4300
Catalog
Assembly / Installation
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
S17
Fig. S25 – O-Ring installation using the CORG
assembly tool
2.
Cleaning the tube end:
All oil and oxide build-up must be
removed from the tube end for at least the length of the braze
joint. Oil may be removed by using an oil-free solvent. Oxide
build-up may be removed by pickling or by lightly sanding
with an aluminum-free emery paper.
3.
Fixturing the parts for brazing:
Care should be taken so
the braze fixture allows the sleeve to settle and bottom on
the tube completely during heating. Since the Seal-Lok fitting
sleeve isdesigned for aslipfit, this shouldhappeneasily.Short
tubes can be brazed in the vertical position. On longer tubes,
the joint may need to be in the horizontal position, requiring
a slight nudge to seat the sleeve on the tube.
4.
Applying flux:
Apply proper
flux to
tube end (about 1½
sleeve lengths) and sleeve’s face and outside surface. Insert
appropriate braze ring in the sleeve and place the sleeve on
end of the tube.The flux helps protect the parts fromoxidizing
and promotes braze flow.
5.
Heating the part:
Apply heat uniformly to the joint by using
a multi-flame torch as shown in Fig. S22 or with an induction
braze unit. Proper brazing involves heating the assembly to
brazing temperature and flowing the filler metal through the
joint. Heat should be applied broadly and uniformly to the
tube as well as the Seal-Lok sleeve. Keep in mind that thicker
fitting and tubing sections take longer to heat. The entire
assembly should heat to brazing temperature at about the
same time. The braze alloy will always flow towards the area
of higher temperature. The pre-formed braze ring has been
placed inside the joint area—the last area to reach melting
temperature.Therefore, when you see the brazematerial flow
to the outside of the joint, you know the joint is complete. If
the sleeve does not settle, a slight pressure will cause the
sleeve to settle, completing the braze joint.
6.
Cleaning the brazed joint:
After stopping heat application,
allow about 10 seconds for the braze alloy to solidify. Then,
immerse the joint in hot water (approx. 140°F.). To make
cleaning easier, add braze cleaner to the hot water.This sud-
den cooling cracks the braze flux residue, making it easier to
remove. Any remaining residue can be removed by careful
wire brushing, making sure not to scratch the sealing surface
of the sleeve.
7.
Corrosion protection after brazing:
This is an extremely
important step following brazing and even more so following
the use of a braze cleaner. Braze cleaners available from
Parker are used to facilitate the removal of residual flux
after brazing, however are generally corrosive. The residue
left on the surface by the cleaner, especially on the I.D. of the
tube, can cause rusting in carbon steel tubes rather quickly,
if it is not neutralized. Therefore, it is important to neutralize
the cleaner residue after cleaning with a solution such as
Bernite 136
2
(
mix 4 ounces of Bernite 136 with one gallon
of water). If the brazed parts are not to be used soon after
brazing, a coating of rust inhibitors such as WD-40
3
or SP-
350
4
is recommended for the braze and heat affected area.
2 )
Products of Bernite Products, Inc. 84 New York, Westbury, NY 11500
(516) 338-4646.
3 )
A product of WD-40 Company, San Diego, CA 92220.
4 )
A product of CRC Chemicals, USA, Warminister, PA 18974 (215) 674-4300
Inspection of Brazing
Inspect the braze for a fillet all the way around the tube at the
far end (small diameter) of the sleeve.
Caution:
If there are gaps in the fillet, the joint may not be sound.
In this case, rebrazing is recommended.Remove the sleeve and
rebraze a new one in its place.
Fillet all the way
around the tube
No braze alloy overrun
on sealing surface
Fig. S24 – Brazed fitting
Inspect the sealing surface. There should be no braze alloy
overrun or build-up on this surface. If there is build-up, remove it
with emery paper, being careful not to scratch the seal surface.
If this is not possible, remove the old sleeve and rebraze a new
one in its place.
Final Installation
The following steps are required for final installation of the
Seal-Lok fitting:
1.
Ensure that the seal is properly installed in the groove of the
face seal. Parker provides Seal-Lok fittings with pre-installed
trap seals on the grove of the face seal. However, if the seal
is being replaced, standard round O-Ring face seal O-rings
can be found on page N4, in section N. Since Seal-Lok
is machined with the Captive O-ring Groove (CORG), it is
recommended that a CORG assembly tool be utilized, as
shown in Fig. S25. To properly use the assembly tool, follow
these steps
•
Position the O-ring inside the CORG assembly tool against
the pusher.
•
Position the tool over the Seal-Lok tube end until the end is
bottomed in the tool.
•
Push the plunger of the tool until the O-ring is inserted and
seated into the groove.
Seal-Lok Assembly