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Pressure Relief Valves

375 High Pressure PRI® Relief Valve

This direct-acting valve is ideally suited for high pressure hydraulic applications (up to 5000 psi) where a fast opening safety relief valve is needed to prevent system damage from pressure spikes. Minimum cracking pressures are available from 3000-5400 psid. An integral safety screen is available for added protection.

Key Product Facts
  • High Pressure Relief Valve
  • Diameter:0.375 inches
  • Full Open Lohm Rate:400 Lohms max
  • Nominal System Pressure:Up to 5000 psi
  • Cracking Pressure Range:3000 to 5400 psi

Product Information

General Performance
Characteristic Specification
Leakage at Minimum Cracking Pressure 2 mL / Minute Maximum
Leakage at Minimum Shutoff Pressure: 2 mL / Minute Maximum
Restriction at Minimum Recommended Valve Lift 1500 Lohms
Nominal System Pressure up to 5000 psi
System Peak Pressure 6750 psi Maximum
Nominal Weight 20 grams
Test Fluid MIL-PRF-83282 at 85°F
Materials
PART MATERIAL SPECIFICATION
Body 304 CRES AMS 5639
Pin 17-4PH CRES AMS 5643
Poppet 304 CRES AMS 5639
Seat 440C CRES AMS 5630
Spring 17-7PH CRES AMS 5678
Ball Tungsten Carbide -
Retainer 15-5PH CRES AMS 5659
Tube 13-8 MO CRES AMS 5629
Orifice Plate 304 CRES AMS 5639
Shim 17-7PH CRES AMS 5529
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 (gpm) FLOW POINT AT (psid) MINIMUM SHUT-OFF PRESSURE (psid) Request Information
PHFA3751300D Forward 3000 400 3.7 3850 2850 Request
PHFA3751320D Forward 3200 400 3.8 4050 3000 Request
PHFA3751340D Forward 3400 400 3.9 4250 3200 Request
PHFA3751420D Forward 4200 400 4 5250 4000 Request
PHFA3751440D Forward 4400 400 4.1 5400 4200 Request
PHFA3751520D Forward 5200 400 4.9 6550 5000 Request
PHFA3751540D Forward 5400 400 5 6750 5200 Request
PHRA3751300D Reverse 3000 400 3.7 3850 2850 Request
PHRA3751320D Reverse 3200 400 3.8 4050 3000 Request
PHRA3751340D Reverse 3400 400 3.9 4250 3200 Request
PHRA3751420D Reverse 4200 400 4 5250 4000 Request
PHRA3751440D Reverse 4400 400 4.1 5400 4200 Request
PHRA3751520D Reverse 5200 400 4.9 6550 5000 Request
PHRA3751540D Reverse 5400 400 5 6750 5200 Request
Clear Filters
Performance on MIL-PRF-83282 at 85°F

Installation & Accessories

Installation & Manufacturing Tools
Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CUTA3750514C Installation / Extraction Tool Set
PHRA3750003A Replacement Pin

CAD Envelopes

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Questions?

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.