Centrifugal vortex cantilever pumps of CVK type
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Application and design:
Pumps are used in the fuel systems of the boilers having a low capacity.
Centrifugal - vortex pumps of CVK type - are double-stage, cantilevered
machines driven by a motor via the coupling box. The first stage is the
centrifugal one; the second stage is the vortex one. The centrifugal
impeller ensures cavitation-free operation of the vortex stage. The
centrifugal impeller is secured against axial movement; the vortex impeller
is a floating one. Transfer of liquid from the centrifugal impeller towards
the vortex impeller is carried out along the channel which is executed in
the cover of the pump.
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Liquid to be pumped:
Pumps of CVK type and electric pump units on their base are designed to
pump water and other neutral liquids having a kinematic viscosity of
36*10-6 m2/s (36cSt), with a density not exceeding 1200 kg/m3 and a content
of solid inclusions not exceeding 0,01% by mass and up to 0,05 mm in size.
Temperature of liquid being pumped ranges from 258 up to 378K (from minus
15 up to 105°C).
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Conventional alpha-numeric designation:
For example:
CVK 6,3/160 Y2 TY26-06-1280-87
where CVK 6,3/160 - standard size of the pump;
6,3 - capacity, l/s;
160 - head, m;
Y2 - in-service climatic version and location category
Conventional designation of the characteristic curves:
Q - capacity, m3/h;
P -head, m;
N - maximum power consumption of the pump, kW;
n - frequency of rotation, rpm;
 -
efficiency, %;;
 - admissible positive suction head, m;
Summary table of technical data compiled for the centrifugal-vortex pumps of CVK type.
| Type of the unit |
Capacity, m3/h |
Head, m |
Rotational speed, rpm |
Consumed power, кW |
Admissible positive suction head, m |
| CVK 5/125 |
18 |
125.00 |
2950 |
21.00 |
2.80 |
| CVK 6.3/160 |
22.7 |
160.00 |
2950 |
29.00 |
3.00 |
Pump inlet pressure, MPa (kgf/cm2) maximum: 0,25 (2,5)
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