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[6] Quick exhaust valve
As shown in Figure 1, the air exhausted out of the pump flows out of the system via the exhaust port of the
electromagnetic valve. (Fig. 1)
Depending upon the type of liquid applied, some permeated gas may mix with the exhaust air. (The inside of the
electromagnetic valve may be corroded by such permeated gas, becoming useless to the system.) In such a case,
install a quick exhaust valve between the pump and the electromagnetic valve. The air will be exhausted through
the exhaust port of the quick exhaust valve, as shown in Figure 2. (A limited amount of air will be exhausted
through the electromagnetic valve.) The quick exhaust valve must be installed in a position close to the pump
(within a distance of 1m). (Fig. 2)
•
Direction of air exhaust
Pump
5-port
electromagnetic
valve
Connected
to controller
Air exhaust
Reducing valve
with filter
Filter
Compressor
(air supply
source)
Pressure gauge
Air
exhaust
EXH
Air
exhaust
EXH
OUT
IN
OUT
IN
Quick
exhaust valve
: Direction of air exhaust
: Air piping
Fig.1 Air Exhaust Without Quick Exhaust Valve
Fig. 2 Air Exhaust With Quick Exhaust Valve
5-port electromagnetic valve : 2 positions, single solenoid
*
The quick exhaust valve has the directions of IN, OUT, and EXH. (The direction symbols are stamped on the
valve.) The piping should be made as shown in Fig. 2.
[7] Air piping
The air piping between the quick exhaust valve and the pump should be decided according to the following table.
In case pump air pressure is 0.49MPa or below
FS-60
Piping length
Less than 2 m
More than 12 m
Pipe inner diameter
FS-15
Less than 4 m
More than 6.5 m
FS-30
Less than 2 m
More than 8 m
FS-60
Piping length
Less than 2 m
More than 9 m
Pipe inner diameter
FS-15
Less than 7 m
More than 6.5 m
FS-30
Less than 1.5 m
More than 6.5 m
In case pump air pressure is 0.294MPa or below