IWAKI PUMPS FS-15HT1, Инструкция по эксплуатации

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2.3.3 Effective cross-sectional area
[1] Effective cross-sectional area
In the field of pneumatic devices, the term “Effective cross-sectional area” is used to indicate the capacity to allow
air to flow freely. When air is sent through a pipe, the air cannot run totally through the actual cross-sectional area
of the pipe due to the negative effect of the piping resistance. The defacto cross-sectional area which serves the air
flow is called the effective cross-sectional area. (The value increases with the capacity which allows air or fluid to
flow freely.)
* For each effective cross-sectional area value of a pneumatic device, refer to the catalog of each device issued by
the manufacturer.
[2] Determination of composite effective cross-sectional area
Air devices are connected in series with the pump. It is necessary to determine the composite effective cross-
sectional area of the entire system from each effective cross-sectional area of each device. (Determination of the
effective cross-sectional area on the air exhaust side.)
Composite effective cross-sectional area is determined from the following formula.
S 2
1
=
S1 2
1
+
S2 2
1
+
Sn 2
1
+
S: Composite effective cross-section area
Si: Effective cross-sectional area of each part
Effective cross-sectional area of air device/air pipe: See the catalog issued by each manufacturer.
Quick exhaust valve (QEV-8V : FS-15, 30): Effective cross-sectional area on the exhaust side
(OUT
.
EXH) is 33mm 2 .
Quick exhaust valve (QEV-10V : FS-60): Effective cross-sectional area on the exhaust side
(OUT
.
EXH) is 33mm 2 .
*
Required composite effective cross-sectional area (Air pressure to pump is 0.490MPa
or below)
FS-15 type S=10.7mm 2 or larger
FS-30 type S=17.4mm 2 or larger
FS-60 type S=26.2mm 2 or larger
*
Required composite effective cross-sectional area (Air pressure to pump is 0.294MPa
or below)
FS-15 type S=9mm 2 or larger
FS-30 type S=14mm 2 or larger
FS-60 type S=22mm
2
or larger
Confirm that the composite effective cross-sectional area of the actual air piping is the above mentioned or larger.
2.3.4 Preventive measures against condensation
If condensation is likely to occur in the pipe between the pump and electromagnetic valve, take the following
preventive measures.
¡ Enlarge the diameter of the pipe.
¡ Arrange a heater system over the piping.
¡
Feed heated compressed air to the pump. Observe the temperature limits of the pipe joints, electromagnetic valve,
and other component parts when heating the pipe or compressed air.