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About Backflow-Prevention Valves
More
Easy-to-Install Threaded Check Valves for Harsh Chemicals
To reduce installation time and allow for maintenance without detaching pipe connections, these valves have union fittings. The plastic body and fluoroelastomer seal provide excellent chemical resistance. Valves open to allow flow in one direction and close when flow stops or reverses.
PVC and CPVC valves come with unthreaded socket-connect female fittings in addition to the threaded NPT female fittings.
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.
- For Use With:
BSPP thread type:
Butane, Kerosene, Drinking Water, Liquid Carbon Dioxide, Natural Gas, Nitric Acid, Oxygen, Phosphoric Acid, Propane, Salt Water, Soap Solutions, Water
NPT thread type:
Citric Acid, Diesel Fuel, Drinking Water, Ethylene Glycol, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Sodium Hypochlorite, Water - Ball Material: PVC Plastic
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Specifications Met | Each | |
BSPP Female × BSPP Female | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 6.3 | 150 psi @ 70° F | 1 | 40° to 140° | Dark Gray | 4 1/4" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
| 1 | 25 | 150 psi @ 70° F | 1 | 40° to 140° | Dark Gray | 5 3/16" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
Threaded Check Valves for Harsh Chemicals
These valves open to allow flow in one direction and close when flow stops or reverses.
Valves for drinking water meet NSF/ANSI Standard 61.
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.
- For Use With: Air, Ammonia, Butane, Carbon Dioxide, Chlorine, Citric Acid, Deionized Water, Diesel Fuel, Ethylene Glycol, Fuel Oil, Gasoline, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Natural Gas, Nitric Acid, Oil, Oxygen, Phosphoric Acid, Propane, Salt Water, Sodium Hydroxide, Toluene, Water, Xylene
- Ball Material: 316 Stainless Steel
- Spring Material: 316 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Each | |
NPT Male × NPT Male  | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/8 | Not Rated | 220 psi @ 70° F | 2.5 | 40° to 180° | White | 1" | 00000000 | 000000 |
| 1/4 | Not Rated | 220 psi @ 70° F | 2.5 | 40° to 180° | White | 1 7/16" | 00000000 | 00000 |
| 3/8 | Not Rated | 220 psi @ 70° F | 2.5 | 40° to 180° | White | 1 1/2" | 00000000 | 00000 |
| 1/2 | Not Rated | 220 psi @ 70° F | 2.5 | 40° to 180° | White | 1 13/16" | 00000000 | 00000 |
- For Use With: Air, Butane, Carbon Dioxide, Citric Acid, Deionized Water, Diesel Fuel, Drinking Water, Ethanol, Ethylene Glycol, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Methanol, Mineral Spirits, Natural Gas, Oil, Oxygen, Phosphoric Acid, Potable Water, Propane, Salt Water, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Water
- Ball Material: PVC Plastic
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Specifications Met | Each | |
NPT Female × NPT Female | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/4 | 1 | 150 psi @ 70° F | 1.5 | 35° to 140° | Dark Gray | 3" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
| 3/8 | 3 | 150 psi @ 70° F | 1.5 | 35° to 140° | Dark Gray | 3" | ASTM D1784, NSF/ANSI 61 | 0000000 | 00000 |
| 3 | 250 | 150 psi @ 70° F | 1.5 | 35° to 140° | Dark Gray | 10 9/16" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
| 4 | 400 | 150 psi @ 70° F | 1.5 | 35° to 140° | Dark Gray | 12 15/16" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
- For Use With: Air, Butane, Carbon Dioxide, Citric Acid, Deionized Water, Diesel Fuel, Drinking Water, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Mineral Spirits, Natural Gas, Nitric Acid, Oxygen, Phosphoric Acid, Potable Water, Propane, Salt Water, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Sulfuric Acid, Water
- Ball Material: CPVC Plastic
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Specifications Met | Each | |
NPT Female × NPT Female | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 3 | 250 | 150 psi @ 70° F | 1.5 | 35° to 190° | Dark Gray | 10 9/16" | ASTM D1784, NSF/ANSI 61 | 0000000 | 0000000 |
| 4 | 400 | 150 psi @ 70° F | 1.5 | 35° to 190° | Dark Gray | 12 15/16" | ASTM D1784, NSF/ANSI 61 | 0000000 | 000000 |
Ultra-Chemical-Resistant Threaded Check Valves
- For Use With: Acetone, Ammonia, Butane, Carbon Dioxide, Citric Acid, Diesel Fuel, Ethylene Glycol, Fuel Oil, Gasoline, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Methanol, Methyl Ethyl Ketone, Mineral Spirits, Natural Gas, Nitric Acid, Nitrogen, Oil, Oxygen, Phosphoric Acid, Propane, Salt Water, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Steam, Sulfuric Acid, Toluene, Water, Xylene
- Piston Material: PTFE Plastic
- Spring Material: PTFE Plastic
The most chemical-resistant check valves in our offering, these have a PFA body to withstand methyl ethyl ketone, sodium hypochlorite, and other extremely harsh chemicals. They open to allow flow in one direction and close when flow stops or reverses.
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.
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Each | |
PFA Plastic Body | ||||||||
|---|---|---|---|---|---|---|---|---|
NPT Female × NPT Female | ||||||||
| 1/4 | 0.75 | 100 psi @ 150° F | 1 | 0° to 200° | White | 2 3/8" | 00000000 | 0000000 |
| 1/2 | 4 | 100 psi @ 150° F | 1 | 0° to 200° | White | 3 3/8" | 00000000 | 000000 |
NPT Female × NPT Male | ||||||||
| 1/4 | 0.75 | 100 psi @ 150° F | 1 | 0° to 200° | White | 2 7/16" | 00000000 | 000000 |
NPT Male × NPT Female | ||||||||
| 1/4 | 0.75 | 100 psi @ 150° F | 1 | 0° to 200° | White | 2 1/16" | 00000000 | 000000 |
NPT Male × NPT Male | ||||||||
| 1/4 | 0.75 | 100 psi @ 150° F | 1 | 0° to 200° | White | 2 7/16" | 00000000 | 000000 |
Check Valves with Barbed Fittings for Harsh Chemicals
Prevent backflow in chemical tubing lines. These valves have barbed fittings that grip onto tubing, providing a secure hold. The plastic body and fluoroelastomer seal provide excellent chemical resistance. Valves open to allow flow in one direction and close when flow stops or reverses.
PVDF valve resists abrasion and UV light.
Polypropylene valves are more corrosion resistant than nylon valves.
Nylon valves are more impact resistant than polypropylene valves.
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.
- For Use With: Air, Butane, Chlorine, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Gasoline, Hydrochloric Acid, Nitric Acid, Oil, Propane, Salt Water, Soap Solutions, Sodium Hypochlorite, Sulfuric Acid, Water
- Diaphragm Material: Fluoroelastomer Rubber
- Seal Material: Fluoroelastomer Rubber
| For Tube ID | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Each | |
Barbed × Barbed | |||||||
|---|---|---|---|---|---|---|---|
| 1/4" | 15 psi @ 70° F | 0.5 | -20° to 250° | White | 1 21/32" | 00000000 | 00000 |
- For Use With: Acetone, Air, Argon, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Fuel Oil, Gasoline, Helium, Kerosene, Krypton, Mineral Spirits, Neon, Nitrogen, Oil, Propane, Salt Water, Soap Solutions, Toluene, Water, Xenon, Xylene
- Ball Material: 316 Stainless Steel
- Spring Material: 302 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
- For Use With: Acetone, Air, Argon, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Fuel Oil, Gasoline, Helium, Kerosene, Krypton, Mineral Spirits, Neon, Nitrogen, Oil, Propane, Salt Water, Soap Solutions, Toluene, Water, Xenon, Xylene
- Ball Material: 316 Stainless Steel
- Spring Material: 302 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
Check Valves with Push-to-Connect Fittings for Harsh Chemicals
- For Use With: Air, Argon, Butane, Carbon Dioxide, Chlorine, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Gasoline, Helium, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Krypton, Mineral Spirits, Natural Gas, Neon, Nitric Acid, Nitrogen, Oil, Oxygen, Phosphoric Acid, Propane, Salt Water, Soap Solutions, Sodium Hypochlorite, Sulfuric Acid, Toluene, Water, Xenon, Xylene
- Piston Material: PVDF Plastic
- Spring Material: PVDF Plastic
- Seal Material: Fluoroelastomer Rubber
Connect your outlet tubing into the push-to-connect fittings—no heat, solder, or flux required. These valves have a PVDF body and a fluoroelastomer seal for excellent chemical resistance. They open to allow flow in one direction and close when flow stops or reverses.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | For Tube OD | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Each | |
PVDF Plastic Body | ||||||||
|---|---|---|---|---|---|---|---|---|
NPTF Male Inlet × Push-to-Connect Outlet | ||||||||
| 1/4 | 3/8" | 300 psi @ 70° F | 0.5 | 0° to 250° | Black | 1 3/8" | 0000000 | 000000 |
| 1/4 | 3/8" | 300 psi @ 70° F | 1.5 | 0° to 250° | Black/Blue | 1 3/8" | 0000000 | 00000 |
| 1/4 | 3/8" | 300 psi @ 70° F | 3 | 0° to 250° | Black/Red | 1 3/8" | 0000000 | 00000 |
| 1/4 | 3/8" | 300 psi @ 70° F | 4 | 0° to 250° | Black/Green | 1 3/8" | 0000000 | 00000 |
High-Temperature Threaded Check Valves for Oil and Fuel
- For Use With: Butane, Diesel Fuel, Fuel Oil, Natural Gas, Propane
- Piston Material: Brass
- Spring Material: 316 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
For more than twice the temperature rating of standard check valves for oil and fuel, these have a heat-resistant fluoroelastomer seal that can withstand temperatures up to 500° F. They open to allow flow in one direction and close when flow stops or reverses.
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.
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Bronze Body | |||||||
|---|---|---|---|---|---|---|---|
NPT Female × NPT Female | |||||||
| 1/4 | Not Rated | 300 psi @ 70° F | 2 | 50° to 500° | 2 1/4" | 0000000 | 000000 |
| 3/8 | Not Rated | 300 psi @ 70° F | 2 | 50° to 500° | 2 1/4" | 0000000 | 00000 |
| 1/2 | 26 | 300 psi @ 70° F | 2 | 50° to 500° | 2 1/2" | 0000000 | 00000 |
| 3/4 | 50 | 300 psi @ 70° F | 2 | 50° to 500° | 2 3/4" | 0000000 | 000000 |
| 1 | 94 | 300 psi @ 70° F | 2 | 50° to 500° | 3 3/8" | 0000000 | 000000 |
| 1 1/4 | Not Rated | 300 psi @ 70° F | 2 | 50° to 500° | 3 3/4" | 0000000 | 000000 |
Flange-Mount Check Valves for Oil and Fuel
- For Use With: Butane, Diesel Fuel, Fuel Oil, Gasoline, Kerosene, Natural Gas, Oil, Propane
- Disc Material: 316 Stainless Steel
- Seal Material: 316 Stainless Steel
Install these valves between ANSI flanges. ANSI flanges are sold separately. All valves open to allow flow in one direction and close when flow stops or reverses. 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.
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | For Flange Class | Each | |
316 Stainless Steel Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Flanged × Flanged | ||||||||
| 2 | 48 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 3/8" | 150, 300, 600 | 0000000 | 0000000 |
| 2 1/2 | 90 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 5/8" | 150, 300, 600 | 0000000 | 000000 |
| 3 | 171 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 7/8" | 150, 300, 600 | 0000000 | 000000 |
| 4 | 291 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 7/8" | 150, 300 | 0000000 | 000000 |
| 6 | 705 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 3 7/8" | 150, 300 | 0000000 | 00000000 |
| 8 | 1,795 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 5" | 150, 300 | 0000000 | 00000000 |
Pipeline Flame Arresters
- For Use With: Butane, Natural Gas, Propane
- Flame-Arresting Element Material: 316 Stainless Steel
To prevent flashback in flammable gas pipelines, an internal flame-arresting element absorbs the heat from a fire to extinguish the flame. These valves are commonly used in pilot lines connected to waste gas burners.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | Max. Pressure | Max. Temperature, °F | End-to-End Lg. | Each | |
Aluminum Body | |||||
|---|---|---|---|---|---|
NPT Female | |||||
| 1/4 | 25 psi @ 176° F | 176° | 3" | 0000000 | 0000000 |
| 1/2 | 25 psi @ 176° F | 176° | 3 3/4" | 0000000 | 000000 |
| 3/4 | 25 psi @ 176° F | 176° | 3 3/4" | 0000000 | 000000 |
| 1 | 25 psi @ 176° F | 176° | 3 3/4" | 0000000 | 000000 |
| 1 1/2 | 25 psi @ 176° F | 176° | 3 3/4" | 0000000 | 000000 |
| 2 | 25 psi @ 176° F | 176° | 4 3/4" | 0000000 | 000000 |
Welding Gas Check Valves for Regulators
Stop the reverse flow of gas in your regulator. Check valves do not stop flashbacks.
Max. Pressure, psi | Male Hose Connection | Male Pipe Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Acetylene | Hydrogen | Propane | Thread Direction | Thread Size | Thread Type | Thread Direction | Pipe Size | Thread Type | Material | Each | |
| 50 | 50 | 50 | Right Hand | 9/16"-18 | UNF | Left Hand | 1/4 | NPT | Brass | 000000 | 000000 |
Welding Gas Check Valves for Torches
Stop the reverse flow of gas in your torch. Check valves do not stop flashbacks.
Welding Gas Flashback Arresters for Torches
These arresters attach directly to torches that cut steel up to 8" thick. They extinguish flames and have a check valve to stop reverse gas flow. They are reusable; resetting is not required after flashback.
Arresters with right-hand threads are for use with oxygen; arresters with left-hand threads are for use with acetylene, hydrogen, and propane.
Max. Pressure, psi | Male Hose Connection | Female Hose Connection | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Acetylene | Hydrogen | Propane | Thread Size | Thread Type | Thread Size | Thread Type | Material | Specifications Met | Each | |
| 15 | 50 | 50 | 9/16"-18 | UNF | 9/16"-18 | UNF | Brass | European Safety Specification EN730, ISO 5175 Class 1 | 00000000 | 000000 |
Max. Pressure, psi | Male Hose Connection | Female Hose Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oxygen | Acetylene | Hydrogen | Propane | Thread Size | Thread Type | Thread Size | Thread Type | Material | Specifications Met | Pair | |
| 143 | 15 | 50 | 50 | 9/16"-18 | UNF | 9/16"-18 | UNF | Brass | European Safety Specification EN730, ISO 5175 Class 1 | 00000000 | 000000 |
Welding Gas Flashback Arresters for Regulators
Attach these arresters to the outlet connection of a regulator on a torch that cuts steel up to 11" thick. Arresters extinguish flames and have a check valve to stop reverse gas flow. They are reusable; resetting is not required after flashback.
Arresters with right-hand threads are for use with oxygen; arresters with left-hand threads are for use with acetylene, hydrogen, and propane.
Max. Pressure, psi | Male Hose Connection | Female Hose Connection | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Acetylene | Hydrogen | Propane | Thread Size | Thread Type | Thread Size | Thread Type | Material | Specifications Met | Each | |
| 15 | 50 | 50 | 9/16"-18 | UNF | 9/16"-18 | UNF | Brass | European Safety Specification EN730, ISO 5175 Class 1 | 00000000 | 000000 |
Max. Pressure, psi | Male Hose Connection | Female Hose Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oxygen | Acetylene | Hydrogen | Propane | Thread Size | Thread Type | Thread Size | Thread Type | Material | Specifications Met | Pair | |
| 143 | 15 | 50 | 50 | 9/16"-18 | UNF | 9/16"-18 | UNF | Brass | European Safety Specification EN730, ISO 5175 Class 1 | 00000000 | 000000 |