About Pressure-Relief Valves
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About Air Preparation
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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.
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 1/2 | Side | 200 | 1 1/2 | Side | 32° to 180° F | 6 3/4" | 0000000 | 0000000 |
Heavy Duty Pressure-Regulating Valves for Water and Air

- For Use With: Water, Air
- Temperature Range: 32° to 180° F
Thicker walls and a 304 stainless steel seal make these valves tougher than brass pressure-regulating valves. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. Valves have an internal strainer to trap debris. Body is bronze for durability and a long service life.
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:
Bronze Body Valves: CSA Certified
Stainless Steel Body 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.
Bronze valves are durable and have a long service life. Their gauge ports let you attach a pressure gauge to measure the pressure flowing in and out of 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 | Pressure Range, psi | Pipe Size | Location | Temp. Range, °F | End-to-End Lg. | Each | |
Bronze Body—EPDM Diaphragm and EPDM Seal | |||||||||||
1 1/2 | Side | 250 | 1 1/2 | Side | 25 to 90 | 1/4 | Side | 33° to 140° | 7 7/8" | 00000000 | 0000000 |
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.
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 1/2 | Side | 250 | 1 1/2 | Side | 6 1/2" | 0000000 | 0000000 | 0000000 | 0000000 | |
Cast Iron Body—Bronze Diaphragm and PTFE Seal with Internal Strainer | ||||||||||
1 1/2 | Side | 150 | 1 1/2 | Side | 6 3/4" | 0000000 | 000000 | 0000000 | 000000 |
Extended-Life Pressure-Regulating Valves for Steam

- For Use With: Steam
- Temperature Range: -20° to 400° F
For a longer service life than cast iron valves, these have a durable bronze body. All automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. Valves have an internal strainer to trap debris.
For technical drawings and 3-D models, click on a part number.
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.
Pressure-Regulating Valves for Drinking Water

- 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 and Union Fitting | |||||||||
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 | 0000000 |
Pressure-Regulating Valves for Chemicals

- For Use With: Chemicals
- Temperature Range:
Polypropylene Body: 35° to 180° F
PVC Body: 40° to 140° F
A plastic body and fluoroelastomer seal stand up to harsh chemicals. These valves 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 | Pressure Range, psi | End-to-End Lg. | Each | |
NPT Female | ||||||||
PVC Body—Fluoroelastomer Seal | ||||||||
1 1/2 | Side | 125 | 1 1/2 | Side | 10 to 80 | 6 1/8" | 00000000 | 000000000 |
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 1/2 | Side | 400 | 1 1/2 | Side | 1 1/2 | Bottom | 5" | 0000000 | 000000000 |
Extended-Life Vacuum-Regulating Valves for Air and Inert Gas

- For Use With: Air, Inert Gas
- Temperature Range: -20° to 180° F
For a longer service life than brass vacuum-regulating valves, these are made of bronze for strength and durability. They throttle a high vacuum source to maintain a lower vacuum level in your system. Adjust the outlet vacuum level within the range.
For technical drawings and 3-D models, click on a part number.
Inlet | Outlet | |||||||
---|---|---|---|---|---|---|---|---|
Pipe Size | Location | Pipe Size | Location | Vacuum Range, in. of Hg | Vacuum Adjustment Method | End-to-End Lg. | Each | |
NPT Female | ||||||||
Bronze Body—Neoprene Diaphragm and Chrome-Plated Bronze Seal | ||||||||
1 1/2 | Side | 1 1/2 | Side | 8 to 30 | Screw | 5 3/4" | 0000000 | 000000000 |
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.
Fluoroelastomer seals provide better leak protection than brass or 316 stainless steel seals.
For technical drawings and 3-D models, click on a part number.
Material | ||||||||
---|---|---|---|---|---|---|---|---|
Seal | Body | Temperature Range, °F | Test Mechanism | Overall Ht. | Valve Type | Choose a Set Pressure, psi | Each | |
Brass | Bronze | -60° to 406° | Lever | 10 5/8" | Pop Safety | 0000000 | 0000000 | |
Brass | Bronze | -15° to 406° | __ | 9 7/16" | Pop Safety | 0000000 | 000000 | |
Brass | Bronze | -15° to 406° | Lever | 9 3/4" | Pop Safety | 0000000 | 000000 | |
Fluoroelastomer | Bronze | -15° to 406° | Lever | 10 5/8" | Pop Safety | 0000000 | 000000 |
ASME-Code Fast-Acting Pressure-Relief Valves for Water

- 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 1/2 | Bottom | 2 | Side | 13 1/4" | Pop Safety | ASME BPVC.VIII | 0000000 | 0000000 |
ASME-Code Fast-Acting Pressure-Relief Valves for Steam


- For Use With: Steam
- Temperature Range: -60° to 400° F
These valves meet ASME Code Section I for use with steam power boilers requiring pressure relief above 15 psi. They spring fully open at the set pressure and remain open until the system pressure is restored below the set pressure. For remote discharge, attach a drain line to the threaded relief port. Valves have a durable bronze body for a long service life.
Swivel test levers rotate 360° around the valve for use in areas with limited clearance.
For technical drawings and 3-D models, click on a part number.
Inlet | Relief Port | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Location | Maximum Pressure, psi | Pipe Size | Location | Overall Ht. | Test Mechanism | Test Lever Type | Valve Type | Specifications Met | Choose a Set Pressure, psi | Each | |
NPT Male Inlet and NPT Female Relief Port | ||||||||||||
Bronze Body—Brass Seal | ||||||||||||
1 1/2 | Bottom | 250 | 1 1/2 | Side | 9 5/8" | Lever | Swivel | Pop Safety | ASME BPVC.I | 0000000 | 0000000 | |
1 1/2 | Bottom | 250 | 2 | Side | 10 5/8" | Lever | __ | Pop Safety | ASME BPVC.I | 0000000 | 000000 |
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.
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.

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 | |||||||||||||
1 1/2 | NPT Male | Bottom | 15 | 2 | NPT Female | Side | 1,900 | 15 | 5 1/4" | Lever | Pop Safety | 0000000 | 0000000 |
ASME-Code Fast-Acting Pressure-Relief Valves for Hot Water

- For Use With: Water
- Specifications Met: ASME BPVC.IV
- Temperature Range: 33° to 250° F
Protect your water-heating system with these valves that meet ASME Code Section IV for hot water heaters and boilers. 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. Valves have a durable bronze body for a long service life.
For technical drawings and 3-D models, click on a part number.
Adjustable Pressure-Relief Valves for Fuel

- For Use With: Diesel Fuel, Fuel Oil, Gasoline, Kerosene
- Temperature Range: -20° to 400° F
To gradually relieve pressure in lines for diesel fuel, fuel oil, gasoline, and kerosene, 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 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 Female Inlet and Relief Port | |||||||||
Brass Body—416 Stainless Steel Seal | |||||||||
1 1/2 | Bottom | 1,000 | 1 1/2 | Side | External Adjustment Screw | 11 1/16" | 0000000 | 0000000 |
Precision-Adjustment Pressure-Relief Valves for Fuel

- For Use With: Diesel Fuel, Fuel Oil, Gasoline, Kerosene
- Temperature Range: -60° to 450° F
A finely threaded adjustment screw lets you make precise set pressure adjustments. These valves are for use with diesel fuel, fuel oil, gasoline, and kerosene. 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.
Valves with a bronze body are harder and more durable than valves with a brass body for a longer service life.
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 and Seal | |||||||||
1 1/2 | Bottom | 400 | 1 1/2 | Side | External Adjustment Screw | 9 1/2" | 0000000 | 0000000 |
Adjustable Pressure-Relief Valves for Chemicals

- For Use With: Aluminum Chloride, Boric Acid
- Temperature Range: 40° to 140° F
Often used with catalysts, pH buffers, and electroplating solutions, these valves have a PVC body and an EPDM seal for excellent chemical resistance. 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. Valves have a port for attaching a pressure gauge.
For technical drawings and 3-D models, click on a part number.
Inlet | Relief Port | Set Pressure | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Location | Maximum Pressure, psi | Pipe Size | Location | Range, psi | Adjustment Method | Overall Ht. | Gauge Port Pipe Size | Each | |
NPT Female Inlet and Relief Port | ||||||||||
Dark Gray PVC Body—EPDM Seal | ||||||||||
1 1/2 | Bottom | 150 | 1 1/2 | Side | 5 to 75 | External Adjustment Screw | 13 1/4" | 1/4 | 0000000 | 000000000 |
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 1/2 | Bottom | 1,400 | 1 1/2 | Side | External Adjustment Screw | 8 7/8" | 0000000 | 000000000 |
Compressed Air Regulators
Adjust and maintain the pressure of your compressed air. Install regulators in your air line after filters.
Relieving regulators exhaust when the downstream pressure exceeds the set pressure.
Mounting brackets allow you to attach the regulator to a wall or equipment.
For technical drawings and 3-D models, click on a part number.

Safety-Lockout Air On/Off Valves

Padlocks that comply with OSHA 29 CFR 1910.147 meet standards for the control of energy sources that could injure workers.
For technical drawings and 3-D models, click on a part number.
Flow Rate @ 100 psi | Overall | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Inlet Pipe Size | Outlet Pipe Size | Exhaust Pipe Size | Flow Coefficient (Cv) | Min. | Max. | Max. Pressure, psi | Temp. Range, °F | Lg. | Wd. | Ht. | For Max. Padlock Shackle Dia. | Specifications Met | Each | |
Brass Body | ||||||||||||||
1 1/2 | 1 1/2 | 1/4 | 140 | Not Rated | Not Rated | 200 | 32° to 210° | 8 3/16" | 2 13/16" | 5 1/4" | 9/32" | OSHA Compliant 29 CFR 1910.147 | 0000000 | 000000 |
Metering Valves for Abrasive Blasting
Control the amount of abrasive material that your blast hose releases by using these valves, which have a knob for adjusting the size of their opening. To help you find the right size quickly, there’s a virtual position indicator under the knob. Their stainless steel body resists wear and won’t rust in damp locations. Abrasive material passes through the valve’s base, so for extreme durability the base is made of steel and the seat and gasket are polyurethane. When it’s time to remove debris from these valves, you don’t have to take them apart because they have a cleanout port. To eliminate air leaks, their bolt holes are sealed.
For technical drawings and 3-D models, click on a part number.




- Valve Type: Needle
- For Use With: Aluminum Oxide Grit, Black Beauty Grit, Garnet Grit, Glass Bead, Glass/Aluminum Oxide Grit, Ground Glass, Silicon Carbide Grit, Stainless Steel Shot, Steel Grit, Steel Shot
- Seat Material: Polyurethane Rubber
- Gasket Material: Polyurethane Rubber
Valves | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Air Inlet | Abrasive Blasting Media Inlet | Outlet | Replacement Knobs | Replacement Plungers | Replacement Valve Bases | |||||||||||||
Pipe Size | Gender | Thread Type | Pipe Size | Gender | Thread Type | Pipe Size | Gender | Thread Type | Maximum Pressure, psi | Temperature Range, °F | Each | Each | Each | Each | ||||
Stainless Steel Body with Black-Oxide Steel Base | ||||||||||||||||||
1 1/2 | Male | NPT | 1 1/4 | Male | NPT | 1 1/4 | Male | NPT | 150 | -20° to 250° | 0000000 | 0000000 | 0000000 | 000000 | 0000000 | 0000000 | 0000000 | 0000000 |

Gasket Material | Number of Gaskets Included | Each | |
Polyurethane Rubber | 4 | 0000000 | 000000 |

Pipe Size | Gender | Thread Type | Each | |
1 1/4 | Male | NPT | 0000000 | 000000 |

Includes | Each | |
Base Gasket Plunger Gasket Seat | 0000000 | 0000000 |

Includes | Each | |
Base Gasket Plunger Plunger Gasket Plunger Screw Seat | 0000000 | 0000000 |