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Pressure Relief Valves

250 PRI® Pressure Relief Valve

This direct-acting valve is ideally suited for low flow (less than 0.31 GPM) hydraulic applications where a miniature, lightweight pressure relief valve is needed. Minimum cracking pressures are available from 80-3600 psid. An integral safety screen is available for added protection.

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Key Product Facts
  • Safety Relief Valve
  • Diameter:0.250 inches
  • Full Open Lohm Rate:4500 Lohms max
  • Nominal System Pressure:Up to 3000 psi
  • Cracking Pressure Range:80 to 3600 psi
For More Information

Product Information

General Performance
Characteristic Specification
Leakage at Minimum Cracking Pressure 2 mL / Minute Maximum
Leakage at Minimum Shutoff Pressure 2 mL / Minute Maximum
Nominal System Pressure Up to 3000 psi
System Peak Pressure 4100 psi Maximum
Screen Hole Size 0.008 inches Nominal
Screen Open Area 0.014 square inches Nominal
Test Fluid MIL-PRF-83282 at 85°F
Materials
PART MATERIAL SPECIFICATION
Body Front 304 CRES AMS 5639
Body Rear 304 CRES AMS 5639
Pin 17-4PH CRES AMS 5643
Poppet 15-5PH CRES AMS 5659
Tube 304 CRES AMS 5639
Spring Seat 304 CRES AMS 5639
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
Relief Flow Forward 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
PRFA2505080L Forward 80 4500 0.08 300 72 Request
PRFA2505500L Forward 500 4500 0.13 750 450 Request
PRFA2505100D Forward 1000 4500 0.19 1500 900 Request
PRFA2505120D Forward 1200 4500 0.2 1700 1080 Request
PRFA2505140D Forward 1400 4500 0.21 1900 1260 Request
PRFA2505220D Forward 2200 4500 0.25 2700 1980 Request
PRFA2505250D Forward 2500 4500 0.27 3000 2250 Request
PRFA2505300D Forward 3000 4500 0.29 3500 2700 Request
PRFA2505320D Forward 3200 4500 0.29 3700 2880 Request
PRFA2505340D Forward 3400 4500 0.3 3900 3060 Request
PRFA2505350D Forward 3500 4500 0.31 4000 3150 Request
PRFA2505360D Forward 3600 4500 0.31 4100 3240 Request
PRRA2505080L Reverse 80 4500 0.08 300 72 Request
PRRA2505500L Reverse 500 4500 0.13 750 450 Request
PRRA2505100D Reverse 1000 4500 0.19 1500 900 Request
PRRA2505120D Reverse 1200 4500 0.2 1700 1080 Request
PRRA2505140D Reverse 1400 4500 0.21 1900 1260 Request
PRRA2505220D Reverse 2200 4500 0.25 2700 1980 Request
PRRA2505250D Reverse 2500 4500 0.27 3000 2250 Request
PRRA2505300D Reverse 3000 4500 0.29 3500 2700 Request
PRRA2505320D Reverse 3200 4500 0.29 3700 2880 Request
PRRA2505340D Reverse 3400 4500 0.3 3900 3060 Request
PRRA2505350D Reverse 3500 4500 0.31 4000 3150 Request
PRRA2505360D Reverse 3600 4500 0.31 4100 3240 Request
Clear Filters
Performance on MIL-PRF-83282 at 85°F

Installation & Accessories

Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CUTA2500306C Installation / Extraction Tool Set
CKFA2500005A Replacement Pin

CAD Envelopes

CAD Envelope

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