SMC Networks AKP Series Operation Manual page 9

Precautions for One-Touch Tube Fittings
Piping
Caution
(1) Connection and disconnection of tube from
one-touch fitting
① Installation of tube
1) Cut the tube perpendicularly, being careful not
to damage the external surface. Use an SMC
tube cutter TK-1, 2, 3 or 6. Do not cut the tubing
with pliers, nippers, scissors, etc., otherwise
the tubing will be deformed and problems may
result.
2) The outside diameter of the polyurethane
tubing swells when internal pressure is applied
to it. Therefore, it may be impossible to re-
insert the tubing into One-touch fittings. Check
the tubing outside diameter, and when the
accuracy of the outside diameter is +0.07mm
or larger for φ2, and +0.15mm or larger for
other sizes, re-insert it into the One-touch fitting
without cutting the tube. When the tubing is
re-inserted into the One-touch fitting, confirm
that the tubing goes through the release button
smoothly.
3) Grasp the tubing, and slowly push it straight (0
to 5°) into the One-touch fitting until it comes to
a stop.
4) Pull the tubing back gently to make sure it has
a positive seal.
cause air to leak or the tubing to release.
As a guide for checking if the tubing is pulled
out or not, refer to the following table.
② Removal of the tube
1) Push the release button flange evenly and
sufficiently to release the tube. Do not push
in the tubing before pressing the release
button.
2) Pull out the tubing while keeping the release
button depressed. If the release button is not
held down sufficiently, the tubing cannot be
withdrawn.
3) To reuse the tubing, remove the previously
lodged portion of the tubing.
portion is left on without being removed, it may
result in air leakage and make the removal of
the tubing difficult.
Insufficient installation may
If the lodged
Caution
(2) Connection of the metal rod accessories
Do not use tube, resin plug, reducer, etc. after
connecting a fitting with a metal rod (KC series,
etc.) to a One-touch fitting. This can cause the
disconnection of tube.
(3) When mounting the tube, resin plug or metal
rod, do not press the release button.
Do not press the release button unnecessarily
before mounting tubing, resin plugs and metal
rods. This can cause the disconnection of tube.
(4) When using a tubing other than from SMC,
confirm that the tube material and the O.D.
accuracy satisfy the following specifications.
1) Nylon tube ±0.1 mm max.
2) Soft nylon tube ±0.1 mm max.
3) Polyurethane tube +0.15 mm at max.
Do not use the tubing which does not satisfy the
specified tubing O.D. accuracy, or if the tubing
has a different I.D., material, hardness, or
surface roughness from those of SMC's tubing.
If you have any questions, please consult SMC.
Failure to satisfy the specifications may lead to
difficulty in connecting the tubing, leakage,
disconnection of the tubing, or fitting damage.
Recommended Piping Conditions
(1) When connecting piping to the One-touch
fitting, use a pipe length with sufficient
margin, in accordance with the piping
conditions shown in Figure 1.
Also, when using a tying band, etc., to bind the
piping together, make sure that external force
does not come to bear on the fitting.
(see Figure 2)
Tubing size
Nylon
tube
φ4,φ5/32" 56 or more
φ6 84 or more
φ1/4" 89 or more
φ8, φ5/16" 112 or more
-8-
Piping
Within -0.2 mm
Mounting pitch A
Polyurethane
Soft nylon tube
tube
44 or more 26 or more
66 or more 39 or more
70 or more 57 or more
88 or more 52 or more
Unit:mm
Straight-line
Pipe length
20 or more
30 or more
32 or more
40 or more