

The hydraulic section of a borehole pump is its working area, where the mechanical energy of the electric motor is converted into flow energy. It is responsible for drawing water from depth, creating pressure, and delivering it upwards through the discharge pipe. The reliability, structural precision, and material quality of this section are critical for long-term, uninterrupted operation. The Pedrollo 4SR4-18 model features an advanced multi-stage system, optimized for operation in demanding conditions – depth, pressure, sand, and prolonged use.
Design Features and Technology
The Pedrollo 4SR4-18 is equipped with eighteen hydraulic stages, which allows for significant pressure development and its use in systems with large vertical lifts or extended networks. This makes the model particularly in demand in agriculture, industrial facilities, and large private estates with high water consumption.
Main structural elements:
Impellers made of high-strength technopolymer, reinforced with fiberglass, ensure resistance to mechanical and abrasive wear.
Diffusers and a patented axial insert shape promote optimal water flow and minimize turbulence.
A stainless steel shaft with increased strength for high-load operation.
Mechanical sand protection, allowing for sand content of up to 150 g/m³, prevents clogging and damage to working elements.
The system is designed to work with Pedrollo motors from the 4PD (oil-filled) and 4PS (water-cooled) series, and allows for flexible installation in both vertical and horizontal positions, which is especially important in challenging installation conditions.
Technical Specifications of Pedrollo 4SR4-18
Number of stages: 18.
Minimum well diameter: from 4 inches (100 mm).
Maximum submersion depth: up to 200 m (with 4PD motor) or up to 100 m (with 4PS).
Maximum permissible sand content: 150 g/m³.
Working medium: clean water, temperature up to +35°C.
Installation type: vertical or horizontal.
Compatibility: with Pedrollo 4PD and 4PS electric motors.
Areas of Application for Pedrollo 4SR4-18
This hydraulic section is used in systems where it is necessary to provide increased head and stable water supply:
✅ Automatic water supply systems for cottages and private properties with high water demand.
✅ Irrigation complexes, greenhouse and farming operations where a stable water flow with a high delivery point is required.
✅ Commercial and production facilities requiring reliable deep-well water supply.
✅ Fire suppression systems – the model ensures stable operation under high head and in emergency conditions.
✅ Pumping stations and pressure boosting units with a deep water source.
Advantages of Pedrollo 4SR4-18
High head at moderate flow rate – ideal for systems with large elevation differences.
Increased resistance to abrasive wear – can be used in wells with a small amount of sand.
Energy efficiency – the optimized shape of the impellers reduces the load on the motor.
Reliable long-term operation – confirmed by international practice and real-world usage conditions.
Installation flexibility – suitable for installation in confined spaces.
The Pedrollo 4SR4-18 is a professional solution for those seeking high performance, reliable protection against contamination, and stable operation for many years. If your task is to supply water from depth to systems with extended piping, to a great height, or with intensive water consumption, this model will cope without interruptions. The high Italian build quality and technical innovations of the Pedrollo brand make this hydraulic section a valuable investment in reliability and comfort.
Maximum pumping height, m: | 120 |
Maximum sand content in water, g/m³: | 150 |
Degree of protection: | IP68 |
Height teh, mm: | 583 |
Installation method: | Vertical |
Max. liquid temperature, °C: | +35 |
Coutry of brand: | Italy |
Connection diameter, inch: | 1 1/4 |
Weight, kg: | 6,6 |
Diameter, mm: | 98 |
Tip motor: | three-phase |
Impeller Material: | Delrin |
Body material: | INOX AISI 316 |
Water consumption, m³/h: | 6,0 |
Power, kW: | 1,1 |