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9. Installation of a fitting
①. When installing a fitting, use proper tools to tighten a hexagonal-
column or an inner hexagonal socket. When inserting a hex key into the
inner hexagonal socket of the fitting, be careful so that the tool does
not touch lock-claws. The deformation of lock-claws may result in a poor
performance of systems or an escape of the tube.
②. Refer to Table 3 which shows the tightening torque. Do not exceed
these limits to tighten a thread. Excessive tightening may break the
thread part or deform the gasket to cause a fluid leakage. Tightening
thread with tightening torque lower than these limits may cause a
loosened thread or a fluid leakage. Since the sealability is affected by
the processing condition of the installing part, adjust the tightening
torque or correct the installing part, according to the condition.
③. Adjust the tube direction while tightening thread within these limits,
since some PISCO products are not rotatable after the installation.
②. Pass the tube through the nut and insert the barb into the tube up
to the barb end. Then tighten the hexagonal-column of the nut with a
proper tool.
③. Refer to Table 2 which shows the tightening torque.
※. Hold the tube when tightening the nut, since the tube may rotate
along with the nut.
④. Make sure that the nut touches the metallic body. If not, loosen the
nut, disconnect the tube and start over again from the process ①.
⑤. Make sure that there is no leakage after tightening the nut.
⑥. After inserting the tube, make sure it is inserted properly and not to
be disconnected by pulling it moderately.
●Table 2. Nut tightening torque
Tube O.D.
Tightening torque
ø10
Max.4N
·
m
ø12
Max.5N
·
m
ø16
Max.14N
·
m
8-1. Tube disconnection (Push-in fitting)
①. Make sure there is no air pressure inside of the tube, before
disconnecting it.
②. Push the release-ring of the push-in fitting evenly and deeply enough
to pull out the tube toward oneself. By insufficient pushing of the
release-ring, the tube may not be pulled out or damaged by scratch,
and tube shavings may remain inside of the fitting, which may cause
the leakage later.
8-2. Tube disconnection (Compression fitting)
①. Make sure there is no air pressure inside of the tube, before
disconnecting it.
②. Use a proper tool to loosen the nut. Then disconnect the tube.