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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.
Steel Body—Spring-Loaded Piston
- 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 |
Steel Body—Spring-Loaded Ball
- 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 |
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.
Steel Body—Spring-Loaded Piston
- 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 |
Steel Body—Spring-Loaded Ball
- 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 |
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.
Valves with a poppet have internal components that can handle any flow rates. The higher the flow rate of the hydraulic fluid coming into the valve, the lower the pressure the fluid is as it leaves the valve.
NPTF (Dryseal) threads are compatible with NPT threads.
UN/UNF (SAE Straight) thread connections have straight threads and are also known as O-ring Boss fittings.
For technical drawings and 3-D models, click on a part number.
NPTF Female Inlet × NPTF Female Outlet—Ball Check Valve
NPTF — NPTF (Female)
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 | |||||||||||||
| 1/8 | 02 | 1/8 | 02 | 1.5 | 0.23 | 5,000 | 2.5 | 1 1/2" | 11/16" | Any Position | -15° to 400° | 0000000 | 000000 |
| 1/4 | 04 | 1/4 | 04 | 3 | 0.54 | 5,000 | 2.5 | 2" | 7/8" | Any Position | -15° to 400° | 0000000 | 00000 |
| 1/4 | 04 | 1/4 | 04 | 6 | 1.47 | 5,000 | 2.5 | 2" | 3/4" | Any Position | -30° to 200° | 0000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 5 | 0.83 | 5,000 | 2.5 | 2 1/4" | 1 1/16" | Any Position | -15° to 400° | 0000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 10 | 3.3 | 5,000 | 2.5 | 2 1/2" | 1" | Any Position | -30° to 200° | 0000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 8 | 1.47 | 5,000 | 2.5 | 2 3/4" | 1 5/16" | Any Position | -15° to 400° | 0000000 | 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° | 0000000 | 00000 |
| 3/4 | 12 | 3/4 | 12 | 12 | 1.9 | 5,000 | 2.5 | 3" | 1 5/8" | Any Position | -15° to 400° | 0000000 | 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° | 0000000 | 00000 |
NPTF Male Inlet × NPTF Male Outlet—Ball Check Valve
NPTF — NPTF (Male)
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 | Seal Material | Port-to-Port Lg. | Hex Wd. | Mounting Orientation | Temp. Range, °F | Each | |
Steel Body | ||||||||||||||
| 1/4 | 04 | 1/4 | 04 | 2.5 | 0.56 | 3,000 | 2.5 | __ | 1 3/8" | 5/8" | Any Position | -30° to 190° | 00000000 | 000000 |
| 1/4 | 04 | 1/4 | 04 | 2.5 | 0.56 | 3,000 | 2.5 | Buna-N Rubber | 1 3/8" | 5/8" | Any Position | -30° to 190° | 00000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 6 | 1.31 | 3,000 | 2.5 | __ | 1 5/8" | 3/4" | Any Position | -30° to 190° | 00000000 | 00000 |
| 3/8 | 06 | 3/8 | 06 | 6 | 1.31 | 3,000 | 2.5 | Buna-N Rubber | 1 5/8" | 3/4" | Any Position | -30° to 190° | 00000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 10 | 2.71 | 3,000 | 2.5 | __ | 2 1/8" | 7/8" | Any Position | -30° to 190° | 00000000 | 00000 |
| 1/2 | 08 | 1/2 | 08 | 10 | 2.71 | 3,000 | 2.5 | Buna-N Rubber | 2 1/8" | 7/8" | Any Position | -30° to 190° | 00000000 | 00000 |
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 |
BSPP Female Inlet × BSPP 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 |
UN/UNF (SAE Straight) Male Inlet × UN/UNF (JIC) Male Outlet—Poppet Check Valve
UN/UNF (SAE Straight) — UN/UNF (JIC)
Inlet Connection | Outlet Connection | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Dash Size | Thread Size | Dash Size | Flared Angle | Max. Flow Rate | Flow Coefficient (Cv) | Max. Pressure, psi | Min. Opening Pressure, psi | Seal Material | Port-to-Port Lg. | Hex Wd. | Mounting Orientation | Temp. Range, °F | Each | |
Steel Body | |||||||||||||||
| 7/16"-20 | 04 | 7/16"-20 | 04 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 1/4" | 9/16" | Any Position | -40° to 250° | 0000000 | 000000 |
| 9/16"-18 | 06 | 9/16"-18 | 06 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 1/4" | 3/4" | Any Position | -40° to 250° | 0000000 | 00000 |
| 3/4"-16 | 08 | 3/4"-16 | 08 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 5/8" | 7/8" | Any Position | -40° to 250° | 0000000 | 00000 |
| 7/8"-14 | 10 | 7/8"-14 | 10 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 7/8" | 1" | Any Position | -40° to 250° | 0000000 | 000000 |
| 1 1/16"-12 | 12 | 1 1/16"-12 | 12 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 2 1/8" | 1 1/4" | Any Position | -40° to 250° | 0000000 | 000000 |
| 1 5/16"-12 | 16 | 1 5/16"-12 | 16 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 2 1/2" | 1 1/2" | Any Position | -40° to 250° | 0000000 | 000000 |
UN/UNF (JIC) Male Inlet × UN/UNF (SAE Straight) Male Outlet—Poppet Check Valve
UN/UNF (JIC) — UN/UNF (SAE Straight)
Inlet Connection | Outlet Connection | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Dash Size | Flared Angle | Thread Size | Dash Size | Max. Flow Rate | Flow Coefficient (Cv) | Max. Pressure, psi | Min. Opening Pressure, psi | Seal Material | Port-to-Port Lg. | Hex Wd. | Mounting Orientation | Temp. Range, °F | Each | |
Steel Body | |||||||||||||||
| 7/16"-20 | 04 | 37° | 7/16"-20 | 04 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 1/4" | 9/16" | Any Position | -40° to 250° | 0000000 | 000000 |
| 9/16"-18 | 06 | 37° | 9/16"-18 | 06 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 1/4" | 3/4" | Any Position | -40° to 250° | 0000000 | 00000 |
| 3/4"-16 | 08 | 37° | 3/4"-16 | 08 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 5/8" | 7/8" | Any Position | -40° to 250° | 0000000 | 00000 |
| 7/8"-14 | 10 | 37° | 7/8"-14 | 10 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 7/8" | 1" | Any Position | -40° to 250° | 0000000 | 000000 |
| 1 1/16"-12 | 12 | 37° | 1 1/16"-12 | 12 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 2 1/8" | 1 1/4" | Any Position | -40° to 250° | 0000000 | 000000 |
| 1 5/16"-12 | 16 | 37° | 1 5/16"-12 | 16 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 2 1/2" | 1 1/2" | Any Position | -40° to 250° | 0000000 | 000000 |
UN/UNF (JIC) Male Inlet × UN/UNF (JIC) Male Outlet—Poppet Check Valve
UN/UNF (JIC) — UN/UNF (JIC)
Inlet Connection | Outlet Connection | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Dash Size | Flared Angle | Thread Size | Dash Size | Flared Angle | Max. Flow Rate | Flow Coefficient (Cv) | Max. Pressure, psi | Min. Opening Pressure, psi | Seal Material | Port-to-Port Lg. | Hex Wd. | Mounting Orientation | Temp. Range, °F | Each | |
Steel Body | ||||||||||||||||
| 7/16"-20 | 04 | 37° | 7/16"-20 | 04 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 1/2" | 9/16" | Any Position | -40° to 250° | 0000000 | 000000 |
| 9/16"-18 | 06 | 37° | 9/16"-18 | 06 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 1/2" | 3/4" | Any Position | -40° to 250° | 0000000 | 00000 |
| 3/4"-16 | 08 | 37° | 3/4"-16 | 08 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 7/8" | 7/8" | Any Position | -40° to 250° | 0000000 | 00000 |
| 7/8"-14 | 10 | 37° | 7/8"-14 | 10 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 2" | 1" | Any Position | -40° to 250° | 0000000 | 000000 |
| 1 1/16"-12 | 12 | 37° | 1 1/16"-12 | 12 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 2 1/2" | 1 1/4" | Any Position | -40° to 250° | 0000000 | 000000 |
| 1 5/16"-12 | 16 | 37° | 1 5/16"-12 | 16 | 37° | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 2 5/8" | 1 1/2" | Any Position | -40° to 250° | 0000000 | 000000 |