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This valve combines the function of a reverse flow pressure relief valve in parallel with that of a check valve with free flow in the forward direction – all into in one easy-to-install insert. The relief valve function features a rugged tungsten carbide ball and a 440C seat for durability and long life. The remaining components are constructed entirely of stainless steel. The 281 PRI/Check Valve is available with or without integral safety screens in a range of 15 different relief flow cracking pressures for system pressures up to 5000 psi.
| Characteristic | Specification |
|---|---|
| Relief Flow Direction: Leakage at Minimum Cracking Pressure |
10 drops/minute maximum |
| Relief Flow Direction: Leakage at Minimum Shutoff Pressure |
10 drops/minute maximum |
| Free Flow Direction: Cracking Pressure |
5 ± 3 psid |
| Nominal System Pressure | up to 5000 psi |
| System Peak Pressure | 6750 psi maximum |
| Nominal Weight, Screened | 9.0 grams |
| Nominal Weight, Unscreened | 8.0 grams |
| Screen Hole Size | 0.008" Nominal |
| PART | MATERIAL | SPECIFICATION |
|---|---|---|
| Shuttle Plate | 303 CRES | QQ-S-763C |
| Seat | 440C CRES | AMS 5630 |
| Spring Seat | 303 CRES | QQ-S-763C |
| Springs | 17-7PH CRES | AMS 5678 |
| Body | 15-5PH CRES | AMS 5659 |
| Ball Follower | 303 CRES | QQ-S-763C |
| Tube | 17-4PH CRES or 304 CRES |
AMS 5643 AMS 5639 |
| Ball | Tungsten Carbide | - |
| Pin | 15-5PH CRES | AMS 5659 |
| Screens | 15-5PH CRES | AMS 5659 |
This table below contains the part numbers and technical specifications for this product. If you have specific questions, need a quote, or would like to request a handbook or drawing, click the red request button in the column on the far right.
| Part Number | Description |
|---|---|
| CUTA2810114C | Installation / Extraction Tool Set |
| SHBA2810003A | Replacement Pin |
From plugs to solenoid valves, there’s a vast array of products that The Lee Company can offer. If you’d like to discuss the best solution for your specific application or to learn more about our capabilities, use-cases, or quality standards, contact your local Lee sales engineer.
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The Lee Company has developed the Lohm Laws for defining and measuring resistance to fluid flow. The Lohm is defined such that 1 Lohm will flow 100 GPM of water with a pressure drop of 25 psi at a temperature of 80°F.
Always verify flow calculations by experiment.
*There are many parameters to consider when determining V-Factor. Click here for more information.
