Brochure

Tightening Torque for Piping
Connection thread Proper tightening torque (N·m)
M5
M6
Rc1/8
1 to 1.5
1 to 1.5
7 to 9
Series VDW
Specific Product Precautions 2
Be sure to read before handling.
Refer to back cover for Safety Instructions, “Handling Precautions for SMC Products”
(M-E03-3) and the Operation Manual for 2 Port Solenoid Valves for Fluid Control
Precautions. Please download it via our website, http://www.smcworld.com
Selection
Warning
7. Fluid quality
쎲
Water
The use of a fluid that contains foreign objects can cause
problems such as malfunction and seal failure by promoting
wear of the valve seat and armature, and by sticking to the
sliding parts of the armature, etc. Install a suitable filter
(strainer) immediately upstream from the valve. As a general
rule, use 50 to 100 mesh.
When using tap water, since substances such as calcium and
magnesium which generate hard scale and sludge are
included and can cause the valve to malfunction, install water
softening equipment and a filter (strainer) right before the valve
to remove these substances.
쎲
Air
Use ordinary compressed air where a filter of 5 µm or less is
provided on the inlet side piping. (Except dry air)
Mounting
Warning
1. If air leakage increases or equipment does not oper-
ate properly, stop operation.
After mounting is completed, confirm that it has been done
correctly by performing a suitable function test.
2. Do not apply external force to the coil section.
When tightening is performed, apply a wrench or other tool to
the outside of the piping connection parts.
Mounting
Warning
3. Mount a valve with its coil position upwards, not
downwards.
When mounting a valve with its coil positioned downwards,
foreign objects in the fluid will adhere to the iron core leading
to a malfunction. Especially for strict leakage control, such as
with vacuum applications and non-leak specifications, the coil
must be positioned upwards.
4. Do not warm the coil assembly with a heat insulator, etc.
Use tape, heaters, etc., for freeze prevention on the piping and
body only. They can cause the coil to burn out.
5. Secure with brackets, except in the case of steel
piping and copper fittings.
6. Avoid sources of vibration, or adjust the arm from
the body to the minimum length so that resonance
will not occur.
7. Painting and coating
Warnings or specifications printed or labeled on the product
should not be erased, removed or covered up.
Piping
Warning
1. During use, deterioration of the tube or damage to
the fittings could cause tubes to come loose from
their fittings and thrash about.
To prevent uncontrolled tube movement, install protective
covers or fasten tubes securely in place.
2. For piping the tube, fix the product securely using the
mounting holes so that the product is not in the air.
1. Preparation before piping
Before piping is connected, it should be thoroughly blown out
with air (flushing) or washed to remove chips, cutting oil and
other debris from inside the pipe.
Install piping so that it does not apply pulling, pressing,
bending or other forces on the valve body.
2. Avoid connecting ground lines to piping, as this
may cause electric corrosion of the system.
3. Tighten threads with the proper tightening torque.
When attaching fittings to valves, tighten with the proper
tightening torque shown below.
4. Connection of piping to products
When connecting piping to a product, refer to its operation
manual to avoid mistakes regarding the supply port, etc.
5. In applications such as vacuum and non-leak speci-
fications, use caution specifically against the
contamination of foreign objects or airtightness of
the fittings.
Caution
R
SOL.
OFF
Switching element
C
Leakage current
Caution
1. Leakage voltage
Particularly when using a resistor in parallel with a switching
element and using a C-R element (surge voltage suppressor)
to protect the switching element, take note that leakage
current will flow through the resistor, C-R element, etc.,
creating a possible danger that the valve may not turn off.
2. Selecting model
Material depends on fluid. Select optimal models for the fluid.
AC/Class B built-in full wave rectifier coil: 10% or less of
rated voltage
DC coil: 2% or less of rated voltage
Power supply
Leakage voltage
13