SUBMERSIBLE PUMPS FOR 4” WELLS IN STAINLESS STEEL

The 4” submersible pumps of the series “ST” have been designed to be installed in 4” wells (100mm) and to pump clean water or water with the slight presence of sand (180 g/m³ max.), without suspended solids.

Temperatures not higher than 35 °C for domestic use (CEI EN 60335-2-41) or 40 °C for other use.

Thanks to the innovative floating impellers, besides that the blockage problems caused by the presence of sand are reduced, also the axial thrust is remarkably reduced granting a longer life to the motor. Further the particular construction of the non-return valve integrated in the upper head protects the impellers and diffusers from the weight of the column and eventual water hammers.

• Upper head of the pump: in precision-cast stainless steel Aisi 304
• Suction flange: in precision-cast stainless steel Aisi 304
• Check valve: in stainless steel Aisi 304
• Pump shaft: in stainless steel Aisi 304
• Outside sleeve: in stainless steel Aisi 304
• Diffusers: Techno-polymer
• Impellers: Techno-polymer

TECHNICAL FEATURES

• Pump body: cast iron G20 with anti-corrosive coating
• Motor bracket: in die casting aluminium UNI 5076 (cast iron for STM 50, 150-550)
• Impeller: Techno-polymer (stamped brass UNI- EN 12165 for STM 150-550)
• Pump shaft: stainless steel Aisi 304 (Aisi 420 F for STM 50-100)
• Mechanical seal: carbon-ceramics

MOTOR

The control motors are asynchronous, squirrel cage-type, closed, with external ventilation

• Incorporated motor protection and capacitor always on, for single-phase models
• The motor protection for three-phase models must be installed by the customer. Equipment compliant with current standards should be used
• Class of insulation:F-service:S1-Degree of protection: IP 44
• Terminal board protection: IP 54