4300
Catalog
Assembly / Installation
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
S19
Table S15 – 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.