Submersible pump Pedrollo 4SR4-9

The hydraulic section is the core of a borehole pump, converting the mechanical energy of the motor into hydrodynamic energy: it's "responsible" for lifting water from depth, creating pressure, and directing the flow. It directly determines the equipment's performance, resistance to contamination, and service life. Pedrollo 4SR series pumps feature an innovative, patented hydraulic design that guarantees high efficiency even with sand content in the water of up to 150 g/m³.

Design Features of Pedrollo 4SR4-9

The 4SR4-9 hydraulic section is designed with the specifics of deep wells and continuous operation in mind. It includes nine impeller stages, which ensures optimal water head and allows the pump to be used in systems with significant vertical lift or complex, extended piping layouts.

Key design elements:

Impellers and diffusers are made of high-quality, glass fiber-reinforced technopolymer – this reduces weight and increases wear resistance.

A stainless steel shaft provides strength and rotational stability.

A front insert with sand protection prevents abrasive particles from entering and protects the mechanisms from clogging.

Universal installation – both vertical and horizontal installation is permitted (in the latter case, additional protection against kinks is necessary).

Technical Parameters

Minimum well diameter: 100 mm (4").

Maximum submersion depth:

up to 200 m (with Pedrollo 4PD motor)

up to 100 m (with 4PS motor).

Permissible sand content in water: up to 150 g/m³.

Electric motor type: compatible with 4PD (oil-filled) and 4PS (water-cooled) series.

Materials: stainless steel, technopolymer, anti-abrasive seals.

Application of 4SR4-9 Hydraulics

The 4SR4-9 model is used in various fields where a stable water lift from depth at moderate or high pressure is required: 

✅ Autonomous water supply systems – reliable water supply for country houses, dachas, and cottages. 

✅ Irrigation and agriculture – for drip and sprinkler irrigation systems, water supply to greenhouses and fields. 

✅ Pressure boosting in local systems – especially in multi-story buildings or areas with unstable central water supply. 

✅ Operation in pumping stations and pressure maintenance units.

✅ Firefighting systems – in backup schemes or stationary installations.

Advantages of the Pedrollo 4SR4-9 Model

Optimal balance of head and flow rate – thanks to the 9-stage design.

High resistance to abrasive particles – due to patented sand protection.

Electricity savings – efficient hydraulics reduce the load on the motor.

Ease of installation and maintenance – easy access to key components and quick replacement possibilities.

Durability and stability – Pedrollo quality is confirmed by years of operation in various climatic zones.

If you need a deep-well pump for reliable water supply with moderately high head, the Pedrollo 4SR4-9 is a time-tested solution. It performs excellently in year-round operation, especially in systems where stable pressure and high resistance to clogging are important. The Italian brand Pedrollo guarantees that every detail is designed for intensive work and a long service life without loss of performance.