ORFS connection troubleshooting | Parker Seal-Lok




  • Immediate leakage when system is pressurized
  • Improper tightening of joint
  • Check for O-ring damage and
    re-tighten connection to the
    recommended torque value
  • Under-flanged assembly
  • Undersized tube diameter resulting in tube slippage during flanging
  • Die gripping surface is worn or
  • Verify that the O.D. is correct; if undersized, replace tube
  • Inspect die gripping surface; if clogged or excessively worn, clean or replace
  • Over-flanged assembly
  • Sleeve is positioned incorrectly in die
  • Check for proper positioning of sleeve in die; if over-flanged, replace tubing
  • Flange out-of-round
  • Tubing was not cut properly
  • Tube was not properly supported during flanging
  • Tubing is eccentric
  • Cut tubing within 90° ±1°
  • Support tubing so that tube end is perpendicular to tube stop during flanging
  • Replace with quality tubing
  • Replace out-of-round flanges
  • Cracked flange
  • Tubing is too hard
  • Replace tubing using recommended quality tube
  • Scored, pitted flange
  • Improper deburring and cleaning
    of tube prior to flanging
  • Flange pin not cleaned and
    lubricated properly
  • Replace flange using proper deburring and cleaning recommendations
  • Keep flanging pin clean and working surfaces well lubricated
  • Leakage at braze joint
  • Poor braze joint/improper joint clearance
  • Mixing of sleeve and tube material
  • Improper/inadequate flux, braze alloy overrun, or buildup on face
  • Improper/inadequate braze temperature
  • Flux and reheat the joint; remove and replace with new sleeve
  • Always use steel sleeves with steel tubing and stainless sleeves with stainless tubing
  • Apply flux liberally to sleeve and tube end prior to brazing
  • Use recommended flux, braze alloy and brazing temperature
  • Leakage at face-seal end
  • Misalignment or improper fit
  • Damaged, pinched, improper, or missing O-ring
  • Extruded O-ring
  • Damaged fitting
  • Braze overflow on sealing surface
  • Align tube end and connecting fitting properly before tightening tube nut, holding the flat face of the mating fitting against O-ring while tightening
  • Replace O-ring, properly installing it in the face seal groove
  • Replace O-ring and check for proper alignment and pressure surges exceeding rated pressure of fitting
  • Tighten the nut to recommended torque or replace fitting if threads or sealing surface is grossly damaged
  • Remove and replace sleeve that has braze overflow on its sealing surface

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