KRAL KV - 4 Technical data; 4.1 Operating limits

4 Technical data
3.2 Rating plate
3.2 Rating plate
KRAL GmbH, 6890 Lustenau, Austria
www.kral.at
KRAL GmbH, 6890 Lustenau, Austria
www.kral.at
pS max. / pD max.
Ty p
| Type
SN | Serial no.
Tmin. / Tmax.
ºC
l/min
mm²/s
kg
min
-
¹
bar
bar
∆p
Jahr | Year Gewicht | Weight
n
Q
Art.-Nr. | Item no.
1
2
3
5
4
10
7
9
8
6
11
Fig.2: Rating plate
1 Construction year
2 Max. operating overpressure
suction-side / Max. operating
overpressure pressure-side
3 Temperature range
4 Serial number
5 Type
6 Article number
7 Differential pressure
8 Nominal delivery rate
9 Rated speed
10 Nominal viscosity
11 Weight
4 Technical data
4.1 Operating limits
Size
Parameter Unit 5–
20
32–
42
55–
118
160–
275
370–
450
550–
660
851–
1301
1500–
1700
2200–
2900
Max. operating overpressure
o Pump with flange PN6
[bar] 6
o Pump with flange PN16
[bar] 16
Max. temperature of the
pumped liquid
o Standard magnetic coupling
[°C] 180
o High-temperature magnetic
coupling
[°C] 250
Min. temperature for pump
materials
[°C] -20
Ambient temperature
min.–max.
[°C] -20 ... 50
Viscosity min.–max. [mm
2
/s] 1.5–10000
Speed max.
o At 50Hz
[min
-1
] 2900 1450
o At 60Hz
[min
-1
] 3500 1750
Max. inlet pressure [bar] Up to 16
Tab.3: Operating limits
4.2 Required NPSH values
The required NPSH values of the pump depend on the size, the viscosity of the pumped liquid and the
speed.
The NPSH values are available on the website of the manufacturer:
www.kral.at/en/screw-pumps
8
OIK 09en-GB Edition 2019-11
Operating instructions