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Pressure Relief Valves

281 Zero-Leak PRI® Pressure Relief Valve

This direct-acting valve is ideally suited for hydraulic applications where a safety relief valve with extremely low leakage is needed to seal the system when closed. The fast opening response helps the valve prevent system damage from pressure spikes. Minimum cracking pressures are available from 800-4700 psid.

Key Product Facts
  • Zero Leak Thermal Relief Valve
  • Diameter:0.281 inches
  • Full Open Lohm Rate:100,000 Lohms max
  • Nominal System Pressure:Up to 4000 psi
  • Cracking Pressure Range:800 to 4700 psi

Product Information

General Performance
Characteristic Specification
Leakage at Minimum Cracking Pressure: 0 Drops in a 1 Minute Test; 1 Drop / Hour Maximum
Leakage at Minimum Shutoff Pressure 0 Drops in a 1 Minute Test; 1 Drop / Hour Maximum
Nominal System Pressure 4000 psi Maximum
System Peak Pressure 5400 psi Maximum
Screen Hole Size 0.004 inches Nominal
Test Fluid MIL-PRF-83282 at 85°F
Materials
PART MATERIAL SPECIFICATION
Body 15-5PH CRES AMS 5659
Pin 15-5PH CRES AMS 5659
Poppet 440C CRES AMS 5630
Seal POLYMER -
Poppet Guide 303 CRES QQ-S-763C
Retainers 303 CRES QQ-S-763C
Spring Guide 303 CRES QQ-S-763C
Spring Seat 303 CRES QQ-S-763C
Spring 17-7PH CRES AMS 5678
Screen 304L CRES ASTM A 666
Braze - AMS 4774
Finish: All CRES parts passivated.
Pins are prewaxed. Do not degrease. Do not lubricate.
Flow Curve
Cross Section Views
Dimensional View
Installation Hole Details

Part Numbers & Specifications

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.

Image Specifications
Flow Curve
Part Numbers & Specifications
Filter Part Numbers
FLOW DIRECTION
PART NUMBER
FLOW DIRECTION
MINIMUM CRACKING PRESSURE (psid) FLOW POINT LOHM RATE FLOW POINT MINIMUM FLOW (mL / minute) FLOW POINT AT (psid) MINIMUM SHUT-OFF PRESSURE (psid) Request Information
PSFA2813800L Forward 800 100,000 25 930 660 Request
PSFA2813130D Forward 1300 100,000 33 1500 1100 Request
PSFA2813250D Forward 2500 100,000 45 3000 2100 Request
PSFA2813350D Forward 3500 100,000 55 4050 3100 Request
PSFA2813470D Forward 4700 100,000 63 5400 4100 Request
PSRA2813800L Reverse 800 100,000 25 930 660 Request
PSRA2813130D Reverse 1300 100,000 33 1500 1100 Request
PSRA2813250D Reverse 2500 100,000 45 3000 2100 Request
PSRA2813350D Reverse 3500 100,000 55 4050 3100 Request
PSRA2813470D Reverse 4700 100,000 63 5400 4100 Request
Clear Filters
Performance on MIL-PRF-83282 at 85°F

Installation & Accessories

Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CUTA2810114C Installation / Extraction Tool Set
SHBA2810003A Replacement Pin
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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.