Performance Curve: Air OperatedType
Required specification example: Find the pilot air pressure and pilot
air consumption for a discharge rate of 6 l/min. <The transfer fluid is
fresh water (viscosity 1 mPa·s, specific gravity 1.0).>
Note 1) If the total lifting height is required instead of the discharge pressure, a dis-
charge pressure of 0.1 MPa corresponds to a total lift of 10 m.
Selection procedures:
1.First mark the intersection point for a discharge rate of 6 l/min and a dis-
charge pressure of 0.1 MPa.
2.Find the pilot air pressure for the marked point. In this case, the point is
between the discharge curves (solid lines) for SUP = 0.2 MPa and SUP = 0.3
MPa, and based on the proportional relationship to these lines, the pilot air
pressure for this point is approximately 0.25 MPa.
Required specification example: Find the pilot air pressure and pilot air
consumption for a discharge rate of 2.7
l/min, and a viscosity of 100 mPa·s.
Selection procedures:
1.First find the ratio of the discharge rate for fresh water when viscosity is 100
mPa·s from the graph below.It is determined to be 45%.
2.Next, in the required specification example, the viscosity is 100m Pa·s and
the discharge rate is 2.7 l/min. Since this is equivalent to 45% of the
discharge rate for fresh water, 2.7 l/min ÷0.45 = 6 l/min, indicating that a
discharge rate of 6 l/min is required for fresh water.
3.Finally, find the pilot air pressure and pilot air consumption based on
selection from the flow characteristic graphs.
Selection from Flow Characteristic Graph (PA3첸13)
Selection fromViscosity Characteristic Graph
Caution
PA3첸13 Flow Characteristics
PA3첸13 Air Consumption
PA5첸13 Air Consumption
PA5첸13 Flow Characteristics
0
Find the air consumption for operation with a 4 Hz switching cycle and
pilot air pressure of 0.3 MPa from the air consumption graph.
Selection procedures:
1.L
ook up from the 4 Hz switching cycle to find the intersection with SUP = 0.3 MPa.
2.From the point just found, draw a line to the Y-axis to find the air
consumption.The result is approximately 50 l/min (ANR).
Calculating Air Consumption (PA3첸13)
Caution
1. These flow characteristics are for fresh water (viscosity 1 mPa·s,
specific gravity 1.0).
2. The discharge rate differs greatly depending on properties (viscosity,
specific gravity) of the fluid being transferred and operating
conditions (density, lifting range, transfer distance).
SUP = 0.5 MPa
SUP = 0.3 MPa
SUP = 0.2 MPa
234567
20
40
60
80
100
120
140
160
1
0
Cycle (Hz)
Air consumption (
l
/min [ANR])
Cycle (Hz)
Air consumption (
l
/min [ANR])
Viscosity Characteristics (Flow rate correction for viscous fluids)
100
50
0110100 1000
Viscosity (mPa·s)
Ratio of discharge rate against fresh water (%)
Viscosities up to 1000 mPa·s can be used.
Dynamic viscosity ν= Viscosity µ/Density ρ.
ν=
ν(10–3 m2/s) = µ(mPa·s)/ρ(kg/m3)
µ
ρ
0.5
0.4
0.3
0.2
0.1
0
Discharge pressure (MPa)
246810 12
SUP = 0.4 MPa
SUP = 0.2 MPa
SUP = 0.3 MPa
Discharge rate (l/min)
SUP = 0.5 MPa Cycle 7 Hz
Cycle 5 Hz
Cycle 3 Hz
510 15 20 25
Discharge rate (l/min)
0.1
0.2
0.3
0.4
0.5
Discharge pressure (MPa)
SUP = 0.2 MPa
SUP = 0.3 MPa
SUP = 0.5 MPa
SUP = 0.4 MPa
Cycle 5 Hz
Cycle 3 Hz
Cycle 1 Hz
0
50
100
150
200
250
300
1325476
SUP = 0.5 MPa
SUP = 0.3 MPa
SUP = 0.4 MPa
SUP = 0.2 MPa
673
Series PA
Process Pump
Automatically Operated Type
PA
PAP
PAX
PB
PAF
PA첸
PB
