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Caution
1. Remove dusts or drain before piping. They may get into the peripheral
machine / facilities and cause malfunction.
2. When inserting an ultra-soft tube into push-in fitting, make sure to place
an Insert Ring into the tube edge. There is a risk of causing the escape of
tube and a fluid leakage without using an Insert Ring.
3. The product incorporating NBR as seal rubber material has a risk of
malfunction caused by ozone crack. Ozone exists in high concentrations
in static elimination air, clean-room, and near the high-voltage motors,
etc. As a countermeasure, material change from NBR to HNBR or FKM is
necessary. Consult with PISCO for more information.
4. Special option "Oil-free" products may cause a very small amount of a fluid
leakage. When a fluid medium is liquid or the products are required to be
used in harsh environments, contact us for further information.
5. In case of using non-PISCO brand tubes, make sure the tolerance of the
outer tube diameter is within the limits of Table 1.
● Table 1. Tube O.D. Tolerance
mm size
Nylon tube
ø1.8mm
ø3mm
ø4mm
± 0.1mm
ø6mm
± 0.1mm
ø8mm
± 0.1mm
ø10mm
± 0.1mm
ø12mm
± 0.1mm
ø16mm
± 0.1mm
6. Instructions for Tube Insertion
① Make sure that the cut end surface of the tube is at right angle without
a scratch on the surface and deformations.
② When inserting a tube, the tube needs to be inserted fully into the push-
in fitting until the tubing edge touches the tube end of the fitting as
shown in the figure below. Otherwise, there is a risk of leakage.
Tube end
③ After inserting the tube, make sure it is inserted properly and not to be
disconnected by pulling it moderately.
※ . When inserting tubes, Lock-claws may be hardly visible in the hole, observed
from the front face of the release-ring. But it does not mean the tube will
surely escape. Major causes of the tube escape are the followings;
① Shear drop of the lock-claws edge
② The problem of tube diameter (usually small)
Therefore, follow the above instructions from ① to ③ , even lock-claws
is hardly visible.
Polyurethane tube
─
± 0.05mm
─
± 0.15mm
± 0.15mm
± 0.15mm
± 0.15mm
± 0.15mm
± 0.15mm
± 0.15mm
Good
inch size
Nylon tube
ø1/8
± 0.1mm
ø5/32
± 0.1mm
ø3/16
± 0.1mm
ø1/4
± 0.1mm
ø5/16
± 0.1mm
ø3/8
± 0.1mm
ø1/2
± 0.1mm
ø5/8
± 0.1mm
Sealing
Tube is not fully inserted up to tube end.
pisco
pisco.com
http://www.
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Polyurethane tube
± 0.15mm
± 0.15mm
± 0.15mm
± 0.15mm
± 0.15mm
± 0.15mm
± 0.15mm
± 0.15mm
Incomplete
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