SMC Networks KFG2H-C Series Operation Manual page 8

2. Specific Product Precautions (4)
Maintenance
Warning
(4) Removal of equipment and supply/exhaust of
compressed air
When components are removed, first confirm that
measures are in place to prevent workpieces from
dropping, run-away equipment, etc. Then, cut off
the supply pressure and electric power, and
exhaust all compressed air from the system using
the residual pressure release function.
When the equipment is restarted, proceed with
caution after confirming
measures are in place to prevent cylinders from
sudden movement.
Caution
(1) Be certain to wear safety glasses at all times
during periodical inspections.
(2) During regular maintenance, check for the
following and replace any components as
necessary.
a) Scratches, gouges, abrasion, corrosion
b) Leakage
c) Flattening or distortion of tubing
d) Hardening, deterioration or softness of tubing
e) Loosening of the union nut
(3) Do not repair the fittings or patch the tubing for
reuse.
(4) After operation at a high temperature, leakage
may occur due to time dependent change of
the tube material. If leakage occurs, remove
the tube, cut off the connecting part of the tube,
and connect to the piping again.
Check if the tube dimension accuracy is within the
recommended tolerance. If it is difficult to take the
tube out of the body, bend the tube to the side to
remove.
Tube
Body
that appropriate
- 8 -
Connection Thread Tightening Method
Caution
(1) First, tighten the fitting by hand, then use a
wrench appropriate for the hexagon flats of the
body to tighten it.For a tightening torque guide,
see the table below.
If the fitting is tightened with excessive torque, it
may break.
Connection thread size
M5
G1/8
G1/4
G3/8
G1/2
(2) Insufficient tightening may cause seal failure,
or loosen the threads.
Precautions for use with non-SMC
Caution
(1) When using the KFG2H*-C series with tubing
other than those from SMC, the products are
not subject to warranty.
Tightening torque [N・m]
1 to 1.5
3 to 5
8 to 12
15 to 20
20 to 25