About Pressure-Relief Valves
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About Backflow-Prevention Valves
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High-Accuracy Panel-Mount Vacuum-Regulating Valves for Air and Inert Gas
- For Use With: Air, Argon, Nitrogen
- Temperature Range: -40° to 165° F
For precise control over your vacuum level, these valves have ±0.1% accuracy. They throttle a high vacuum source to maintain a lower vacuum level in your system. Adjust the outlet vacuum level within the range. Valves have threads below the adjustment knob and come with a panel-mount nut. All have a gauge port. They are constant-bleed style, so they continually release small amounts of process gas to improve accuracy and repeatability.
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. Turning the adjustment screw will adjust the vacuum setting.
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 | ||||||||
| 1/2 | Side | 1/2 | Side | 2 to 30 | Screw | 2 7/8" | 0000000 | 0000000 |
| 3/4 | Side | 3/4 | Side | 2 to 30 | Screw | 2 7/8" | 0000000 | 000000 |
| 1 | Side | 1 | Side | 2 to 30 | Screw | 4 1/2" | 0000000 | 00000000 |
| 1 1/4 | Side | 1 1/4 | Side | 2 to 30 | Screw | 4 1/2" | 0000000 | 00000000 |
| 1 1/2 | Side | 1 1/2 | Side | 8 to 30 | Screw | 5 3/4" | 0000000 | 00000000 |
| 2 | Side | 2 | Side | 8 to 30 | Screw | 5 3/4" | 0000000 | 00000000 |
Vacuum-Regulating Valves for Air and Inert Gas
- For Use With: Air, Carbon Dioxide, Inert Gas, Nitrogen
- Temperature Range: -20° to 180° F
Throttle a high vacuum source to maintain a lower vacuum level in your system. Adjust the outlet vacuum level within the range. All valves have a gauge port.
Adjustable Vacuum-Relief Valves for Air and Inert Gas
- For Use With: Air, Inert Gas
- Temperature Range: -15° to 250° F
These valves begin opening at the set vacuum level and fully open at about 10% over the set point. They begin closing as the vacuum level drops and fully close when the system is restored below the set point. Adjust the set vacuum level within the range. Valves have a vented relief port to exhaust discharge directly.
Inlet | Set Vacuum | ||||||
|---|---|---|---|---|---|---|---|
| Pipe Size | Location | Relief Port Location | Range , in. of Hg | Adjustment Method | Overall Ht. | Each | |
NPT Male Inlet and Relief Vent | |||||||
Brass Body—440C Stainless Steel Seal | |||||||
| 1/4 | Bottom | Top | 0 to 27 | External Adjustment Screw | 1 3/4" | 00000000 | 00000 |
Brass Body—Buna-N Seal | |||||||
| 3/8 | Bottom | Top | 0 to 27 | External Adjustment Screw | 2 1/16" | 00000000 | 00000 |
| 3/4 | Bottom | Top | 0 to 27 | External Adjustment Screw | 2 5/8" | 00000000 | 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.
Chrome-plated bronze valves are more corrosion resistant than brass valves.
Elbows are designed for intermittent flow. They discharge liquid directly and should not be installed in areas where spillage could cause damage.
Straights are often used with steam coils, heat exchangers, and space heaters.
- For Use With: Water
- Seal Material: Silicone Rubber
Brass Body | Chrome-Plated Bronze Body | ||||||
|---|---|---|---|---|---|---|---|
| Pipe Size | Max. Pressure | Temperature Range, °F | Port-to-Port Lg. | Each | Each | ||
NPT Female Inlet × NPT Female Outlet | |||||||
| 1/4 | 125 psi @ 70° F | 35° to 180° | 1" | 000000 | 00 | 0000000 | 000000 |
| 3/8 | 125 psi @ 70° F | 35° to 180° | 1" | 000000 | 00 | 0000000 | 00000 |
| 1/2 | 125 psi @ 70° F | 35° to 180° | 1 1/4" | 000000 | 00 | 0000000 | 00000 |
| 1/2 | 125 psi @ 70° F | 35° to 180° | 1 5/16" | 00000000 | 000000 | 000000 | 00 |
| 3/4 | 125 psi @ 70° F | 35° to 180° | 1 1/2" | 00000000 | 00000 | 0000000 | 00000 |
| 1 | 125 psi @ 70° F | 35° to 180° | 1 5/8" | 00000000 | 00000 | 000000 | 00 |
| 1 1/4 | 125 psi @ 70° F | 35° to 180° | 2" | 00000000 | 000000 | 000000 | 00 |
| 1 1/2 | 125 psi @ 70° F | 35° to 180° | 2 1/4" | 00000000 | 000000 | 000000 | 00 |
| 2 | 125 psi @ 70° F | 35° to 180° | 2 3/4" | 00000000 | 000000 | 000000 | 00 |
- For Use With: Air, Argon, Helium, Krypton, Neon, Steam, Water, Xenon
- Seal Material: EPR Rubber
Brass Body | |||||||
|---|---|---|---|---|---|---|---|
| Inlet Pipe Size | Outlet Pipe Size | Max. Pressure | Temperature Range, °F | End-to-End Lg. | Body Material | Each | |
NPT Male Inlet × NPT Female Outlet | |||||||
| 1/2 | 3/8 | 300 psi @ 70° F | -20° to 365° | 1 3/4" | Brass | 0000000 | 0000000 |
| 3/4 | 1/2 | 300 psi @ 70° F | -20° to 365° | 2 1/8" | Brass | 0000000 | 000000 |
| 1 | 3/4 | 300 psi @ 70° F | -20° to 365° | 2 3/8" | Brass | 0000000 | 000000 |
Vacuum-Breaking Valves with Garden-Hose Fittings
- For Use With: Air, Water
- Seal Material: Rubber
Prevent dirty, contaminated water from backing up into your garden hose line—install these valves between a faucet and a garden hose. Also known as vacuum breakers, these valves have a built-in check valve that blocks backflow, so you can leave your hose in a utility sink full of dirty water without the water going back into the line.
When the check valve is closed, it has vents that open to release the water. This reduces pressure in the line and confirms the valve is working. Because these valves vent water, use them in environments where spilled water won’t cause a problem. This design adheres to ASSE Standard 1011 for valves with a vent.
Mount valves to faucet outlets with a set screw, and easily thread or unthread a hose while the valves stay in place.
Valves comply with Uniform Plumbing Code (UPC) and are CSA certified, so they're safe to use in sanitary plumbing systems because they prevent contamination from flowing backward into your line.
These valves are designed to be used intermittently. They've been tested under ASME A112.1.3, which assumes the valves will not be used for more than 12 hours at a time.
Chrome-plated brass valves are more corrosion resistant than plain brass valves.
Valves with tamper-resistant set screws have a head that breaks off after tightening to prevent valve removal after installation.
Valves that meet NSF/ANSI Standard 372 are certified lead free.
Brass Body | Chrome-Plated Brass Body | |||||||
|---|---|---|---|---|---|---|---|---|
| Hose Size | Max. Pressure | Temperature Range, °F | End-to-End Lg. | Specifications Met | Each | Each | ||
GHT Female × GHT Male | ||||||||
With Set Screw | ||||||||
| 3/4 | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, CSA Certified, CAN/CSA B64.2, NSF/ANSI 372, UPC Compliant, ASME A112.1.3, ASSE 1001 | 00000000 | 000000 | 00000000 | 000000 |
| 3/4 | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, CSA Certified, CAN/CSA B64.2, UPC Compliant, ASME A112.1.3, ASSE 1001 | 00000000 | 00000 | 00000000 | 00000 |
With Tamper-Resistant Set Screw | ||||||||
| 3/4 | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, CSA Certified, CAN/CSA B64.2, NSF/ANSI 372, UPC Compliant, ASME A112.1.3, ASSE 1001 | 00000000 | 00000 | 00000000 | 00000 |
| 3/4 | 125 psi @ 70° F | 30° to 180° | 1 1/2" | ASSE Standard 1011, CSA Certified, CAN/CSA B64.2, UPC Compliant, ASME A112.1.3, ASSE 1001 | 00000000 | 00000 | 00000000 | 00000 |