12
Performance Curve
Flow Rate Characteristics
Air Consumption
Selection from Flow Rate Characteristic Graph (PA(P)3310)
Required specifications example:
Find the pilot air pressure and pilot air consumption for a discharge rate of 6 L/min and a discharge
pressure of 0.25 MPa. <The transfer fluid is fresh water (viscosity 1 mPa·s, specific gravity 1.0).
If the total lifting height is required instead of the discharge pressure, a discharge 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 discharge 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 0.43 MPa.
3. Next find the air consumption rate. Find the intersection point for a discharge rate of 6 L/min and
a discharge curve (solid line) for SUP = 0.43 MP a. Draw a line from this point to the Y axis to
determine the air consumption rate. The result should be approx. 58 L/min (ANR).
Caution
1. These flow rate characteristics are for fresh water (viscosity 1 mPa·s, specific gravity 1.0).
2. Flow characteristic is measured based on necessary minimum piping.
3. The discharge rate differs greatly depending on properties (viscosity, specific gravity) of the fluid
being transferred and operating conditions (lifting range, transfer distance), etc.
