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Check Valves

250 Axial Flow Check Valve

This miniature check valve is only 0.25 inches in diameter and 0.78 inches in length. This valve features an economical ball-style design allowing free flow in one direction and preventing flow in the other direction. It is ideal for applications with flow rates up to 1.8 GPM. An integral safety screen is available for increased protection against contamination.

Key Product Facts
  • Ball-Style Check Valves
  • Diameter:0.25 inches
  • Lohm Rate:175 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 or 1 ± 0.5 psid
Maximum Leakage in Checked Direction at 5 psid 1 Drop / Minute
Maximum Leakage in Checked Direction at 1000-3000 psid 1 Drop / Hour
Lohm Rate at 20 psid and Greater Unscreened: 175 Lohms
Screened: 235 Lohms
Nominal System Pressure Up to 3000 psi
Nominal Weight Unscreened: 3.8 grams
Screened: 4.5 grams
Available Screen Hole Size 0.008 inches Nominal
Test Fluid MIL-PRF-83282 at 85°F
Body 303 CRES QQ-S-763C
Pin 303 CRES QQ-S-763C
Spring 17-7PH CRES AMS 5678
Ball 440C CRES AMS 5630
Ball Follower 303 CRES QQ-S-763C
Spring Seat 303 CRES QQ-S-763C
Cage 303 CRES QQ-S-763C
Screen (Screened Versions Only) 304L CRES ASTM A 666
Braze (Screened Versions Only) AMS 4774
Finish: All CRES parts passivated.
Pins are prewaxed. Do not degrease. Do not lubricate.
Flow Curves
Cross Section Views
Dimensional Views
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
CKFA2506005A 5 ± 3 175 Lohms Maximum - Forward Request
CKFA2501001A 1 ± 0.5 175 Lohms Maximum - Forward Request
CKRA2506005A 5 ± 3 175 Lohms Maximum - Reverse Request
CKRA2501001A 1 ± 0.5 175 Lohms Maximum - Reverse Request
CKFA2505005A 5 ± 3 235 Lohms Maximum 0.008 Forward Request
CKFA2505001A 1 ± 0.5 235 Lohms Maximum 0.008 Forward Request
CKRA2505005A 5 ± 3 235 Lohms Maximum 0.008 Reverse Request
CKRA2505001A 1 ± 0.5 235 Lohms Maximum 0.008 Reverse Request

Installation & Accessories

Replacement Parts & Accessories
CUTA2500106C Installation / Extraction Tool Set
CKFA2500003A Replacement Pin

CAD Envelopes

Get in touch


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.