Self-priming centrifugal pump Pedrollo JCRm

Self-priming centrifugal pump Pedrollo JCRm

Principle of operation

The JCR series includes self-priming centrifugal type electric pumps with a stainless steel pump housing. The self-priming effect is achieved thanks to the ejector installed in the pump housing. Only part of the total flow generated by the closed centrifugal impeller is sent to the discharge pipe: the remaining part is recirculated by means of an ejector, which, being connected to the suction chamber, creates a vacuum in it 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.

Scope and installation

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.

Structural characteristics

Pump body in AISI 304 stainless steel, equipped with suction and discharge ports with gas UNI 338 pipe thread.
AISI 304 stainless steel pump housing cover on which the mechanical seal is mounted.
Ejector assembly in Noryl GFN2V "General Electric" technopolymer (certified for potable water).
Impeller, radial, centrifugal type, made of Noryl GFN2V "General Electric" technopolymer (certified for potable water).
Drive shaft in AISI 416 stainless steel.
Mechanical seal made of ceramic and graphite.
Electric motor: the pumps are directly connected to a PEDROLLO electric motor of 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).
Single-phase motors have a built-in thermal protection device (emergency switch).
Three-phase motors must be equipped with an appropriate external emergency switch, which must be connected in accordance with current regulations.
Degree of protection IP 44.
Execution and safety regulations in accordance with EN60 335-1 (IEC 335-1, CEI 61-50) IEC 34 standards.
The characteristics of the curves in the table have tolerances according to ISO 2548.

JCRm 1

JCRm 2