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3.
Specific Product Precautions (4)
(10)The table below shows the standards that
parts comply with. Please refer for the
verification of the operating environment.
Warning
(1) Perform maintenance inspections according to
the procedures indicated in the operation
manual.
If handled improperly, malfunction and damage of
machinery of equipment may occur.
(2) Maintenance work
If handled improperly, compressed air can be
dangerous. The assembly, handling, repair, and
element replacement of pneumatic systems should
be performed by a knowledgeable and
experienced person.
(3) Drain flushing
Remove drainage from air filters regularly.
(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 that appropriate 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.
Caution
(1)
Fittings with sealant: R, NPT
First, tighten the fitting by hand, then use a
wrench appropriate for the hexagon flats of the
body to tighten it a further two or three turns.
For a tightening torque guide, see the table
below.
If the fitting is tightened with excessive torque,
the fitting may break. In particular, for the swivel
elbow, the stud may come off.
(2) Insufficient tightening may cause seal failure,
or loosen the threads.
(3)
Reuse
Normally, fittings with a sealant can be reused
2 to 3 times.
(4)
Once the fitting has been tightened, backing
it out to its original position often causes
the sealant to become defective. Air leakage
will occur.
(5)
Connection thread: G
Tighten fittings with sealant using the proper
tightening torques in the table below.
Items
Material
Standards
Machined
part
Stainless steel
AISI316
MIM part
Stainless steel
Equivalent to
AISI316L
Rubber
parts
Fluororubber
FDA 21CFR
177.2600
Grease
Paraffin oil base
NSF H1
Connection Thread Tightening Method
Maintenance
Tube
Body
Connection thread size
Tightening torque [N
・
m]
NPT, R1/8
3 to 5
NPT, R1/4
8 to 12
NPT, R3/8
15 to 20
NPT, R1/2
20 to 25
Connection
thread size
Proper tightening torque
N
・
m
G1/8
2.9 to 3.2
G1/4
5.7 to 6.3
G3/8
9.5 to 10.5
G1/2
14.3 to 15.8
