Piping; Operating Environment; Maintenance; Precautions 2 - SMC Networks VNC Series Operation Manual

Caution
1. Preparation before piping
Before piping is connected, it should be thoroughly blow 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. Wrapping of pipe tape
When connecting pipes, fittings,
etc., be sure that chips from the
pipe threads and sealing materi-
al do not enter the valve.
Furthermore, when pipe tape is
used, leave 1.5 to 2 thread rid-
ges exposed at the end of the
.
threads
3. Avoid connecting ground lines to piping, as
this may cause electric corrosion of the sys-
tem.
4. Tighten piping with the proper tightening
torque.
When attaching fittings to valves, tighten with the proper tight-
ening torque shown below.
Tightening Torque for Piping
Proper tightening torque (N･m)
Connection thread
Rc1/8
Rc1/4
Rc3/8
Rc1/2
Rc3/4
Rc1
Rc1 1/4
Rc1 1/2
Rc2
5. Connection of piping to products
When connecting piping to a product, refer to its operation
manual to avoid mistakes regarding the supply port, etc.

Operating Environment

Warning
1. Do not use in an atmosphere having corrosive
gases, chemicals, sea water, water, water
steam, or where there is direct contact with
any of these .
2. Do not use in explosive atmospheres.
3. Do not use in locations subject to vibration or
impact.
4. Do not use in locations where radiated heat will
be received from nearby heat sources.
5. Employ suitable protective measures in loca-
tions where there is contact with water drop-
lets, oil or welding spatter, etc.
VNC / VNH Series
Solenoid Valves for Fluid Control

Precautions 2

Be sure to read this before handling.

Piping

7 to 9
12 to 14
22 to 24
28 to 30
45 to 50
65 to 70
80 to 90
100 to 110
140 to 150
Warning
1. Removal of product
The valve will reach a high temperature when used with high
temperature fluids. Confirm that the valve temperature has
dropped sufficiently before performing work. If touched inadver-
tently, there is a danger of being burned.
1) Shut off the fluid supply and release the fluid pressure in the
system.
2) Shut off the power supply.
3) Dismount the product.
2. Low frequency operation
Switch valves at least once every 30 days to prevent
malfunction. Also, in order to use it under the optimum state,
conduct a regular inspection once a half year.
Caution
1. Filters and strainers
1. Be careful regarding clogging of filters and strainers.
2. Replace filter elements after one year of use, or earlier if the
pressure drop reaches 0.1MPa.
3. Clean strainers when the pressure drop reaches 0.1MPa.
2. Lubrication
When using after lubricating, never forget to lubricate
continuously.
3. Storage
In case of long term storage after use with heated water,
thoroughly remove all moisture to prevent rust and
deterioration of rubber materials, etc.
4. Exhaust the drainage from an air filter period-
ically.
Warning
1. Valves will reach high temperatures from high
temperature fluids. Use caution, as there is a
danger of being burned if a valve is touched
directly.
2. For pilot type 2-port solenoid valves, when the
valve is closed, sudden pressure resulting from
the startup of the fluid supply source (pump,
compressor, etc.) may cause the momentary
valve to open and leakage to occur, so please
exercise caution.
3. When problems are caused by a water hammer,
install water
(accumulator, etc.). Please consult with SMC
for details.
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Maintenance

Precautions
hammer relief equipment