About Backflow-Prevention Valves
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Compact Threaded Check Valves
- For Use With: Air, Nitrogen, Water
- Ball Material: 304 Stainless Steel
- Seal Material: See table
With a shorter end-to-end length than other check valves, these fit in tight spaces. They open to allow flow in one direction and close when flow stops or reverses.
303 stainless steel valves are more corrosion resistant than brass 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.
Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Brass Body | |||||||
|---|---|---|---|---|---|---|---|
304 Stainless Steel Seal | |||||||
| 1/8 | 0.081 | 200 psi @ 70° F | 2 | 35° to 300° | 1" | 0000000 | 000000 |
| 1/4 | 0.19 | 200 psi @ 70° F | 2 | 35° to 300° | 1 3/8" | 0000000 | 00000 |
304 Stainless Steel Seal with Loctite® Internal Sealant | |||||||
| 1/8 | 0.081 | 2,000 psi @ 70° F | 2 | 35° to 300° | 1" | 00000000 | 00000 |
| 1/4 | 0.19 | 2,000 psi @ 70° F | 2 | 35° to 300° | 1 3/8" | 00000000 | 00000 |
303 Stainless Steel Body | |||||||
304 Stainless Steel Seal | |||||||
| 1/8 | 0.081 | 200 psi @ 70° F | 2 | 35° to 300° | 1" | 0000000 | 00000 |
| 1/4 | 0.19 | 200 psi @ 70° F | 2 | 35° to 300° | 1 3/8" | 0000000 | 00000 |
304 Stainless Steel Seal with Loctite® Internal Sealant | |||||||
| 1/8 | 0.081 | 2,000 psi @ 70° F | 2 | 35° to 300° | 1" | 00000000 | 00000 |
| 1/4 | 0.19 | 2,000 psi @ 70° F | 2 | 35° to 300° | 1 3/8" | 00000000 | 00000 |
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Brass Body | |||||||
|---|---|---|---|---|---|---|---|
304 Stainless Steel Seal | |||||||
| 1/8 | 0.081 | 200 psi @ 70° F | 2 | 35° to 300° | 7/8" | 00000000 | 000000 |
| 1/4 | 0.19 | 200 psi @ 70° F | 2 | 35° to 300° | 1 1/4" | 00000000 | 00000 |
303 Stainless Steel Body | |||||||
304 Stainless Steel Seal | |||||||
| 1/8 | 0.081 | 200 psi @ 70° F | 2 | 35° to 300° | 7/8" | 00000000 | 00000 |
| 1/4 | 0.19 | 200 psi @ 70° F | 2 | 35° to 300° | 1 1/4" | 00000000 | 00000 |
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Brass Body | |||||||
|---|---|---|---|---|---|---|---|
304 Stainless Steel Seal | |||||||
| 1/8 | 0.081 | 200 psi @ 70° F | 2 | 35° to 300° | 7/8" | 00000000 | 000000 |
| 1/4 | 0.19 | 200 psi @ 70° F | 2 | 35° to 300° | 1 1/4" | 00000000 | 00000 |
303 Stainless Steel Body | |||||||
304 Stainless Steel Seal | |||||||
| 1/8 | 0.081 | 200 psi @ 70° F | 2 | 35° to 300° | 7/8" | 00000000 | 00000 |
| 1/4 | 0.19 | 200 psi @ 70° F | 2 | 35° to 300° | 1 1/4" | 00000000 | 00000 |
| Thread Size | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Brass Body | |||||||
|---|---|---|---|---|---|---|---|
304 Stainless Steel Seal | |||||||
| 10-32 | 0.081 | 125 psi @ 70° F | 2 | 35° to 150° | 13/16" | 0000000 | 000000 |
303 Stainless Steel Body | |||||||
304 Stainless Steel Seal | |||||||
| 10-32 | 0.081 | 125 psi @ 70° F | 2 | 35° to 150° | 13/16" | 0000000 | 00000 |
Check Valves with Push-to-Connect Fittings
Insert tubing into the push-to-connect fittings—no heat, solder, or flux required. 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:
Inch: Air, Argon, Helium, Krypton, Neon, Nirtrogen, Oil, Water, Xenon
Metric: Air, Helium, Krypton, Neon, Nitrogen, Oil, Water, Xenon - Piston Material: Brass
- Spring Material: 302 Stainless Steel
- Seal Material: See Table
| For Tube OD | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Seal Material | End-to-End Lg. | Each | |
| 1/4" | Not Rated | 115 psi @ 70° F | 3 | 0° to 160° | Viton® Fluoroelastomer | 2 1/16" | 00000000 | 000000 |
| 3/8" | Not Rated | 115 psi @ 70° F | 3 | 0° to 160° | Viton® Fluoroelastomer | 2 1/4" | 00000000 | 00000 |
| 4mm | Not Rated | 115 psi @ 70° F | 3 | 0° to 175° | Buna-N Rubber | 1 3/4" | 00000000 | 00000 |
| 6mm | Not Rated | 115 psi @ 70° F | 3 | 0° to 175° | Buna-N Rubber | 2 1/16" | 00000000 | 00000 |
| 8mm | Not Rated | 115 psi @ 70° F | 3 | 0° to 175° | Buna-N Rubber | 2 1/4" | 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 inlet 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.
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: 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
Vacuum-Breaking Valves for Chemicals
A plastic body withstands pH neutralizing, cleaning, and plating solutions containing sodium hydroxide, methyl ethyl ketone, and other harsh chemicals. 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.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Ammonia, Argon, Beverage, Carbon Dioxide, Chlorinated Water, Diesel Fuel, Drinking Water, Ethylene Glycol, Food, Helium, Hydrochloric Acid, Kerosene, Krypton, Liquid Carbon Dioxide, Methanol, Methyl Ethyl Ketone, Mineral Spirits, Natural Gas, Neon, Nitric Acid, Nitrogen, Oil, Oxygen, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Water, Xenon
- Diaphragm Material: Fluoroelastomer Rubber
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | For Pipe Schedule | Max. Pressure | Min. Opening Pressure, psi | End-to-End Lg. | Color | Temperature Range, °F | Each | |
PVC Plastic Body | ||||||||
|---|---|---|---|---|---|---|---|---|
NPT Female × NPT Female | ||||||||
| 1/2 | 80 | 100 psi @ 75° F | 1 | 4 5/16" | Gray | 40° to 140° | 000000 | 0000000 |
| 3/4 | 80 | 100 psi @ 75° F | 1 | 4 5/8" | Gray | 40° to 140° | 0000000 | 000000 |
| 1 | 80 | 100 psi @ 75° F | 1 | 5 1/8" | Gray | 40° to 140° | 0000000 | 000000 |
CPVC Plastic Body | ||||||||
NPT Female × NPT Female | ||||||||
| 1/2 | 80 | 100 psi @ 75° F | 1 | 4 5/16" | Light Gray | 40° to 180° | 0000000 | 000000 |
| 3/4 | 80 | 100 psi @ 75° F | 1 | 4 5/8" | Light Gray | 40° to 180° | 0000000 | 000000 |
| 1 | 80 | 100 psi @ 75° F | 1 | 5 1/8" | Light Gray | 40° to 180° | 0000000 | 000000 |
- For Use With: Air, Ammonia, Argon, Beverage, Carbon Dioxide, Chlorinated Water, Diesel Fuel, Drinking Water, Ethylene Glycol, Food, Helium, Hydrochloric Acid, Kerosene, Krypton, Liquid Carbon Dioxide, Methanol, Methyl Ethyl Ketone, Mineral Spirits, Natural Gas, Neon, Nitric Acid, Nitrogen, Oil, Oxygen, Soap Solutions, Sodium Hydroxide, Sodium Hypochlorite, Water, Xenon
- Piston Material:
PVC Plastic Body: PVC Plastic
CPVC Plastic Body: CPVC Plastic - Spring Material: Plastic Polymer
- Seal Material: Fluoroelastomer Rubber
| Pipe Size | For Pipe Schedule | Max. Pressure | Min. Opening Pressure, psi | End-to-End Lg. | Color | Temperature Range, °F | Each | |
PVC Plastic Body | ||||||||
|---|---|---|---|---|---|---|---|---|
NPT Female × NPT Female | ||||||||
| 2 | 80 | 100 psi @ 75° F | 1 | 8 1/2" | Gray | 40° to 140° | 0000000 | 0000000 |
CPVC Plastic Body | ||||||||
NPT Female × NPT Female | ||||||||
| 1 1/2 | 80 | 100 psi @ 75° F | 1 | 7 15/16" | Light Gray | 40° to 180° | 0000000 | 000000 |