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Pressure Relief Valves

375 Momentum PRI® Pressure Relief Valve

This direct-acting valve is ideally suited for hydraulic applications where a relief valve is needed to regulate the upstream pressure. Minimum cracking pressures are available from 50-500 psid.

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Key Product Facts
  • Safety Relief Valve
  • Diameter:0.375 inches
  • Full Open Lohm Rate:100 Lohms max
  • Nominal System Pressure:Up to 3000 psi
  • Cracking Pressure Range:50 to 500 psi
For More Information

Product Information

General Performance
Characteristic Specification
Leakage at Minimum Cracking Pressure 5 Drops / Minute Maximum
Leakage at Shutoff 20 Drops / Minute Maximum
Restriction at Minimum Recommended Valve Lift 500 Lohms Maximum
Nominal System Pressure up to 3000 psi
Nominal Weight 10.0 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 15-5PH CRES AMS 5659
Spring Seat 304 CRES AMS 5639
Spring 17-7PH CRES AMS 5678
Seat 440C CRES AMS 5630
Finish: All CRES parts passivated.
Pins are prewaxed. Do not degrease. Do not lubricate.
Flow Curve
Cross Section Views
Relief Flow Reverse Configuration
Dimensional View
This image is for reference only. All dimensions are in inches.
Installation Hole Details
This image is for reference only. All dimensions are in inches.

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
PRFA3756050L Forward 50 100 1.7 63 45 Request
PRFA3756080L Forward 80 100 2.1 100 72 Request
PRFA3756120L Forward 120 100 2.6 150 108 Request
PRFA3756200L Forward 200 100 3.4 250 180 Request
PRFA3756300L Forward 300 100 4.2 375 270 Request
PRFA3756400L Forward 400 100 4.8 500 360 Request
PRFA3756500L Forward 500 100 5.4 625 450 Request
PRRA3756050L Reverse 50 100 1.7 63 45 Request
PRRA3756080L Reverse 80 100 2.1 100 72 Request
PRRA3756120L Reverse 120 100 2.6 150 108 Request
PRRA3756200L Reverse 200 100 3.4 250 180 Request
PRRA3756300L Reverse 300 100 4.2 375 270 Request
PRRA3756400L Reverse 400 100 4.8 500 360 Request
PRRA3756500L Reverse 500 100 5.4 625 450 Request
Clear Filters
Performance on MIL-PRF-83282 at 85°F

Installation & Accessories

Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CUTA3750106C Installation / Extraction Tool Set (Forward Configurations)
CUTA3750214C Installation / Extraction Tool Set (Reverse Configurations)
CKFA3750003A Replacement Pin

CAD Envelopes

Resources

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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.

Lohms for Liquids Lohms for Gases