About Backflow-Prevention Valves
More
Threaded Check Valves for Harsh Chemicals
These valves open to allow flow in one direction and close when flow stops or reverses.
Polypropylene valves are more corrosion resistant than PVC or CPVC 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, 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 |
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, 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 | 125 psi @ 150° F | 1 | 0° to 210° | Semi-Clear White | 2 3/8" | 00000000 | 0000000 |
| 1/2 | 4 | 100 psi @ 150° F | 1 | 0° to 210° | Semi-Clear White | 3 3/8" | 00000000 | 000000 |
NPT Female × NPT Male | ||||||||
| 1/4 | 0.75 | 125 psi @ 150° F | 1 | 0° to 210° | Semi-Clear White | 2 7/16" | 00000000 | 000000 |
NPT Male × NPT Female | ||||||||
| 1/4 | 0.75 | 125 psi @ 150° F | 1 | 0° to 210° | Semi-Clear White | 2 1/16" | 00000000 | 000000 |
NPT Male × NPT Male | ||||||||
| 1/4 | 0.75 | 125 psi @ 150° F | 1 | 0° to 210° | Semi-Clear White | 2 7/16" | 00000000 | 000000 |
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: Stainless Steel
- 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.
| For Tube OD | Pipe Size | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | Each | |
PVDF Plastic Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Push-to-Connect Inlet × NPTF Male Outlet | ||||||||
| 3/8" | 1/4 | 300 psi @ 70° F | 0.5 | 0° to 250° | Black | 1 3/8" | 0000000 | 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
Flanged Check Valves for Harsh Chemicals
- For Use With: Ammonia, Chlorine, Citric Acid, Deionized Water, Diesel Fuel, Ethanol, Ethylene Glycol, Fuel Oil, Gasoline, Hydrochloric Acid, Isopropyl Alcohol, Kerosene, Methanol, Methyl Ethyl Ketone, Mineral Spirits, Oil, Phosphoric Acid, Salt Water, Soap Solutions, Toluene, Water, Xylene
- Ball Material: PTFE Plastic
- Seal Material: PTFE Plastic
Bolt these valves to ANSI flanges. The glass-filled vinyl body and PTFE seal stand up to a wide range of harsh chemicals. Valves 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.
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Color | End-to-End Lg. | For Flange Class | Flange OD | Number of Bolt Holes | Bolt Hole Size | Bolt Circle Dia. | Bolts Included | Each | |
Glass-Filled Vinyl Plastic Body | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Flanged × Flanged | ||||||||||||||
| 1 | 35 | 210 psi @ 250 ° F | 1 | -40° to 250° | Beige | 5" | 150 | 4 1/4" | 4 | 5/8" | 3 1/8" | No | 000000 | 0000000 |
| 2 | 54 | 140 psi @ 250 ° F | 1 | -40° to 250° | Beige | 7" | 150 | 6" | 4 | 3/4" | 4 3/4" | No | 000000 | 000000 |
Threaded Check Valves for Oil and Fuel
These valves open to allow flow in one direction and close when flow stops or reverses. They function both horizontally and vertically. When vertical, the flow arrow must point up.
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: Diesel Fuel, Gasoline, Oil
- Piston Material: Brass
- Spring Material: 302 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
NPT Female Inlet × NPT Female Outlet | |||||||
|---|---|---|---|---|---|---|---|
| 1/8 | 0.6 | 500 psi @ 70° F | 1 | -20° to 180° | 1 3/8" | 0000000 | 000000 |
| 1/4 | 1.2 | 500 psi @ 70° F | 1 | -20° to 180° | 1 13/16" | 0000000 | 00000 |
| 3/8 | 2.2 | 500 psi @ 70° F | 1 | -20° to 180° | 2 1/4" | 0000000 | 00000 |
| 1/2 | 3.1 | 500 psi @ 70° F | 1 | -20° to 180° | 2 9/16" | 0000000 | 00000 |
| 3/4 | 5.4 | 500 psi @ 70° F | 1 | -20° to 180° | 3" | 0000000 | 00000 |
NPT Female Inlet × NPT Male Outlet | |||||||
| 1/8 | 0.4 | 500 psi @ 70° F | 1 | -20° to 180° | 1 1/16" | 0000000 | 00000 |
| 1/4 | 0.7 | 500 psi @ 70° F | 1 | -20° to 180° | 1 3/8" | 0000000 | 00000 |
| 3/8 | 1.6 | 500 psi @ 70° F | 1 | -20° to 180° | 1 15/16" | 0000000 | 00000 |
| 1/2 | 2.4 | 500 psi @ 70° F | 1 | -20° to 180° | 2 1/8" | 0000000 | 00000 |
| 3/4 | 5.7 | 500 psi @ 70° F | 1 | -20° to 180° | 3" | 0000000 | 00000 |
NPT Male Inlet × NPT Male Outlet | |||||||
| 1/8 | 0.2 | 500 psi @ 70° F | 1 | -20° to 180° | 1 3/16" | 0000000 | 00000 |
| 1/4 | 0.7 | 500 psi @ 70° F | 1 | -20° to 180° | 1 1/2" | 0000000 | 00000 |
| 3/8 | 1.4 | 500 psi @ 70° F | 1 | -20° to 180° | 1 3/4" | 0000000 | 00000 |
| 1/2 | 2.4 | 500 psi @ 70° F | 1 | -20° to 180° | 2" | 0000000 | 00000 |
NPT Male Inlet × NPT Female Outlet | |||||||
| 1/8 | 0.4 | 500 psi @ 70° F | 1 | -20° to 180° | 1 1/4" | 0000000 | 00000 |
| 1/4 | 0.7 | 500 psi @ 70° F | 1 | -20° to 180° | 1 5/8" | 0000000 | 00000 |
| 3/8 | 1.6 | 500 psi @ 70° F | 1 | -20° to 180° | 1 15/16" | 0000000 | 00000 |
| 1/2 | 2.2 | 500 psi @ 70° F | 1 | -20° to 180° | 1 7/8" | 0000000 | 00000 |
Plastic Threaded Check Valves for Oil and Fuel
Plastic provides a lightweight alternative to metal. These valves 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.
- For Use With: Diesel Fuel, Gasoline, Oil
- Piston Material: Polypropylene Plastic
- Spring Material: 302 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 Female × NPT Female | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4 | 3 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2" | 0000000 | 000000 |
| 3/8 | 4.2 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 1/16" | 0000000 | 00000 |
| 1/2 | 8.1 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 1/2" | 0000000 | 00000 |
| 3/4 | 14.8 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 3/4" | 0000000 | 00000 |
- For Use With: Diesel Fuel, Gasoline, Oil
- Ball Material: Stainless Steel
- Spring Material: 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 Female × NPT Female | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/8 | 1.1 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 1/4" | 00000000 | 000000 |
| 1/4 | 1.2 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 1/4" | 00000000 | 00000 |
| 1/4 | 1.2 | 125 psi @ 70° F | 0.33 | 35° to 140° | White | 2 1/4" | 00000000 | 00000 |
NPT Female × NPT Male | ||||||||
| 1/4 | Not Rated | 125 psi @ 70° F | 0.33 | 35° to 140° | White | 2 9/16" | 00000000 | 00000 |
| 1/4 | 1 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 9/16" | 00000000 | 00000 |
NPT Male × NPT Female | ||||||||
| 1/8 | 1 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 7/16" | 00000000 | 00000 |
| 1/4 | Not Rated | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 9/16" | 00000000 | 00000 |
NPT Male × NPT Male | ||||||||
| 1/8 | 0.9 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 11/16" | 00000000 | 00000 |
| 1/4 | 1 | 125 psi @ 70° F | 0.33 | 35° to 140° | Black | 2 7/8" | 00000000 | 00000 |
High-Pressure Threaded Check Valves for Oil and Fuel
- For Use With: Diesel Fuel, Gasoline, Oil
- Ball Material: 316 Stainless Steel
- Spring Material: 302 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
Rated for at least four times the pressure of standard check valves for oil and fuel, these are often used in hydraulic applications. 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 | |
Brass Body | |||||||
|---|---|---|---|---|---|---|---|
NPT Female Inlet × NPT Female Outlet | |||||||
| 1/4 | 1.1 | 3,000 psi @ 70° F | 1 | -20° to 180° | 2 9/16" | 0000000 | 000000 |
| 3/8 | 1.4 | 3,000 psi @ 70° F | 1 | -20° to 180° | 2 9/16" | 0000000 | 00000 |
| 1/2 | 2.1 | 2,000 psi @ 70° F | 1 | -20° to 180° | 3 3/16" | 0000000 | 000000 |
NPT Female Inlet × NPT Male Outlet | |||||||
| 1/4 | 1.1 | 3,000 psi @ 70° F | 1 | -20° to 180° | 2 11/16" | 0000000 | 00000 |
| 3/8 | 1.1 | 3,000 psi @ 70° F | 1 | -20° to 180° | 2 11/16" | 0000000 | 00000 |
| 1/2 | 2.4 | 2,000 psi @ 70° F | 1 | -20° to 180° | 3 3/16" | 0000000 | 000000 |
NPT Male Inlet × NPT Male Outlet | |||||||
| 1/4 | 1.1 | 3,000 psi @ 70° F | 1 | -20° to 180° | 2 11/16" | 0000000 | 00000 |
| 3/8 | 1.1 | 3,000 psi @ 70° F | 1 | -20° to 180° | 2 11/16" | 0000000 | 00000 |
| 1/2 | 2.4 | 2,000 psi @ 70° F | 1 | -20° to 180° | 3 3/16" | 0000000 | 000000 |
NPT Male Inlet × NPT Female Outlet | |||||||
| 1/4 | 1.1 | 3,000 psi @ 70° F | 1 | -20° to 180° | 2 9/16" | 0000000 | 00000 |
| 3/8 | 1.1 | 3,000 psi @ 70° F | 1 | -20° to 180° | 2 9/16" | 0000000 | 00000 |
| 1/2 | 2.4 | 2,000 psi @ 70° F | 1 | -20° to 180° | 3 3/16" | 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 |
Socket-Connect Check Valves for Oil and Fuel
Insert unthreaded pipe into the socket ends and weld to create a permanent, leak-tight connection. These heavy duty valves can withstand pressures up to 1,975 psi and temperatures up to 800° F. They open to allow flow in one direction and close when flow stops or reverses. A removable cap provides easy access to internal components for maintenance.
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: Diesel Fuel, Gasoline, Natural Gas, Oil
- Piston Material: 420 Stainless Steel
- Spring Material: 304 Stainless Steel
- Seal Material: 304 Stainless Steel, Graphite
| Pipe Size | Flow Coefficient (Cv) | Pressure Class | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Features | Each | |
Socket Connect × Socket Connect | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 3/4 | 2.69 | 800 | 1,975 psi @ 100° F | 34 | -20° to 800° | 3 5/8" | Removable Cap | 0000000 | 0000000 |
| 1 | 5.08 | 800 | 1,975 psi @ 100° F | 45 | -20° to 800° | 4 3/8" | Removable Cap | 0000000 | 000000 |
| 2 | 22.34 | 800 | 1,975 psi @ 100° F | 80 | -20° to 800° | 6 13/16" | Removable Cap | 0000000 | 000000 |