Close Menu
Pressure Relief Valves

281 NACE Compliant High Pressure PRI® Relief Valve

This high speed, high pressure, and direct-acting valve is constructed entirely of corrosion-resistant materials that are compliant with NACE specification MR0175/ISO 15156. Minimum cracking pressures are available from 3000-5900 psid. An integral safety screen is available for added protection.

Key Product Facts
  • NACE Compliant High Pressure Relief Valve
  • Diameter:0.281 inches
  • Full Open Lohm Rate:1500 Lohms max
  • Nominal System Pressure:Up to 5000 psi
  • Cracking Pressure Range:3000 to 5900 psi

Product Information

General Performance
Characteristic Specification
Leakage at Minimum Cracking Pressure 1 mL / Minute Maximum
Leakage at Shutoff 1 mL / Minute Maximum
Nominal System Pressure up to 5000 psi
System Peak Pressure 7500 psi Maximum
Screen Hole Size 0.004 inches Nominal
Test Fluid MIL-PRF-83282 at 85°F
Materials
PART MATERIAL
Body MP35N
Tube MP35N
Spring Seat MP35N
Pin MP35N
Ball MP35N
Ball Follower MP35N
Spring MP35N or Elgiloy®
Screen Assembly (Screened Version Only) 316L CRES
Braze (Screened Version Only) -
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
PHFA2817300D Forward 3000 1500 0.9 3600 2850 Request
PHFA2817320D Forward 3200 1500 0.9 3850 3000 Request
PHFA2817340D Forward 3400 1500 0.95 4050 3200 Request
PHFA2817420D Forward 4200 1500 1 4750 3700 Request
PHFA2817450D Forward 4500 1500 1 5100 4000 Request
PHFA2817470D Forward 4700 1500 1.1 5300 4200 Request
PHFA2817520D Forward 5200 1500 1.1 5800 4550 Request
PHFA2817570D Forward 5700 1500 1.2 6350 5000 Request
PHFA2817590D Forward 5900 1500 1.2 6600 5200 Request
PHRA2817300D Reverse 3000 1500 0.9 3600 2850 Request
PHRA2817320D Reverse 3200 1500 0.9 3850 3000 Request
PHRA2817340D Reverse 3400 1500 0.95 4050 3200 Request
PHRA2817420D Reverse 4200 1500 1 4750 3700 Request
PHRA2817450D Reverse 4500 1500 1 5100 4000 Request
PHRA2817470D Reverse 4700 1500 1.1 5300 4200 Request
PHRA2817520D Reverse 5200 1500 1.1 5800 4550 Request
PHRA2817570D Reverse 5700 1500 1.2 6350 5000 Request
PHRA2817590D Reverse 5900 1500 1.2 6600 5200 Request
Clear Filters
Performance on MIL-PRF-83282 at 85°F

Installation & Accessories

Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CUTA2810114C Installation / Extraction Tool Set
PRRX0549720B Replacement Pin
Get in touch

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.