SMC Networks VR51 Series Operation Manual page 7

Handling of One-touch Fittings
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Caution
1.Tube insertion and removal from One-touch fittings
1) Attaching of tubing
a. Cut the tube perpendicularly, being careful not to damage the outside surface. Use SMC tube
cutter "TK-1", "TK-2" or "TK-3". Do not cut the tube with pliers, nippers, scissors, etc., otherwise,
the tube will be deformed and troubles may result.
b. Outside diameter of polyurethane tubing is swelled by applying internal pressure. As such, it
may be that the tubing cannot be re-inserted into One-touch fittings. Make sure to confirm the
tubing outside diameter, and when the accuracy of the outside diameter is more than + 0.15,
insert into One-touch fitting again, not cutting the tubing to use it. When tubing is re-inserted
into One-touch fitting, make sure to confirm that the tubing was able to go through the release
bush smoothly.
c. Grasp the tube, slowly push it into the One-touch fittings until it comes to a stop.
d. Pull the tubing back gently to make sure it has a positive seal. Insufficient installation may cause
air to leak or the tube to release.
2) Removal of tubing
a. Sufficiently depress the release bushing and tubing, making sure to apply even pressure
around the release bushing.
b. Pull out the tubing while depressing the release bushing so that it does not pop out. If the
release bushing is not depressed sufficiently, there will be an increased bite on the tubing and it
will become more difficult to pull out.
c. When the removed tubing is reused, first cut off the section of the tubing which has been
clamped. Reusing the clamped portion of the tubing can cause problems such as leakage,
difficulties in removal, etc.
3) Connecting fittings with metal rods
After connecting a fitting with a metal rod (KC series, etc.) to a One-touch fitting, do not use in
combination with tubes, resin plugs, or reducers. Doing so may result in the fittings coming loose.
4) When mounting tubes, resin plugs, metal rods etc., do not press the release button. Also, do not
press the release button unnecessarily before mounting them. This may cause those parts to
come off.
Precautions on Other Tubing Brands
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Caution
1. When using tubing brands other than SMC, confirm that the tubing outside diameter
tolerances satisfy the following specifications.
1) Nylon tubing within ±0.1 mm
2) Soft nylon tubing within ±0.1 mm
3) Polyurethane tubing within +0.15 mm
Do not use tubing if the outside diameter tolerance is not satisfied. It may not be possible to
connect the tubing, or leakage or disconnection may occur after connection.
within –0.2 mm
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