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Pressure Relief Valves

375 HD PRI® High Stability Pressure Relief Valve

This direct-acting valve is designed for applications where stability is a must. Dual dampening chambers provide an extremely stable relief flow over various flow rates and pressure combinations. Minimum cracking pressures are available from 3000-4700 psid.

Key Product Facts
  • Safety 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 Shutoff 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 21 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 440C CRES AMS 5630
Seat 440C CRES AMS 5630
Spring 17-7PH CRES AMS 5678
Retainer 15-5PH CRES AMS 5659
Tube 13-8 MO CRES AMS 5629
Orifice Plate 304 CRES AMS 5639
Shim (Optional) 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
PBFA3750300D Forward 3000 400 3.7 3850 2850 Request
PBFA3750320D Forward 3200 400 3.8 4050 3000 Request
PBFA3750340D Forward 3400 400 3.9 4250 3200 Request
PBFA3750420D Forward 4200 400 4 5250 4000 Request
PBFA3750440D Forward 4400 400 4.1 5400 4200 Request
PBFA3750520D Forward 5200 400 4.9 6550 5000 Request
PBFA3750540D Forward 5400 400 5 6750 5200 Request
PBRA3750300D Reverse 3000 400 3.7 3850 2850 Request
PBRA3750320D Reverse 3200 400 3.8 4050 3000 Request
PBRA3750340D Reverse 3400 400 3.9 4250 3200 Request
PBRA3750420D Reverse 4200 400 4 5250 4000 Request
PBRA3750440D Reverse 4400 400 4.1 5400 4200 Request
PBRA3750520D Reverse 5200 400 4.9 6550 5000 Request
PBRA3750540D Reverse 5400 400 5 6750 5200 Request
Clear Filters
Performance on MIL-PRF-83282 at 85°F

Installation & Accessories

Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CUTA3752014C Installation / Extraction Tool Set
PHRA3750003A Replacement Pin
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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.