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Pressure Relief Valves

187 Zero-Leak PRI® Pressure Relief Valve

This direct-acting valve is ideally suited for low pressure hydraulic applications where a safety relief valve with extremely low leakage is needed to seal the system when closed. The valve’s fast opening response helps to prevent system damage from pressure spikes. Minimum cracking pressures are available from 20-100 psid.

Key Product Facts
  • Zero Leak Relief Valve
  • Diameter:0.187 inches
  • Full Open Lohm Rate:750 Lohms max
  • Nominal System Pressure:Up to 3000 psi
  • Cracking Pressure Range:20 to 100 psi

Product Information

General Performance
Characteristic Specification
Leakage at Minimum Cracking Pressure 0 Drops in a 1 Minute Test
Leakage at Minimum Shutoff Pressure 0 Drops in a 1 Minute Test
Nominal Weight 1.5 grams
Test Fluid MIL-PRF-83282 at 85°F
Materials
PART MATERIAL SPECIFICATION
Body 15-5PH CRES AMS 5659
Poppet 303 CRES QQ-S-763C
Spring 17-7PH CRES AMS 5678
Optional Shims 300 Series CRES ASTM A 666
Pin 17-4PH CRES AMS 5643
Elastomeric Seat (Option 1) Flourocarbon AMS-R-83485 or AMS-R-83248
Elastomeric Seat (Option 2) EPDM AMS-R-83285
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
SEAT MATERIAL
PART NUMBER
FLOW DIRECTION
SEAT MATERIAL
MINIMUM CRACKING PRESSURE (psid) FLOW POINT LOHM RATE FLOW POINT AT (psid) FULLY OPEN LOHM RATE MINIMUM SHUT-OFF PRESSURE (psid) Request Information
PSFA1870020L Forward Fluorocarbon 20 2500 Maximum 40 750 Maximum 16 Request
PSFA1870040L Forward Fluorocarbon 40 2500 Maximum 80 750 Maximum 32 Request
PSFA1870060L Forward Fluorocarbon 60 2500 Maximum 105 750 Maximum 48 Request
PSFA1870080L Forward Fluorocarbon 80 2500 Maximum 140 750 Maximum 64 Request
PSFA1870100L Forward Fluorocarbon 100 2500 Maximum 175 750 Maximum 80 Request
PSFA1871020L Forward EPDM 20 2500 Maximum 40 750 Maximum 16 Request
PSFA1871040L Forward EPDM 40 2500 Maximum 80 750 Maximum 32 Request
PSFA1871060L Forward EPDM 60 2500 Maximum 105 750 Maximum 48 Request
PSFA1871080L Forward EPDM 80 2500 Maximum 140 750 Maximum 64 Request
PSFA1871100L Forward EPDM 100 2500 Maximum 175 750 Maximum 80 Request
PSRA1870020L Reverse Fluorocarbon 20 2500 Maximum 40 750 Maximum 16 Request
PSRA1870040L Reverse Fluorocarbon 40 2500 Maximum 80 750 Maximum 32 Request
PSRA1870060L Reverse Fluorocarbon 60 2500 Maximum 105 750 Maximum 48 Request
PSRA1870080L Reverse Fluorocarbon 80 2500 Maximum 140 750 Maximum 64 Request
PSRA1870100L Reverse Fluorocarbon 100 2500 Maximum 175 750 Maximum 80 Request
PSRA1871020L Reverse EPDM 20 2500 Maximum 40 750 Maximum 16 Request
PSRA1871040L Reverse EPDM 40 2500 Maximum 80 750 Maximum 32 Request
PSRA1871060L Reverse EPDM 60 2500 Maximum 105 750 Maximum 48 Request
PSRA1871080L Reverse EPDM 80 2500 Maximum 140 750 Maximum 64 Request
PSRA1871100L Reverse EPDM 100 2500 Maximum 175 750 Maximum 80 Request
Clear Filters

Installation & Accessories

Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CUTA1870110C Installation / Extraction Tool Set
CSFA1870003A Replacement Pin

CAD Envelopes

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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.