Impeller pump LESTA series

for sandwaterwith electric motor

Overview
The 4" submersible pumps of the LESTA series are designed for installation in 4" wells (100 mm) to pump clean water or water with a slight presence of sand (max. 180 g/m³), without suspended solids. Maximum fluid temperature: 35 °C for domestic use (CEI EN 60335-2-41) or 40 °C for other applications. Floating impellers reduce sand-related blockage and significantly lower axial thrust, extending motor life. The integrated check valve in the upper head protects impellers and diffusers from column weight and water hammer.

Applications
Suitable for installation in 4" wells; typical uses include fountains and water features, water distribution and circulation in civil systems, deep wells, small irrigation systems, and filling of storage tanks.

Technical features

• Upper head: precision-cast stainless steel AISI 304
• Suction flange: precision-cast stainless steel AISI 304
• Check valve: stainless steel AISI 304
• Pump shaft and outside sleeve: stainless steel AISI 304
• Shaft extension: stainless steel AISI 303
• Diffusers and impellers: techno-polymer

Motor

• Service: S1
• Max. 30 starts per hour
• Flange to NEMA standards
• Mechanical seal: graphite-ceramic with sand-fighter labyrinth
• Brackets: nickel-coated cast iron
• Quick watertight cable coupling
• 20 m 4‑wire power cable
• Max immersion depth: 35 m
• Electromechanical single-phase control panel with run capacitor and thermal protection

Technical specifications

• Series: LESTA
• Installation: 4" wells (100 mm)
• Fluid: clean water or water with slight sand content (no suspended solids)
• Max sand content: 180 g/m³
• Max fluid temperature: 35 °C (domestic), 40 °C (other)
• Materials: AISI 304 (upper head, suction flange, check valve, pump shaft, outside sleeve); AISI 303 (shaft extension)
• Hydraulics: diffusers and impellers in techno‑polymer
• Motor service: S1; max 30 starts/hour
• Cable: 20 m 4‑wire
• Max immersion: 35 m
• Integrated non‑return valve in upper head to protect impellers and diffusers