female Outlet
- For Use With: Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon
- Seal Material: EPR Rubber
303 Stainless Steel Body | |||||||
|---|---|---|---|---|---|---|---|
| Inlet Pipe Size | Outlet Pipe Size | For Outlet Tube OD | Max. Pressure | Temperature Range, °F | End-to-End Lg. | Each | |
NPT Male Inlet × NPT Female Outlet | |||||||
| 1/2 | 3/8 | __ | 300 psi @ 70° F | -20° to 365° | 1 3/4" | 0000000 | 0000000 |
| 3/4 | 1/2 | __ | 300 psi @ 70° F | -20° to 365° | 2 1/8" | 0000000 | 000000 |
| 1 | 3/4 | __ | 300 psi @ 70° F | -20° to 365° | 2 3/8" | 0000000 | 000000 |
NPT Male Inlet × Unthreaded Female Outlet | |||||||
| 1/2 | __ | 11/16" | 300 psi @ 70° F | -20° to 365° | 1 3/4" | 0000000 | 000000 |
| 3/4 | __ | 13/16" | 300 psi @ 70° F | -20° to 365° | 2 1/8" | 0000000 | 000000 |
| 1 | __ | 1 1/16" | 300 psi @ 70° F | -20° to 365° | 2 3/8" | 0000000 | 000000 |
High-Pressure Vacuum-Breaking Valves
- For Use With: Air, Argon, Helium, Krypton, Neon, Oil, Water, Xenon
- Seal Material: Fluoroelastomer Rubber
Rated for 12 times the pressure of standard vacuum-breaking valves, these can handle up to 1,500 psi. Also known as vacuum breakers, they have vents that open when pressure drops to relieve vacuum conditions and prevent backward suction from drawing liquid into upstream piping. Body is 316 stainless steel for excellent corrosion resistance.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
For technical drawings and 3-D models, click on a part number.