Design; Selection; Mounting - SMC Networks VNB Series Operation Manual

Warning
1. Cannot be used as an emergency shutoff valve,
etc.
The valves presented in this catalog are not designed 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 explosion
proof applications.
3. Ensure sufficient space for maintenance activities.
When installing the products, allow access for maintenance.
4. Actuator drive
When an actuator, such as a cylinder, is to be driven using a
valve, take appropriate measures to prevent potential danger
caused by actuator operation.
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
IP65 enclosure, install a wiring conduit, etc.

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. Fluid
1) Type of fluid
Before using a fluid, confirm whether it is compatible with the
materials from each model by referring to the fluids listed in
this catalog. Use a fluid with a dynamic viscosity of 50 mm
or less. If there is something you do not know, please contact
us.
2) Corrosive gas
Cannot be used since it will lead to cracks by stress corrosion
or result in other incidents.
3) Applicable fluid on the list may not be used depending on the
operating condition. Give adequate confirmation, and then
determine a model, just because the compatibility list shows
the general case.
3. Fluid quality
The use of a fluid that contains foreign matter can cause
problems such as malfunction and seal failure due to the
foreign matter getting stuck to the sliding parts and valve seat.
Install a suitable filter (strainer) immediately upstream from
the valve.
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 5 m or less should be selected.
Valves for Fluid Control
Precautions 1
Be sure to read before handling.

Design

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 a
malfunction.
Refer to Best Pneumatics No.5 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
1) The valve can be used in an ambient temperature of not less
than –5C. However, take measures to prevent freezing or
solidification of drainage or impurities, etc.
2) When using valves for water application in cold climates, take
appropriate countermeasures to prevent the water from
freezing 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
/s operate properly, stop operation.
2
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
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.
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Mounting