PAP3313 Flow Characteristics
Required specification example: Find the pilot air pressure for a dis-
charge rate of 6
l
/min, a discharge pressure of 0.25 MPa, and a cycle
of 4 Hz. <The transfer fluid is fresh water (viscosity 1 mPa·s, specific
gravity 1.0).>
Note) 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 0.25 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 = 0.4 MPa and SUP = 0.5
MPa, and based on the proportional relationship to these lines, the pilot air
pressure for this point is approximately 0.45 MPa.
Selection from Flow Characteristic Graph (PAP3313)
Performance Curve: Air Operated Type
Required specifications example:
Find the pilot air consumption for a discharge rate of 6
l
/min, a
cycle of 4 Hz
and a pilot air pressure of 0.25 MPa.
Selection procedures:
1. In the graph for air consumption (4 Hz), start at a discharge rate of 6
l
/min.
2. Mark where this point intersects with the air consumption rate. Based on the
proportional relationship between these lines, the intersection point will be
between the discharge curves SUP = 0.2 MPa and SUP = 0.3 MPa.
3. From the point just found, draw a line to the Y-axis to find the air consump-
tion. The result is approximately 70
l
/min (ANR).
Calculating Air Consumption (PAP3313)
Viscosity Characteristics
(Flow rate correction for viscous fluids)
100
50
0
1
10
100
1000
Viscosity (mPa·s)
Ratio of discharge r
ate against fresh w
ater (%)
PAP3313 Air Consumption (2 Hz)
PAP3313 Air Consumption (3 Hz)
PAP3313 Air Consumption (4 Hz)
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 condi-
tions (density, lifting range, transfer distance).
Required specification example: Find the pilot air pressure for a discharge
rate of 2.7
l
/min, discharge pressure of 0.25 MPa 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 Viscosity Characteristic Graph
Caution
Viscosities up to 1000 mPa·s can be used.
Dynamic viscosity
ν
= Viscosity
µ
/Density
ρ
.
ν
=
ν
(10
–3
m
2
/s) =
µ
(mPa·s)/
ρ
(kg/m
3
)
µ
ρ
0.5
0.4
0.3
0.2
0.1
0
Discharge rate (
l
/min)
2
4
6
8
10
Discharge pressure (MP
a)
SUP = 0.5 MPa
SUP = 0.4 MPa
SUP = 0.2 MPa
Cycle
4 Hz
Cycle
3 Hz
Cycle
2 Hz
2
4
6
8
10
40
80
120
0
0
Discharge rate (
l
/min)
Air consumption (
l
/min [ANR])
SUP = 0.5 MPa
SUP = 0.3 MPa
SUP = 0.4 MPa
SUP = 0.2 MPa
2
4
6
8
10
40
80
120
0
0
Discharge rate (
l
/min)
Air consumption (
l
/min [ANR])
SUP = 0.5 MPa
SUP = 0.3 MPa
SUP = 0.4 MPa
SUP = 0.2MPa
2
4
6
8
10
40
80
120
0
0
Discharge rate (
l
/min)
Air consumption (
l
/min [ANR])
SUP = 0.5 MPa
SUP = 0.3 MPa
SUP = 0.2 MPa
SUP = 0.4 MPa
SUP = 0.3 MPa
686
Series
PAP3000
Summary of Contents for PA3000 Series
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