About Backflow-Prevention Valves
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High-Cycling Check Valves
With internal components that resist wear from frequent operation, these valves can cycle as often as once per second. Barbed fittings and unthreaded fittings grip onto tubing, providing a secure hold. All valves open to allow flow in one direction and close when flow stops or reverses.
Nylon valves are more impact resistant than polypropylene valves.
Polypropylene valves are more corrosion resistant than nylon valves.
- For Use With: Air, Water
- Diaphragm Material: See table
- Seal Material: See table
| For Tube ID | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Diaphragm Material | Seal Material | Color | End-to-End Lg. | Each | |
Unthreaded Male Inlet × Unthreaded Male Outlet | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/8" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluorosilicone Rubber | Fluorosilicone Rubber | Black | 1 5/8" | 00000000 | 00000 |
- For Use With: Air, Water
- Diaphragm Material: See table
- Seal Material: See table
| For Tube ID | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Diaphragm Material | Seal Material | Color | End-to-End Lg. | Each | |
Unthreaded Male Inlet × Unthreaded Male Outlet | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/8" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluoroelastomer Rubber | Fluoroelastomer Rubber | White | 1 5/8" | 00000000 | 00000 |
| 1/8" | 15 psi @ 70° F | 0.5 | -20° to 250° | Fluorosilicone Rubber | Fluorosilicone Rubber | Black | 1 5/8" | 000000000 | 0000 |
Threaded Two-Stage Backflow-Prevention Valves
- For Use With: Air, Water
- Disc Material: EPDM Rubber
- Seal Material: EPDM Rubber
For maximum protection from system contamination, these valves have two integral check valves with a vent between them. If the primary check valve fails to close when flow stops or reverses, overflow is discharged through the vent and the secondary check valve prevents backflow.
Chrome-plated brass valve is more corrosion resistant than plain brass valves.
Valve with an unthreaded vent is commonly used on laboratory faucets and other applications with intermittent flow. It discharges overflow directly and should not be installed in areas where spillage could cause water damage.
Pipe Size | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Vent Type | Each | |
Chrome-Plated Brass Body | |||||||
|---|---|---|---|---|---|---|---|
NPT Male Inlet × NPT Female Outlet | |||||||
| 3/8 | 150 psi @ 140° F | 25 | 35° to 140° | 2 3/8" | Unthreaded | 0000000 | 0000000 |