SMC Networks VQC4000 Operation Manual Download

Page: 7 / 22

- 6 -

No.VQC4000V-OMX0001

Design / Selection

5. Operation in a low temperature

condition

It is possible to operate a valve in extreme
temperature, as low as -10

C. Take appropriate

measures to avoid freezing of drainage, moisture etc.
in low temperature.

6. Operation for air blowing

When using a solenoid valve for air blowing, use an
external pilot type. Use caution because the pressure
drop caused by the air blowing can have an affect on
the internal pilot type valve when the internal pilot type
valves and external pilot type valves are used on the
same manifold.
Additionally, when compressed air within the pressure
range of the established specifications is supplied to
the external pilot type valve’s port, and a double
solenoid valve is used for air blowing, the solenoids
should normally be energized when air is being
blown.

7. Mounting orientation

Rubber seal : Mounting orientation is free.
Metal seal : Mounting orientation of a single solenoid

is universal.No specific orientation is
necessary. When installing a double
solenoid or a 3-position configuration,
mount the valve so that spool valve is
horizontal.

8. Initial lubrication of main valve

The following initial lubricant has already been applied
to the main valve.



Rubber seal, spool valve: Grease Please consult

with SMC, as there are some standard valve
products that use fluorine grease for food
processing equipment (NSF H-1).



Metal seal, spool valve: Turbine oil

Turbine oil is applied to the spool valve of a metal
seal type. Therefore, turbine oil may seep out when
a new product is delivered, or while the valve is
stored.

9. For the pilot EXH(PE) port

If the solenoid valve and the manifold’s pilot EXH (PE)
port is restricted extremely or blocked, abnormal
operation of the solenoid valve may occur.

Mounting

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.
Please consult with SMC before applying paint to
resinous parts, as this may have an adverse effect due
to the solvent in the paint.

Piping

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

blown 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

or double check valve types,

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 valves,
tighten them as follows.



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