７） Shorten the piping length.
If piping, too long is connected, the volume of the piping becomes larger than that of the cylinder, and the
mist created by adiabatic swelling is prevented from escaping to the air and remains inside the tube. As
the operation is repeated, the amount of mist is increased and may turn into water. Then, the grease is
washed away by the water and a lack of lubrication, wear of packing, air leakage, friction resistance
increase and operating failure is caused subsequently. To prevent this, the following measure should be
taken.
(1)Shorten the piping tube between solenoid valve and cylinder as much as possible to ensure the
created mist is exhausted to the air. For reference, the following relation should be achieved.
Cylinder content volume at atmospheric pressure×0.7≧Piping tube content volume
(2)Connect speed exhaust controller ASV and quick exhaust valve in the circuit of the cylinder to
exhaust the pressure to atmosphere directly.
(3)Locate the piping port downward to prevent the moisture created in the piping from returning to the
cylinder easily.
８） Give consideration not to splash chemical, which could wash away oil, on the sliding part of
the cylinder.
Some chemicals could wash away the grease from the sliding part of the piston rod. Any chemical other
than general cleaning fluid for water and food could shorten the life significantly. Consult SMC if it is
used.
９） Mount the cylinder, support bracket and plug bolt with the following specific tightening
torque.
Table 1
Applicable bore size
Thread size
Tightening torque(N・m)
Φ32・40
M6×1
4.22～7.60
Φ50・63
M8×1.25
10.20～18.40
Fig 2
１０） The mounting screw and bracket for the cylinder might let the dust collected in some
operating conditions.
－
10
－
Take a measure depending on the operating conditions when mounting.
