Page 429 - 4300 Catalog Cover.pdf

4300 Catalog Assembly / Installation
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
T19
Table T16 – Seal-Lok Troubleshooting guide
Seal-Lok Assembly
CONDITION
Immediate leakage when
system is pressurized
Under-flanged assembly
Over-flanged assembly
Flange out-of-round
Cracked flange
Scored, pitted flange
Leakage at braze joint
Leakage at face-seal end
PROBABLE CAUSE(S)
• Improper tightening of joint
• Undersized tube diameter
resulting in tube slippage
during flanging
• Die gripping surface is worn or
dirty
• Sleeve is positioned incorrectly in
die
• Tubing was not cut properly
• Tube was not properly supported
during flanging
• Tubing is eccentric
• Tubing too hard
• Improper deburring and cleaning
of tube prior to flanging
• Flange pin not cleaned and
lubricated properly
• 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
• Misalignment or improper fit
• Damaged, pinched, improper, or
missing O-ring
• Extruded O-ring
• Damaged fitting
• Braze overflow on sealing surface
O-Ring Face Seal
Seal-Lok Troubleshooting Guide
RECOMMENDATION
• Check for O-ring damage and
re-tighten connection to the
recommended torque value
• Verify that the O.D. is correct; if
undersized, replace tube.
• Inspect die gripping surface; if clogged or
excessively worn, clean or replace.
• Check for proper positioning of sleeve in die;
if over-flanged, replace tubing
• 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
• Replace tubing using recommended
quality tube
• Replace flange using proper deburring and
cleaning recommendations
• Keep flanging pin clean and working surfaces
well lubricated.
• 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.
• 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 align-
ment and pressure surges exceeding rated
pressure of fitting; tighten the nut to recom-
mended torque or replace fitting if threads or
sealing surface is grossly damaged.
• Remove and replace sleeve which has braze
overflow on its sealing surface.
Dimensions and pressures for reference only, subject to change.