Precautions On Design; Selection; Mounting - SMC Networks VNC Series Operation Manual

Warning
1. Cannot be used as an emergency shutoff valve,
etc.
The valves presented in this catalog are not designee for safety
applications such as an emergency shutoff valve. If the valves
are used in this type of system, other reliable safety assurance
measures should also be adopted.
2. This solenoid valve cannot be used for explo-
sion proof applications.
3. Ensure sufficient space for maintenance ac-
tivities.
When installing the products, allow access for maintenance.
4. Liquid rings
In cases with a flowing liquid, provide a by-pass valve in the
system to prevent the liquid from entering the liquid seal circuit.
5. Pressure (including vacuum) holding
It is not usable for an application such as holding the pressure
(including vacuum) inside of a pressure vessel because air
leakage is entailed in a valve.
6. When the conduit type is used as equivalent
to an IP54 enclosure, install a wiring conduit,
etc.
7. When an impact, such as water hammer, etc,.
caused by the rapid pressure fluctuation is
applied, the solenoid valve may be damaged.
Give an attention to it.

Selection

Warning
1. Confirm the specifications.
Give careful consideration to the operating conditions such as
the application, fluid and environment, and use within the
specified operating ranges in this catalog.
2. Type of fluids
Before using a fluid, confirm whether it is compatible with the
materials from each model by referring to the fluids listed in the
catalog. Use a fluid with a dynamic viscosity of 50mm2/s or less.
If there is something you do not know, please contact SMC.
3. Fluid quality
The use of a fluid that contains foreign matter can cause prob-
lems 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 80 to 100 mesh.
4. Air quality
1) Use clean air.
Do not use compressed air that contains chemicals, synthetic
oils including organic solvents, salt or corrosive gases, etc.,
as it can cause damage or malfunction.
2) Install air filters.
Install air filters close to valves at their upstream side. A
filtration degree of 5μm or less should be selected.
VNC / VNH Series
Solenoid Valves for Fluid Control
Precautions 1
Be sure to read this before handling.
Design
Warning
3) Install an aftercooler or air dryer, etc.
Compressed air that contains excessive drainage may cause
malfunction of valves and other pneumatic equipment. To
prevent this, install an aftercooler or air dryer, etc.
4) If excessive carbon powder is generated, eliminate it by
installing mist separators at the upstream side of valves.
If excessive carbon powder is generated by the compressor,
it may adhere to the inside of the valves and cause
malfunction.
Refer to SMC's Best Pneumatics catalog for further details on
compressed air quality.
5. Ambient environment
Use within the operable ambient temperature range. Confirm
the compatibility between the product's composition materials
and the ambient atmosphere. Be certain that the fluid used does
not touch the external surface of the product.
6. Countermeasures against static electricity
Take measures to prevent static electricity since some fluids can
cause static electricity.
7. Low temperature operation
When using valves for water application in cold climates, take
appropriate countermeasures to prevent the water from free-
zing in tubing after cutting the water supply from the pump, by
draining the water, etc. When warming by a heater, etc., be
careful not to expose the coil portion to a heater. Installation of a
dryer, heat retaining of the body is recommended to prevent a
freezing condition in which the dew point temperature is high
and the ambient temperature is low, and the high flow runs.
Warning
1. If air leakage increases or equipment does not
operated 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.
3. Mount a valve with its coil position upwards,
not downwards.
4. Do not warm the coil assembly with a heat in-
sulator, 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.
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Selection

Mounting