Datasheet

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3 Port Solenoid Valve for Fluid Control/Precautions 2
Be sure to read this before handling.
For detailed precautions on each series, refer to the main text.
1. If air leakage increases or 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 force to the coil section.
When tightening is performed, apply a wrench or other tool to
the outside of the piping connection parts.
3. Be sure not to position the coil downwards.
When mounting a valve with its coil positioned downwards, fo-
reign objects in the fluid will adhere to the iron core leading to a
malfunction.
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 labelled on the product
should not be erased, removed or covered up.
Warning
Caution
Caution
2. Low temperature operation
1. The valve can be used in an ambient temperature of between
–10 to –20
°C, however take measures to prevent freezing or
solidification of impurities, etc.
2. 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 heating by steam, be care
-
ful not to expose the coil portion to steam. Installation of a
dryer or heat retaining of the body is recommended to pre
-
vent a freezing condition in which the dew point temperature
is high and the ambient temperature is low, and the high flow
runs.
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
Power supply
AC/Class B coil: 5% or less of rated voltage
AC/Class H coil: 20% or less of rated voltage
DC coil: 2% or less of rated voltage
Selection
Mounting
Piping
Leakage voltage
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 ot
-
her debris from inside the pipe.
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 rid
-
ges exposed at the end of the threads.
3. Avoid connecting ground lines to piping, as
this may cause electric corrosion of the
system
.
4. Always tighten threads with the proper tighte
-
ning torque.
When attaching fittings to valves, tighten with the proper tighte-
ning torque shown below.
Connection threads
Rc 1/8
Rc 1/4
Rc 3/8
Rc 1/2
7 to 9
12 to 14
22 to 24
28 to 30
Proper tightening torque
N
m
Tightening Torque for Piping
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.
6. Steam generated in a boiler contains a large
amount of drainage.
Be sure to operate it with a drain trap insta-
lled.
7. In applications such as vacuum and non-leak
specifications, use caution specifically
against the contamination of foreign matters
or airtightness of the fittings.
Winding
direction
Pipe tape
Expose approx
. 2 threads