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9
7. Discharge capability
1) Flow characteristic
With reference to flow characteristic graph (shown below), operating condition of the pump can
be set.
Recommended typical condition A:
Obtain pilot air pressure when discharge rate is 6L/min and discharge pressure is 0.25MPa.
<Assumption; Fresh water (viscosity 1mPa
・
s, specific gravity1.0) is used as transported fluid>
1. Plot the cross point between line with discharge rate 6L/min and line with pressure 0.25MPa.
2. Calculate pressure of transported fluid based on the point. In this example, the point is located
between discharge curves (full line) with 0.3MPa and 0.4MPa and it can be found required air
pressure at this point is approx. 0.35MPa in proportional relation.
Caution
- The above flow characteristic graph is for fresh water (viscosity 1mPa
・
s, specific gravity 1.0).
Thus, if the fluid with higher viscosity such as oil is used, convert the fluid to fresh water with
reference to viscosity characteristic graph.
- The discharge rate is affected by characteristic of transported fluid (viscosity, specific gravity,
concentration of slurry) and operating conditions (temperature, pump head, transporting
distance) etc. and should be confirmed before use.
- In the application where the back pressure is applied from discharge port
“FLUID OUT”, the
result of (pilot air pressure - back pressure, i.e. pressure difference) is pilot air pressure on the
graph. Also, it should be noted discharge rate decreases compared with normal condition.
- If required output of compressor is calculated from air consumption, consider the output is 0.75
kW per air consumption of 100L/min (ANR) for reference.
0
0.1
0.2
0.3
0.4
0.5
0
5
10
15
20
25
流量(L/min)
吐出
圧力
(M
Pa
)
SUP=0.5MPa
0.4MPa
0.3MPa
0.2MPa
Dis
c
h
a
rg
e
p
re
s
s
u
re
[
M
Pa
]
Discharge rate [L/min]