SMC Networks SYJ3000 Series Operation Manual page 7

Be sure to read before handling. Refer to main text for detailed precautions on every series.
Mounting
Warning
1.
Operation manual
Install the products and operate them only after
reading the operation manual carefully and
understanding its contents. Also, keep the manual
where it can be referred to as necessary.
2.
Ensure sufficient space for maintenance
activities.
When installing the products, allow access for
maintenance.
3.
Tighten threads with the proper tightening
torque.
When installing the products, follow the listed torque
specifications.
4.
If air leakage increases or equipment does
not operated properly, stop operation.
Check mounting conditions when air and power
supplies are connected. Initial function and leakage
tests should be performed after installation.
5.
Painting and coating
Warnings or specifications printed or affixed to the
product should not be erased, removed or covered up.
Also, applying paint to resinous parts may have an
adverse effect due to the solvent in the paint.
Piping
Caution
1.
Refer to the Fittings and Tubing Precautions
for handling one-touch fittings.
2.
Preparation before piping
Before piping is connected, it should be thoroughly
blow out with air (flushing) or washed to remove chips,
cutting oil and other debris from inside the pipe.
3. Wrapping of pipe tape
When screwing piping or fittings into ports, ensure that
chips from the pipe threads or sealing material do not
enter the piping. Also, if pipe tape is used, leave 1
thread ridges exposed at the end of the threads
4.
Closed center and double check valve types
For closed center type, check the piping to prevent air
leakage from the piping between the valve and the
cylinder.
5. Connection of piping and fittings
When screwing piping or fittings into the valve, tighten
them as follows.
SYJ Series
Precautions for 5 Port Solenoid Valve ③
.
(1) When using SMC's M3, M5 fittings, follow the
procedures below to tighten them.
• Connection thread: M3
First, tighten by hand, then use a suitable wrench to
tighten the hexagonal portion of the body an
additional 1/4 turn. The reference value for the
tightening torque is 0.4 to 0.5 N·m.
• Connection thread: M5
First, tighten by hand, then use a suitable wrench to
tighten the hexagonal portion of the body an
additional 1/6 to 1/4 turn. The reference value for the
tightening torque is 1 to 1.5 N·m.
∗Excessive tightening may damage the thread
portion or deform the gasket and cause air leakage.
Insufficient tightening may loosen the threads or
cause air leakage.
• When using a fitting other than an SMC fitting,
follow the instructions given by the fitting
manufacturer.
(2) For a fitting with sealant R or NPT, first, tighten it by
hand, then use a suitable wrench to tighten the
hexagonal portion of the body an additional two or
three turns. For the tightening torque, refer to the
table below.
Connection thread size
(R, NPT)
1/8
1/4
(3) If the fitting is tightened with excessive torque, a
large amount of sealant will seep out. Remove the
excess sealant.
(4) Insufficient tightening may cause seal failure or
loosen the threads.
(5) For reuse
1) Normally, fittings with a sealant can be reused up to
2 to 3 times.
2) To prevent air leakage through the sealant, remove
any loose sealant stuck to the fitting by blowing air
over the threaded portion.
3) If the sealant no longer provides effective sealing,
wind sealing tape over the sealant before reusing.
Do not use any form of sealant other than the tape
type of sealant.
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.
- 6 -
Proper tightening torque
(N·m)
3 to 5
8 to 12
No.SYJ3000-OMM0002-B