Johnson Pump MDR Series - Min Back Pressure; Min Flow Required; Temperature Range; Max Temperature Versus System Pressure

10
MDR/EN (0909) 1.0
2.3 Min back pressure
The MDR-series demands a
certain head for good function.
Min head = 0.5 m wc or 0.05 bar
manometric pressure. If less,
install a valve in the discharge
pipe to adjust head.
2.4 Min flow required
To cool and lubricate the impeller bearing and shaft a certain flow
is required through the pump.
Min. flow
l/min
Max. system pressure
bar (20°C)
MDR45 3 3
MDR75 5 3
MDR85 7 3
MDR105 10 3
MDR116 10 3
2.5 Temperature range
P2(PVDF) =-10°C-+100°C
P3(PP) =-10°C-+85°C
2.6 Max temperature versus system pressure
Valid for P3 (polypropylene) pumps tested in water
H
Pump
1
2
4
3
10 20 30 40 50 60 70 80 90
p (bar)
MDR45 / 85 / 105 / 116
°C
MDR75