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Check Valves

500 High Pressure, Pilot-Operated Check Valve

This high pressure, pilot-operated check valve is only 0.5 inches in diameter and 2.76 inches in length. The valve acts like a normal check valve until pressure is applied to the pilot port, at which point the valve allows flow in the direction that would normally be blocked.

Key Product Facts
  • Pilot-Operated Check Valves
  • Diameter:0.5 inches
  • Lohm Rate:60 Lohms max
  • Operating Pressures:Up to 5000 psi
  • Leakage:1 drop / hour at 5000 psi

Product Information

General Performance
Characteristic Specification
Cracking Pressure 5 ± 3 psid
Minimum Pilot Ratio 3:1
Maximum Leakage in Checked Direction at 5 psid 1 Drop / Minute
Maximum Leakage in Checked Direction at 1000-5000 psid 1 Drop / Hour
Pilot Piston Leakage 1 Drop / Minute Maximum at 5000 psid
Lohm Rate at 15 psid and Greater 60 Lohms Maximum
Nominal System Pressure Up to 5000 psi
Nominal Weight 49 grams
Test Fluid MIL-PRF-83282 at 85°F
Materials
PART MATERIAL SPECIFICATION
Body Front 304 CRES AMS 5639
Body Center 15-5PH CRES AMS 5659
Body Rear 304 CRES AMS 5639
Poppet 15-5PH CRES AMS 5659
Springs 17-7PH CRES AMS 5678
Pilot Piston 13-8MO CRES AMS 5629
Pin 15-5PH CRES AMS 5659
Compression Seal Polymer
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.

Part Numbers & Specifications
PART NUMBER CRACKING PRESSURE (psid) MIN PILOT RATIO PILOTED LOHM RATE FLOW DIRECTION Request Information
CPRA5007005A 5 +/- 3 3:1 60 Lohms Maximum Reverse Request
CPFA5007005A 5 +/- 3 3:1 60 Lohms Maximum Forward Request

Installation & Accessories

Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CUTA5000206C Installation / Extraction Tool Set
CHFA5000003A Replacement Pin
SVDA5000009A Replacement Compression Seal
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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.