SMC Networks VQC1000, Operation Manual

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No.VQC1000V-OMM0002-B
VQC1000/2000 Series
Precautions for 5 Port Solenoid Valve
③
Be sure to read before handling.
Caution
Piping
3. Winding of sealant 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 sealant tape is used,
leave 1 thread ridge exposed at
the end of the threads.
4. Closed center
For the closed center, 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.
1)
When using SMC’s fittings, follow the procedures below to
tighten them.
Ⅰ
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.
Ⅱ
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.
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. Uni thread fittings
1) First, tighten the threaded portion by hand, then use a suitable
wrench to tighten the hexagonal portion of the body further at
wrench tightening angle shown below. For the reference value
for the tightening torque, refer to the table below.
2) The gasket can be reused up to 6 to 10 times. It can be replaced
easily when it has sustained damage. A broken gasket can be
removed by holding it and then turning it in the same direction as
loosening the thread. If the gasket is difficult to remove, cut it with
nippers, etc. In such a case, use caution not to scratch the seat
face because the seat face of
the fitting’s 45° gasket is the
sealing face.
7. Piping to products
When piping to a product, refer to the operation manual to avoid
mistakes regarding the supply pert, etc.
Wiring
1. The solenoid valve is an electrical product. For
safety, install an appropriate fuse and circuit
breaker before use.
1. Polarity
When connecting power to a solenoid valve with a DC
specification and a light or surge voltage suppressor, check for
polarity.
If there is polarity, take note of the following.
Without diode to protect polarity:
If a mistake is made regarding the polarity, damage may occur
to the diode in the valve, the switching element in the control
device, power supply equipment, etc.
With diode to protect polarity:
If the polarity connection is wrong, the valve will not operate.
2. Applied voltage
When electric power is connected to a solenoid valve, be careful
to apply the proper voltage. Improper voltage may cause
malfunction or coil damage.
3. Check the connections.
Check if the connections are correct after completing all wiring.
4. External force applied to the lead wire
If an excessive force is applied to the lead wire, this may cause
faulty wiring. Take appropriate measures so that a force of 30 N
or more is not applied to the lead wire.
When instructions are given in the Specific Product Precautions,
follow these specifications.
Lubrication
1. Lubrication
[Rubber seal]
1) Have been lubricated for life by the manufacturer and therefore
do not require lubrication while in service.
2) If a lubricant is used in the system, use class 1 turbine oil (no
additives), ISO VG32. For details about lubricant manufacturers’
brands, refer to the SMC website. Additionally, please contact
SMC for details about class 2 turbine oil (with additives) ISO
VG32.
Once lubricant is utilized within the system, since the original
lubricant applied within the product during manufacturing will be
washed away, please continue to supply lubrication to the system.
Without continued lubrication, malfunctions could occur.
If turbine oil is used, refer to the Safety Data Sheet (SDS) of the
oil.
Caution
Warning
Warning