CNSv 20-70 - Centrifugal sectional vertical pumps CNSv

  • Series description
  • Technical characteristics
  • Downloads
  • Multistage
  • Water supply
  • Circulation
  • Boiler water
  • Circulation
  • Boiler water
  • Condensate removal
  • Clear water
  • Hot water
  • Condensate


Centrifugal, stage chamber, vertical pumps CNSv series and electric pump units on their base are intended for handling water and other non-aggressive and incombustible liquids with рН = 7...9,2, at a temperature not more than 393К (120°С), with mechanical impurities not exceeding 0,1% by mass, and solid particles not exceeding 0,1mm in size.

CNSv pumps are used to supply water for the steam boilers of low and mean boiler capacity, and are also applied at the pressure boosting installations, at the commercial plants, for the public building and housing construction work, as well as for the provision of the flow circulation with hot and cold water.

Pumps (units) are intended for operation both indoors and outdoors under the shed at a temperature of ambient air ranging from 273 up to 323К (from 0 up to +500С).

CNSv pumps are related to the items of aspect 2 (repairable ones) as per GOST 27.003-90 and are manufactured in climatic version UHL location category 4 and in climatic version Т, location category 2 as per GOST 15150-69.

General safety requirements of the pumps and units correspond to GOST R 52743-2007.

Pumps (units) are not intended for operation in explosion-and-fire dangerous premises.

The pumps and units are designed for servicing in the regions having a seismicity of up to number 8 according to the scale MSК-84. With that the mechanical loads acting on the pump (unit) should correspond to the loads of the eight-number reading of the seismicity scale, provided the unit is set to zero mark.


Unit consists of the pump and driving motor, connected with elastic coupling.

CNSv pump – is the centrifugal, stage chamber, vertical pump with one-sided arrangement of impellers.

The principle of operation of the pump consists in transforming mechanical energy of the drive into hydraulic power of the liquid.

Pump consists of suction and delivery bodies with the sections installed between them.

Sections-diaphragms accommodating the guiding devices connected and joined to the suction and delivery bodies with coupling studs. Joints are sealed by rubber rings.

The suction and delivery branch pipes are arranged horizontally and in the same plane. At a Customer request, it is possible to turn the branch pipes relatively to each other.

Mounting dimensions of flanges of the suction and delivery branch pipes are made as per GOST 12815- 80, version 1.

The pump is connected to the motor by means of the connecting piece.

The rotor of the pump consists of the shaft, impellers and bushings. The said rotor rotates in two bearing supports. The radial and radial-thrust bearings serve as the upper support; the lower support is given – by the plain bearing, installed in the suction body. The sense of rotation of the rotor - right-handed (clockwise, as viewed from the motor end) and it is indicated by the arrow arranged on the bracket.

Stuffing-box seal of the shaft.


  • industrial water- and heat supply
  • municipal water- and heat supply
  • thermal power - boiler feed pumps
  • CHP: condensate removal pumps
  • supply of hot water, heat supply in water supply & treatment systems

Features /Advantages

  • vertical installation provides space saving
  • stuffing box made of modern thermal expanded graphite material considerably reduces time for maintenance

Technical parameters

Options Values
Series CNSv
Flow (nomin.), m³/h 20
Head, m 70
Pump power input (nomin.), kW 7
Rotation speed, rpm 2950
Rotation speed, c˜¹ 49.2
Pump inlet pressure, kgf/sm², max 4
Pump efficiency,% 60
Voltage, V 380
Frequency, Hz 50
Type of current AC
Number of stages 6
Admissible positive suction head, m, max 3.5

Pump type key

Example: CNSv 20-120-1 UHL 4 TU 3631-166-05747979-2001 , where :

  • CNSv – is centrifugal, stage chamber, vertical pump;
  • 20 – capacity, m3/h;
  • 120 – head, m
  • 1 – arrangement of branch pipes;
  • UHL – climatic version;
  • 4 – location category

Instruction manual :

All technical documentation in the Russian version of the site »

Certificates, permits :

All certificates, permits in the Russian version of the site »

Order forms :

  • "General order form for pumps"
    (19.07.2013 / 54.5 Kb / doc)