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Pressure Relief Valves

250 High Pressure TRI Thermal Pressure Relief Valve

This direct-acting valve has been optimized to relieve small flows caused by thermal expansion of a trapped volume of high pressure fluid. Minimum cracking pressures are available from 3500-5800 psid. This valve includes a 10 micron filter.

Key Product Facts
  • High Pressure Thermal Relief Valve
  • Diameter:0.250 inches
  • Full Open Lohm Rate:136,000 Lohms max
  • Nominal System Pressure:Up to 5000 psi
  • Cracking Pressure Range:3500 to 5800 psi

Product Information

General Performance
Characteristic Specification
Leakage at Minimum Cracking Pressure 3 Drops / Minute Maximum
Leakage at Shutoff 3 Drops / Minute Maximum (after a 2 minute wait)
Integral Filtration 10 micron Nominal
Nominal System Pressure up to 5000 psi
System Peak Pressure 7500 psi Maximum
Nominal Weight 4.5 grams
Test Fluid MIL-PRF-83282 at 85°F
Materials
PART MATERIAL SPECIFICATION
Body 304 CRES AMS 5639
Pin 17-4PH CRES AMS 5678
Seat 440C CRES AMS 5630
Ball Tungsten Carbide -
Spring Seat 303 CRES QQ-S-763C
Tube 304 CRES AMS 5639
Ball Follower 303 CRES QQ-S-763C
Spring 17-7PH CRES AMS 5678
Filter 316 CRES -
Finish: All CRES parts passivated.
Pins are prewaxed. Do not degrease. Do not lubricate.
Flow Curve
Cross Section View
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
PART NUMBER 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
PHTA2501350D 3500 105,000 50 4050 3200 Request
PHTA2501470D 4700 122,000 50 5300 4200 Request
PHTA2501580D 5800 136,000 50 6650 5200 Request
Performance on MIL-PRF-83282 at 85°F

Installation & Accessories

Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CUTA2500406C Installation / Extraction Tool Set
CHFA2500003A 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.