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About Backflow-Prevention Valves
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Threaded Check Valves
Female Inlet × Female Outlet
These valves open to allow flow in one direction and close when flow stops or reverses.
Nickel-plated brass valves are more corrosion resistant than plain brass or bronze 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.
Connectors, BSPT Female Inlet × BSPT Female Outlet
- For Use With: See table
- Spring material: See table
- Seal Material: See table
| Pipe Size  | Flow Coefficient (Cv) | Max. Pressure | Max. Steam Pressure | Min. Opening Pressure, psi | Temperature Range, °F | Spring Material | Seal Material | End-to-End Lg. | For Use With | Each | |
Brass Body—303 Stainless Steel Spring-Loaded Piston | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/8 | 2 | 400 psi @ 70° F | 125 psi @ 350° F | 2 | 35° to 350° | 302 Stainless Steel | 303 Stainless Steel | 2 5/8" | Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon | 00000000 | 000000 |
| 1/2 | 3 | 400 psi @ 70° F | 125 psi @ 350° F | 2 | 35° to 350° | 302 Stainless Steel | 303 Stainless Steel | 2 11/16" | Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon | 00000000 | 00000 |
| 3/4 | 6 | 400 psi @ 70° F | 125 psi @ 350° F | 2 | 35° to 350° | 302 Stainless Steel | 303 Stainless Steel | 3 5/16" | Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon | 00000000 | 00000 |
| 1 | 12 | 400 psi @ 70° F | 125 psi @ 350° F | 2 | 35° to 350° | 302 Stainless Steel | 303 Stainless Steel | 3 11/16" | Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon | 00000000 | 00000 |
| 1 1/4 | 22 | 400 psi @ 70° F | 125 psi @ 350° F | 2 | 35° to 350° | 302 Stainless Steel | 303 Stainless Steel | 4 9/16" | Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon | 00000000 | 00000 |
Brass Body—304 Stainless Steel Spring-Loaded Piston | |||||||||||
| 1 1/2 | 35 | 400 psi @ 70° F | 125 psi @ 350° F | 2 | 35° to 350° | 302 Stainless Steel | 304 Stainless Steel | 4 7/8" | Air; Argon; Helium; Krypton; Neon; Oil; Steam; Water; Xenon | 00000000 | 000000 |
Backflow-Prevention Inline Hydraulic Valves
Also known as check valves, these 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.
BSPT Female Inlet × BSPT Female Outlet—Ball Check Valve
BSPT — BSPT and BSPP — BSPP
Inlet Connection | Outlet Connection | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Pipe Size | Dash Size | Max. Flow Rate, gpm | Flow Coefficient (Cv) | Max. Pressure, psi | Min. Opening Pressure, psi | Port-to-Port Lg. | Hex Wd. | Mounting Orientation | Temp. Range, °F | Each | |
Steel Body | |||||||||||||
| 1/4 | 04 | 1/4 | 04 | 6 | 1.47 | 5,000 | 2.5 | 2" | 3/4" | Any Position | -30° to 200° | 000000 | 000000 |
| 3/8 | 06 | 3/8 | 06 | 10 | 3.3 | 5,000 | 2.5 | 2 1/2" | 1" | Any Position | -30° to 200° | 000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 12 | 3.6 | 5,000 | 2.5 | 2 7/8" | 1 1/8" | Any Position | -30° to 200° | 000000 | 00000 |
| 3/4 | 12 | 3/4 | 12 | 20 | 5.41 | 5,000 | 2.5 | 3 1/4" | 1 3/8" | Any Position | -30° to 200° | 000000 | 00000 |