Quattroflow Installation, Operation & Troubleshooting Guide
Rev. 0
Page 6 of 25
www.quattroflow.com
With each turn of the eccentric shaft creates 4 discharge strokes of liquid. The overlapping of the 4 strokes
effectively minimizes the pulsation and enables stable flow conditions.
Quattroflow Pumps have got the following main features:
-
Low pulsation
-
Safe for dry run
-
Self priming
-
Linear turndown
-
Low heat input
2.2
Volume flow and pressure
In opposite to other pump types like centrifugal pumps, positive displacement pumps have got a defined
displacement volume. For that reason Quattroflow Pumps have got a pump curve which is nearly linear over
the complete flow range. The pump curve shows the correlation between flow rate and discharge pressure.
The pump speed is directly related to the flow rate.
The following factors influence the correlation between pump speed and flow rate:
Back pressure
Medium (density and viscosity)
Eccentric shaft of the Pump (in degree)
Back pressure:
The higher the back pressure in your system the lower is the max. flow rate at same pump speed (see Figure
3).
Medium (density and viscosity):
All shown Quattroflow pump curves are valid for water at room temperature that means a density of approx.
1000 kg/m³ and a dynamic viscosity of approx. 1 mPa*s (= 1 cP).
The higher density and / or the viscosity the lower is the max. flow rate of the pump. Please see also chapter
“Medium with high viscosity”.
0,0
20,0
40,0
60,0
80,0
100,0
120,0
140,0
160,0
180,0
200,0
0
500
1000
1500
2000
2500
3000
3500
Flo
w r
at
e
[L
/h
]
Pump speed [rpm]
0 bar
2 bar
4 bar
6 bar
Figure 3 Exemplary pump curve for QF150 pump with 5° eccentric shaft
