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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.
UN/UNF (SAE Straight) thread connections have straight threads and are also known as O-ring Boss fittings.
UN/UNF (ORFS) threads are also known as O-ring face seal threads.
For technical drawings and 3-D models, click on a part number.
UN/UNF (SAE Straight) Male Inlet × UN/UNF (ORFS) Male Outlet—Poppet Check Valve
UN/UNF
(SAE Straight) —
UN/UNF (ORFS)
(SAE Straight) —
UN/UNF (ORFS)
Inlet Connection | Outlet Connection | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size  | Dash Size | 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 | 9/16"-18 | 04 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 1/8" | 5/8" | Any Position | -40° to 250° | 0000000 | 000000 |
| 9/16"-18 | 06 | 11/16"-16 | 06 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 1/8" | 3/4" | Any Position | -40° to 250° | 0000000 | 00000 |
| 3/4"-16 | 08 | 13/16"-16 | 08 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 3/8" | 7/8" | Any Position | -40° to 250° | 0000000 | 000000 |
| 7/8"-14 | 10 | 1"-14 | 10 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 5/8" | 1 1/8" | Any Position | -40° to 250° | 0000000 | 000000 |
| 1 1/16"-12 | 12 | 1 3/16"-12 | 12 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 7/8" | 1 1/4" | Any Position | -40° to 250° | 0000000 | 000000 |
| 1 5/16"-12 | 16 | 1 7/16"-12 | 16 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 2" | 1 1/2" | Any Position | -40° to 250° | 0000000 | 000000 |
UN/UNF (ORFS) Male Inlet × UN/UNF (SAE Straight) Male Outlet—Poppet Check Valve
UN/UNF (ORFS) — UN/UNF (SAE Straight)
Inlet Connection | Outlet Connection | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Dash Size | 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 | ||||||||||||||
| 9/16"-18 | 04 | 7/16"-20 | 04 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 1/8" | 5/8" | Any Position | -40° to 250° | 0000000 | 000000 |
| 11/16"-16 | 06 | 9/16"-18 | 06 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 1/8" | 3/4" | Any Position | -40° to 250° | 0000000 | 00000 |
| 13/16"-16 | 08 | 3/4"-16 | 08 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 3/8" | 7/8" | Any Position | -40° to 250° | 0000000 | 000000 |
| 1"-14 | 10 | 7/8"-14 | 10 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 5/8" | 1 1/8" | Any Position | -40° to 250° | 0000000 | 000000 |
| 1 3/16"-12 | 12 | 1 1/16"-12 | 12 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 1 7/8" | 1 1/4" | Any Position | -40° to 250° | 0000000 | 000000 |
| 1 7/16"-12 | 16 | 1 5/16"-12 | 16 | Not Rated | Not Rated | 5,000 | 5 | Buna-N Rubber | 2" | 1 1/2" | Any Position | -40° to 250° | 0000000 | 000000 |