1. Use clean air.
Do not use compressed air which contains chemicals, synthetic
oils containing organic solvents, salts or corrosive gases, etc.,
as this can cause damage or malfunction.
Air Supply
Warning
1. Install air filters.
Install air filters close to valves at their upstream side. A
filtration degree of 5µm or less should be selected.
2. Install an air dryer or after-cooler.
Compressed air that includes excessive drainage may cause
malfunction of valves and other pneumatic equipment. To
prevent this, install an air dryer or after-cooler.
3. 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 valves and cause malfunction.
Refer to SMC's "Air Cleaning Equipment" catalog for further
details on compressed air quality.
Caution
1. Perform maintenance procedures as shown
in the instruction manual.
If handled improperly, malfunction or damage of machinery or
equipment may occur.
2. Equipment removal and supply/exhaust of
compressed air
When equipment is to be removed, first confirm that measures
are in place to prevent dropping of driven objects and run-away
of equipment, etc. Then cut the supply air pressure and electric
power, and exhaust all compressed air from the system using
its residual pressure release function.
When the equipment is to be started again after remounting or
replacement, first confirm that measures are in place to prevent
lurching of actuators and then confirm that equipment operates
normally.
3. Infrequent operation
Valves should be switched at least once every 30 days to
prevent malfunction. (Use caution regarding the air supply.)
4. Manual override operation
When the manual override is operated, connected equipment
will be actuated. Confirm safety before operating.
Maintenance
Warning
1. Filter drainage
Drain out condensate from air filters regularly. (Refer to specifi-
cations.)
2. Lubrication
In the case of rubber seals, once lubrication has been started,
it must be continued.
Use VG32 Class 1 turbine oil (without additives). Other
lubricating oils will cause malfunctions.
Contact SMC regarding VG32 Class 2 turbine oil (with
additives).
Caution
1. Do not use valves where there is direct
contact with, or in atmospheres of, corrosive
gases, chemicals, salt water, water or steam.
2. Do not use in an explosive atmosphere.
3. Do not use in locations subject to vibration or
impact. Confirm the specifications for each
series.
4. A protective cover should be used to shield
valves from direct sunlight.
5. Shield valves from radiated heat generated
by nearby heat sources.
6. Employ suitable protective measures in
locations where there is contact with water
droplets, oil, or welding spatter.
7. When solenoid valves are mounted in a
control panel or are energized for extended
periods of time, employ measures to radiate
excess heat so that temperatures remain
within the valve specification range.
Operating Environment
Warning
How to Find the Flow Rate
(
at air temperature of 20°C
)
Subsonic flow when P1 + 0.1013 < 1.89 (P2 + 0.1013)
Q = 226S P(P
2 + 0.1013)
Sonic flow when P
1 + 0.1013 ≥ 1.89 (P2 + 0.1013)
Q = 113S (P1 + 0.1013)
Q: Air flow rate [l/min (ANR)]
S: Effective area [mm
²]
P: Pressure drop rate (P
1–P2) [MPa]
P
1: Upstream pressure [MPa]
P
2: Downstream pressure [MPa]
Air temperature (°C)
Correction coefficient
–
20
1.08
–
10
1.06
0
1.04
10
1.02
30
0.98
40
0.97
50
0.95
60
0.94
∗ Correction for different air temperatures
Multiply the flow rate calculated with the above formulas by a
coefficient from the table below.
32
5-Port Solenoid Valve Precautions 3
Be sure to read before handling.
Series VQC
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