About Backflow-Prevention Valves
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Check Valves with Solder-Connect Fittings
- For Use With: Steam, Water
- Disc Material: Bronze
- Seal Material: Bronze
Solder these valves to copper tubing for a permanent, leak-tight connection. They open to allow flow in one direction and close when flow stops or reverses. All have a removable cap that 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 Copper Tube Size  | For Tube OD | Flow Coefficient (Cv) | Pressure Class | Max. Pressure | Max. Steam Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Features | Each | |
Bronze Body | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Solder Connect × Solder Connect | |||||||||||
| 1/4 | 3/8" | 1.3 | 125 | 200 psi @ 70° F | 125 psi @ 350° F | 0.5 | -20° to 405° | 2 1/16" | Removable Cap | 0000000 | 000000 |
| 3/8 | 1/2" | 2.5 | 125 | 200 psi @ 70° F | 125 psi @ 350° F | 0.5 | -20° to 405° | 2 1/16" | Removable Cap | 0000000 | 00000 |
| 1/2 | 5/8" | 4.8 | 125 | 200 psi @ 70° F | 125 psi @ 350° F | 0.5 | -20° to 405° | 2 9/16" | Removable Cap | 0000000 | 00000 |
| 3/4 | 7/8" | 14.3 | 125 | 200 psi @ 70° F | 125 psi @ 350° F | 0.5 | -20° to 405° | 3 3/8" | Removable Cap | 0000000 | 000000 |
| 1 | 1 1/8" | 24 | 125 | 200 psi @ 70° F | 125 psi @ 350° F | 0.5 | -20° to 405° | 4 1/16" | Removable Cap | 0000000 | 000000 |
| 1 1/2 | 1 5/8" | 60 | 125 | 200 psi @ 70° F | 125 psi @ 350° F | 0.5 | -20° to 405° | 5 1/4" | Removable Cap | 0000000 | 000000 |
| 2 | 2 1/8" | 102 | 125 | 200 psi @ 70° F | 125 psi @ 350° F | 0.5 | -20° to 405° | 6 3/8" | Removable Cap | 0000000 | 000000 |
Check Valves with Solder-Connect Fittings for Drinking Water
- For Use With: Drinking Water
- Piston Material: Polyetherimide Plastic
- Spring Material: 302 Stainless Steel
- Seal Material: Buna-N Rubber
Solder these valves to copper tubing for a permanent, leak-tight connection. They meet NSF/ANSI 61 for use in drinking water lines. All 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 Tube OD | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Specifications Met | Each | |
Brass Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Solder Connect × Solder Connect | ||||||||
| 1/2" | 9.36 | 400 psi @ 180° F | 0.5 | 10° to 210° | 3 7/16" | ASME B16.18, NSF/ANSI 61 | 000000 | 000000 |
| 3/4" | 16.3 | 400 psi @ 180° F | 0.5 | 10° to 210° | 4 3/16" | ASME B16.18, NSF/ANSI 61 | 000000 | 00000 |
| 1" | 24.16 | 400 psi @ 180° F | 0.5 | 10° to 210° | 4 7/8" | ASME B16.18, NSF/ANSI 61 | 000000 | 00000 |
| 1 1/2" | 51.9 | 400 psi @ 180° F | 0.5 | 10° to 210° | 5 13/16" | ASME B16.18, NSF/ANSI 61 | 000000 | 000000 |
Check Valves for Refrigerant
- Spring Material: Stainless Steel
- Seal Material: Neoprene Rubber
- Ball Material: Stainless Steel
- For Use With: Refrigerant
Use these valves in refrigeration and air-conditioning systems. All open to allow flow in one direction and close when flow stops or reverses. They solder to copper tubing for a permanent, leak-tight connection.
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 Copper Tube Size | For Tube OD | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Copper Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Solder Connect × Solder Connect | ||||||||
| 1/4 | 3/8" | 1.2 | 755 psi @ 300° F | 1 | -40° to 300° | 3 3/4" | 0000000 | 000000 |
| 3/8 | 1/2" | 2.2 | 755 psi @ 300° F | 1 | -40° to 300° | 3 3/4" | 0000000 | 00000 |
| 3/4 | 7/8" | 7.5 | 755 psi @ 300° F | 1 | -40° to 300° | 4 1/2" | 0000000 | 00000 |
| 1 | 1 1/8" | 12.4 | 755 psi @ 300° F | 1 | -40° to 300° | 5" | 0000000 | 000000 |
Two-Stage Backflow-Prevention Valves with Solder-Connect Fittings
- For Use With: Air, Water
- Disc Material: EPDM Rubber
- Seal Material: EPDM Rubber
Solder these valves to copper tubing for a permanent, leak-tight connection. They have two integral check valves with a vent between them for maximum protection from system contamination. If the primary check valve fails to close when flow stops or reverses, overflow is discharged through the threaded vent and the secondary check valve prevents backflow. Attach the vent to drain pipes to prevent spillage. These valves are designed for applications with continuous flow and are commonly used on water supply lines to boilers, processing tanks, and other equipment. All have an integral strainer to prevent debris from blocking the check valves.
For technical drawings and 3-D models, click on a part number.
Vent Port | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Copper Tube Size | For Tube OD | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Vent Type | Gender | Pipe Size | Thread Type | Features | Each | |
Brass Body | ||||||||||||
Solder Connect × Solder Connect | ||||||||||||
| 1/2 | 5/8" | 175 psi @ 250° F | 25 | 35° to 250° | 4 3/8" | Threaded | Female | 1/2 | NPT | Strainer | 0000000 | 0000000 |
| 3/4 | 7/8" | 175 psi @ 250° F | 25 | 35° to 250° | 4 13/16" | Threaded | Female | 1/2 | NPT | Strainer | 0000000 | 000000 |