About Backflow-Prevention Valves
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High-Performance Threaded Check Valves for Fuel
These heavy duty valves can withstand pressures up to 1,975 psi and temperatures up to 800° F. 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.
Spring-loaded ball check valves resist sticking and clogging better than spring-loaded piston check 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: Diesel Fuel, Natural Gas
- Piston Material: 420 Stainless Steel
- Spring Material: 304 Stainless Steel
- Seal Material: 304 Stainless Steel, Graphite
| Pipe Size  | Flow Coefficient (Cv) | Pressure Class | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Features | Each | |
NPT Female × NPT Female | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 1.53 | 800 | 1,975 psi @ 100° F | 32 | -20° to 800° | 3 1/8" | Removable Cap | 0000000 | 000000 |
| 3/4 | 2.69 | 800 | 1,975 psi @ 100° F | 34 | -20° to 800° | 3 5/8" | Removable Cap | 0000000 | 000000 |
| 1 | 5.08 | 800 | 1,975 psi @ 100° F | 45 | -20° to 800° | 4 3/8" | Removable Cap | 0000000 | 000000 |
| 1 1/4 | 8.96 | 800 | 1,975 psi @ 100° F | 45 | -20° to 800° | 4 3/4" | Removable Cap | 0000000 | 000000 |
| 1 1/2 | 14.09 | 800 | 1,975 psi @ 100° F | 63 | -20° to 800° | 6" | Removable Cap | 0000000 | 000000 |
| 2 | 22.34 | 800 | 1,975 psi @ 100° F | 80 | -20° to 800° | 6 1/2" | Removable Cap | 0000000 | 000000 |
- For Use With: Diesel Fuel, Natural Gas
- Ball Material: 304 Stainless Steel
- Spring Material: 304 Stainless Steel
- Seal Material: 304 Stainless Steel, Graphite
| Pipe Size | Flow Coefficient (Cv) | Pressure Class | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Features | Each | |
NPT Female × NPT Female | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 1.53 | 800 | 1,975 psi @ 100° F | 57 | -20° to 800° | 3 1/8" | Removable Cap | 0000000 | 0000000 |
| 3/4 | 2.69 | 800 | 1,975 psi @ 100° F | 57 | -20° to 800° | 3 5/8" | Removable Cap | 0000000 | 000000 |
| 1 | 5.08 | 800 | 1,975 psi @ 100° F | 107 | -20° to 800° | 4 3/8" | Removable Cap | 0000000 | 000000 |
| 1 1/4 | 8.96 | 800 | 1,975 psi @ 100° F | 267 | -20° to 800° | 4 3/4" | Removable Cap | 0000000 | 000000 |
| 1 1/2 | 14.1 | 800 | 1,975 psi @ 100° F | 527 | -20° to 800° | 6" | Removable Cap | 0000000 | 000000 |
| 2 | 22.34 | 800 | 1,975 psi @ 100° F | 527 | -20° to 800° | 6 13/16" | Removable Cap | 0000000 | 000000 |
Flange-Mount Check Valves for Oil and Fuel
- For Use With: Butane, Diesel Fuel, Fuel Oil, Gasoline, Kerosene, Natural Gas, Oil, Propane
- Disc Material: 316 Stainless Steel
- Seal Material: 316 Stainless Steel
Install these valves between ANSI flanges. ANSI flanges are sold separately. All valves open to allow flow in one direction and close when flow stops or reverses. Body is 316 stainless steel for excellent corrosion resistance.
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. | For Flange Class | Each | |
316 Stainless Steel Body | ||||||||
|---|---|---|---|---|---|---|---|---|
Flanged × Flanged | ||||||||
| 2 | 48 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 3/8" | 150, 300, 600 | 0000000 | 0000000 |
| 2 1/2 | 90 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 5/8" | 150, 300, 600 | 0000000 | 000000 |
| 3 | 171 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 7/8" | 150, 300, 600 | 0000000 | 000000 |
| 4 | 291 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 2 7/8" | 150, 300 | 0000000 | 000000 |
| 6 | 705 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 3 7/8" | 150, 300 | 0000000 | 00000000 |
| 8 | 1,795 | 275 psi @ 70° F | 1.25 | -20° to 1000° | 5" | 150, 300 | 0000000 | 00000000 |
Socket-Connect Check Valves for Oil and Fuel
Insert unthreaded pipe into the socket ends and weld to create a permanent, leak-tight connection. These heavy duty valves can withstand pressures up to 1,975 psi and temperatures up to 800° F. They open to allow flow in one direction and close when flow stops or reverses. A removable cap provides easy access to internal components for maintenance.
Spring-loaded ball check valves resist sticking and clogging better than spring-loaded piston check 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: Diesel Fuel, Gasoline, Natural Gas, Oil
- Piston Material: 420 Stainless Steel
- Spring Material: 304 Stainless Steel
- Seal Material: 304 Stainless Steel, Graphite
| Pipe Size | Flow Coefficient (Cv) | Pressure Class | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Features | Each | |
Socket Connect × Socket Connect | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 3/4 | 2.69 | 800 | 1,975 psi @ 100° F | 34 | -20° to 800° | 3 5/8" | Removable Cap | 0000000 | 0000000 |
| 1 | 5.08 | 800 | 1,975 psi @ 100° F | 45 | -20° to 800° | 4 3/8" | Removable Cap | 0000000 | 000000 |
| 2 | 22.34 | 800 | 1,975 psi @ 100° F | 80 | -20° to 800° | 6 13/16" | Removable Cap | 0000000 | 000000 |
- For Use With: Diesel Fuel, Natural Gas
- Ball Material: 304 Stainless Steel
- Spring Material: 304 Stainless Steel
- Seal Material: 304 Stainless Steel, Graphite
| Pipe Size | Flow Coefficient (Cv) | Pressure Class | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Features | Each | |
Socket Connect × Socket Connect | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 3/4 | 2.69 | 800 | 1,975 psi @ 100° F | 57 | -20° to 800° | 3 5/8" | Removable Cap | 0000000 | 0000000 |
| 1 | 5.08 | 800 | 1,975 psi @ 100° F | 107 | -20° to 800° | 4 3/8" | Removable Cap | 0000000 | 000000 |
| 2 | 22.34 | 800 | 1,975 psi @ 100° F | 527 | -20° to 800° | 6 13/16" | Removable Cap | 0000000 | 000000 |