Brochure

2/3 Port Process Valves
Precautions
1
Be sure to read this before handling.
For detailed precautions on every series, refer to main text.
Warning
Design
1. Cannot be used as an emergency shutoff
valve, etc.
The valves presented in this catalog are not designed for sa-
fety applications such as an emergency shutoff valve. If the
valves are used in this type of system, other reliable safety as-
surance measures should also be adopted.
2. Extended periods of continuous energisation
Please consult SMC when using with energisation for long
periods of time.
3. This solenoid valve cannot be used for ex-
plosion proof applications.
4. Maintenance space
The installation should allow sufficient space for maintenance
activities (removal of the valve, etc.).
5. 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.
6. Pressure (including vacuum) holding
It is not usable for applications such as holding the pressure
(including vacuum) inside of a pressure vessel because air
leakage is entailed in the valve.
Warning
Selection
4. Air quality
1)
Use clean air.
Do not use compressed air
which includes chemicals,
synthetic oils containing organic solvents, salt or corrosive
gases, etc., as it can cause damage or malfunction.
2) Install air filters.
Install air filters close
to the valves at their upstream side. A
nominal filtration rating of 5
µm or less should be selected.
3) Install an air dryer or after-cooler, etc.
Compressed air
that includes excessive drainage may cause
malfunction of the valves and other pneumatic equipment. To
prevent this, install an air dryer or after-cooler, etc.
4) If
excessive carbon powder is generated, eliminate it by
installing mist separators at the upstream side of the
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 SMC's “Best Pneumatics” catalogue 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 sure that the used fluid does
not touch the external surface of the product.
6. Countermeasures against static electricity
Take actions to prevent static electricity since some fluids may
cause static electricity.
Warning
Selection
1. Confirm the specifications.
Give careful consideration to the operating conditions such as
the application, fluid and environment, and use within the
operating ranges specified in this catalogue.
2. Fluid
1) Gas
Refer to specification for internal/external leakage.
2) Corrosive gas
Cannot be used since it will lead to cracks by stress
corrosion or result in other incidents.
3. Fluid quality
The use of a fluid which contains foreign matter can cause
malfunction and seal failure. These problems are due to
wearig of the valve seat and armature, and sticking to the
sliding parts of the armature. Install a suitable filter (strainer)
immediately upstream from the valve. As a general rule, use
80 to 100 mesh.
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 pos
-
sible danger that the valve may not turn off.
Switching element
C
OFF
Leakage current
Valve
R
DC coil: 2% or less of rated voltage
Power supply
Leakage voltage
Warning
Mounting
1. If air leakage increases or the equipment
does not operate properly, stop operation.
After mounting is completed, confirm that it has been done co-
rrectly by performing a suitable function test.
2. Do not apply external forces to the coil sec-
tion.
When tightening is performed, apply a wrench or other tool to
the outside of the piping connection parts.
3. Do not warm the coil assembly with a heat
insulator, etc.
Use tape, heaters, etc., to prevent freezing on the piping and
body only. They can cause the coil to burn out.
4. Secure with brackets, except in the case of
steel piping and copper fittings.
5. Avoid sources of vibration or adjust the arm
from the body to the minimum length so that
resonance will not occur.
6. Instruction manual
The product should be mounted and operated after the ins-
truction manual is thoroughly read and its contents are unders-
tood. Keep the instruction manual where it can be referred to
as needed.
7. Painting and coating
Warnings or specifications printed or labeled on the product
should not be erased, removed or covered up.
Caution
Piping
Winding
direction
Pipe tape
Expose approx. 2 threads
Caution
Piping
4. Always tighten threads with the proper tigh-
tening torque.
When attaching fittings to valves, tighten with the proper tigh-
tening torque shown below.
5. Connection of piping to products
When connecting piping to a product, refer to its instruction
manual to avoid mistakes regarding the supply port, etc.
∗ Reference
Tightening of M5 fitting threads
After tightening by hand, tighten approximately 1/6 turn further with a
tightening tool. However,
when using miniature fittings, tighten an additional
1/4 turn after tightening
by hand. (In cases where there are gaskets in two
places,
such as a universal elbow or universal tee, double the additional
tightening to 1/2 turn.)
Connection threads
M5
Rc 1/8
Proper tightening torque N m
1.5 to 2
7 to
9
Tightening Torque for Piping
Caution
Wiring
1. As a rule, use electrical wire with a cross
sectional area of 0.5 to 1.25 mm
2
for wiring.
Furthermore, do not allow excessive force to be applied to the
lines.
2. Use electrical circuits which do not generate
chattering in their contacts.
3.
Use voltage which is within ±10% of the ra-
ted voltage.
When using a DC power supply where importance is placed
on responsiveness, stay within
±5% of the rated value. The
voltage drop
is the value in the lead wire section connecting
the coil.
4. When a surge from the solenoid affects the
electrical circuitry, install
a surge absorber,
etc., in parallel with the solenoid.
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.
Avoid pulling, compressing or bending the valve body when
piping.
2. Wrapping of pipe tape
When connecting pipes,
fittings, etc., be sure that chips
from the pipe threads and
sealing material do not enter
the valve.
Furthermore, when pipe tape is
used,
leave 1.5 to 2 thread
ridges exposed at the end of
the threads.
3. Avoid connecting ground lines to piping, as
this may cause electric corrosion of the
system.
2/3 Port Process Valves
Precautions
2
Be sure to read this before handling.
For detailed precautions on every series, refer to main text.
Back page 2