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Check Valves

250 Pilot-Operated Check Valve

This miniature, pilot-operated check valve is only 0.25 inches in diameter and 1.25 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:0.25 inches
  • Lohm Rate:300 Lohms max
  • Operating Pressures:Up to 3000 psi
  • Leakage:1 drop / hour at 3000 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 300 Lohms Maximum
Nominal System Pressure Up to 5000 psi
Nominal Weight 7 grams
Test Fluid MIL-PRF-83282 at 85°F
Materials
PART MATERIAL SPECIFICATION
Body 304 CRES AMS 5639
Springs 17-7PH CRES AMS 5678
Poppet 15-5PH CRES AMS 5659
Pilot Piston 13-8MO CRES AMS 5629
Pin 17-4PH CRES AMS 5643
Piston Seal Teflon® AMS 3656
Compression Seal Polyamide - Imide AMS 3670/1
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 SEAL MATERIAL FLOW DIRECTION Request Information
CPFA2507105A 5 ± 3 3:1 300 Lohms Maximim Polyimide Forward Request
CPRA2507105A 5 ± 3 3:1 300 Lohms Maximim Polyimide Reverse Request
CPFA2507005A 5 ± 3 3:1 300 Lohms Maximim Polyamide - Imide Forward Request
CPRA2507005A 5 ± 3 3:1 300 Lohms Maximim Polyamide - Imide Reverse Request

Installation & Accessories

Replacement Parts & Accessories
PART NUMBER DESCRIPTION
CUTX0503050B Installation / Extraction Tool Set
CKFA2500005A Replacement Pin
CPRA2500009A Replacement Compression Seal

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.