Self-priming centrifugal pump Pedrollo JSWm

Self-priming centrifugal pump Pedrollo JSWm

The JSW series includes self-priming centrifugal pumps. The self-priming effect is achieved thanks to the ejector installed in the pump housing. Only a part of the total feed generated by the closed centrifugal impeller is sent to the discharge pipe; the rest is recirculated by means of an ejector, which, being connected to the suction chamber, creates in it the vacuum necessary for self-priming. When starting up for the first time, it is sufficient to fill the pump housing with water, fill the suction line and remove any air pockets that may be present. At the moment of start-up, the water contained in the housing, circulating through the ejector, will move the air from the suction chamber to the discharge chamber, pushing it through the discharge pipeline. At the same time, the vacuum created in this way will cause the water level in the suction pipe to rise, thereby causing self-priming. The constant operation of the self-priming system makes such pumps practically insensitive to the presence (even significant) of dissolved air in the liquid being pumped.

Pumps of this series are recommended for pumping clean water and chemically non-aggressive liquids. Due to their reliability, ease of operation and cost-effectiveness, these pumps can be successfully used in everyday life, in particular, for automatic water supply in conjunction with small and medium-sized tanks - automatic pressure maintenance units, for irrigating vegetable gardens, orchards, etc. The pump must be installed indoors or protected from the weather.
Note: It is recommended in any case to install a foot valve or non-return valve on the suction port.

Peculiarities:

• pump body made of cast iron, equipped with suction and discharge pipes with gas UNI 338 pipe thread, as well as side threaded holes for attaching a pressure gauge and pressure switch.;
• ejector assembly in Noryl GFN2V "General Electric" technopolymer (certified for potable water);
• AISI 304 stainless steel pump housing cover, on which the mechanical seal is mounted;
• AISI 416 stainless steel drive shaft;
• mechanical seal made of ceramic and graphite;
• radial impeller, centrifugal type, made of Noryl GFN2V "General Electric" technopolymer;
  execution and safety rules in accordance with EN60 335-1 (IEC 335-1, CEI 61 -150) EN 60034-1 (IEC 34-1, CEI 2-3);
• pump installation: horizontal.

Electric motor:

• the pumps are directly connected to the Pedrollo electric motor of the appropriate power;
• motor asynchronous, high-performance, silent, closed type with external ventilation;
• suitable for continuous operation;
• insulation class F (B up to 0.90 kW);
• in single-phase motors, a built-in thermal protective device (emergency switch) is provided;
• three-phase motors must be equipped with an appropriate external emergency switch, connected in accordance with current regulations.

Pump characteristics:

• suction height: up to 9 m;
• head: 47 m;
• voltage: 1 phase 220 V;
• maximum supply temperature: +40°С;
• network connection: 220 V/50 Hz;
• protection class: IP44;
• connection connector diameter: 1"

JSWm 2