Approvals
Description
Fire-fighting pump units manufactured in compliance with the European standard UNI EN12845. With one or two NKV-pumps and optional jockey pump. Detailed model information can be found in the 1-2 NKV pump unit datasheet.
In normal conditions (zero water demand) the system is maintained under static pressure. The first demand for water results in start-up of the jockey pump, which restores system pressure. If a significant flow rate of water is demanded (opening of sprinklers), the pressure will drop until the two pressure switches connected in series trip to start up the main pump. The two start-up pressure switches must be calibrated in such a way as to start the pumps at the following pressure values:
One pump sets: P = 0,8 x max.pressure
Two pump sets: P1 = 0,8 x max.pressure & P2 = 0,6 x max.pressure
Ex. Max.pressure 10 bar -> pump 1 starts at 8 bar and pump 2 starts at 6 bar
Pumps (NKV 10/NKV 15/NKV 20)
Type: Multistage centrifugal pump
Motor protection: IP55
Insulation class: F
Standard voltage: three-phases 230-400 V / 50 Hz up to 4kW included, three-phases 400 V / 50 Hz
Operating range: from 4-29 m3/h with head up to 249 meters
Liquid temperature: -20ºC – +90ºC
Ambient temperature: max. 40ºC
Installation: fixed, vertical mounting
Pump performance curves and dimensions can be found in the NKV-10/15/20 pumps datasheet.