38
®
Series SYJ3000
Operation Guide 3
Do not use in an environment where the valve is in
direct contact with corrosive gases, chemicals, salt
water, water or steam.
Do not use in an explosive environment.
Do not use in locations subject to heavy vibration
and/or shock. Check the specifications for each series.
The valve should not be exposed to prolonged sun
light. Use a protective cover.
Remove emissive heat.
If using in an environment where there is possible
contact with water drop-lets, oil, weld spatter, etc.,
take suitable protectionary measures.
When the solenoid valve is mounted in a control
panel or its energizing time is long, make sure
ambient temperature is within valve specification
range.
Environment
Maintenance procedures are shown in operation
manual.
If handled incorrectly, it may cause malfunction and damage to
machine or equipment.
Machine maintenance and supply/exhaust of
compressed air
When machine is to be serviced, first check for removal of
workpieces and run-away of equipment, etc. Then cut the
supply pressure and power and exhaust all compressed air
from the system. (Lock-out valve for release of residual
pressure is recommended) When the machine is to be
restarted, check first that actuators are in their proper start up
positions.
Low frequency operation
Valve should be switched at least once every 30 days to avoid
malfunction.
Manual override
When manual override is engaged, connected equipment
starts to operate. Be sure of safety.
Maintenance
Drain
Remove condensate from air filter regularly.
Lubrication
If a lubricant for rubber seal type valve is introduced, continue
to lubricate and use turbine oil Class 1, VG32 (no additives).
If other lubricant oil is used, it may cause malfunction. Contact
SMC for suggested turbine oil Class 2, VG32 (with additives).
How to Calculate Flow Rate
(At an air temperature 68
°
F)
Subsonic flow : P
1
+0.1013<1.89(P
2
+0.1013)
Q=226S P(P
2
+0.1013)
Sonic flow : P
1
+0.1013 1.89(P
2
+0.1013)
Q=113S(P
1
+0.1013)
Q : Flow rate [ /min(ANR)]
S : Effective area (mm
2
)
P : Differential pressure (P
1-
P
2
) [MPa]
P
1
: Upstream pressure [MPa]
P
2
: Downstream pressure [MPa]
When the air temperature is different, multiply the flow rate
calculated with the above formula by the following coefficient for
compensation.
Air temperature (
°
F)
Coefficient for compensation
--4
1.08
14
1.06
32
1.04
50
1.02
86
0.98
104
0.97
122
0.95
140
0.94
1
2
3
4
5
6
7
1
2
3
4
5
6
