About Backflow-Prevention Valves
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Check Valves with Yor-Lok Fittings
Two sleeves give these fittings extra gripping power. They bite into tubing as you tighten the nut to form a strong seal. All are compatible with Swagelok®, Let-Lok, and Parker A-Lok fittings. Valves open to allow flow in one direction and close when flow stops or reverses.
316 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.
- For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
- Piston Material: 316 Stainless Steel
- Spring Material: 302 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
| For Tube OD | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Yor-Lok Female Inlet × Yor-Lok Female Outlet | |||||||
|---|---|---|---|---|---|---|---|
| 12mm | 1.68 | 3,000 psi @ 70° F | 0.33 | -10° to 375° | 3 1/16" | 00000000 | 0000000 |
| 10mm | 1.68 | 3,000 psi @ 70° F | 0.33 | -10° to 375° | 2 1/2" | 00000000 | 000000 |
| 6mm | 0.47 | 3,000 psi @ 70° F | 0.33 | -10° to 375° | 2 3/8" | 00000000 | 000000 |
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 | |
| 4mm | Not Rated | 115 psi @ 70° F | 3 | 0° to 175° | Buna-N Rubber | 1 3/4" | 00000000 | 000000 |
| 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 |
Check Valves with Push-to-Connect Fittings for Drinking Water
- For Use With: Drinking Water
- Piston Material: Acetal Plastic
- Spring Material:
For 1/2", 8mm, and 10mm Tube ODs: Acetal Plastic
All other sizes: Stainless Steel - Seal Material: See table
Insert tubing into the push-to-connect fittings on these valves—no heat, solder, or flux required. Valves meet NSF/ANSI 61 for use in drinking water systems. All 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 | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Seal Material | Color | End-to-End Lg. | Each | |
Acetal Plastic Body  | ||||||||
|---|---|---|---|---|---|---|---|---|
Push to Connect × Push to Connect | ||||||||
| 6mm | 145 psi @ 150° F | 0.29 | 35° to 145° | EPDM Rubber | Black | 1 15/16" | 0000000 | 000000 |
| 8mm | 145 psi @ 70° F | 0.333 | 35° to 145° | EPDM Rubber | White | 1 15/16" | 0000000 | 00000 |
| 10mm | 145 psi @ 70° F | 0.333 | 35° to 145° | EPDM Rubber | White | 2 1/4" | 0000000 | 00000 |
| 12mm | 100 psi @ 150° F | 0.29 | 35° to 145° | EPDM Rubber/ Nitrile Rubber/ Silicone Rubber | Black | 2 11/16" | 000000 | 00000 |