Design features and technical details on a Hammelmann process pump

The pumped medium is fed to the pump via the central suction connection.

From here, the medium flows along the outside of the high-pressure sleeves to the pump head and is fed into the pressurization chamber via the suction valve.

During the upward stroke, the pressure valve opens and the piston pushes out the pumped medium via the joint pressure outlet on the pump head casing.

High-pressure chamber

Pressurization chamber

Suction chamber

Packing rings are used for the high-pressure seal. The plunger is guided by a separate bush. This packing seal is particularly suited to media with an increased dirt load.

The extremely small, cylindrical annular gap between the plunger and labyrinth bush is used for sealing. In this intermediate chamber, the pressure is constantly reduced across the seal length. A small high-pressure leak is used as lubrication and is fed back into the suction chamber of the pump.

This pump head was specially developed to handle high volumetric flows and distinguishes itself from other Hammelmann pump heads by having side-mounted valves.

The design principle allows for generous dimensioning of the valve cross-sections, resulting in low flow velocities and wear rates.

The valves and pistons can be accessed from above via individual covers for simple maintenance.

Average piston speed at maximum speed

The pumps in the Quintuplex series are driven with a high power reserve. Low piston speeds increase the service life of pistons and sealing elements, and contribute to smooth running on the pump.

When the pump is in operation, the stroke is absorbed by the individual folds of the bellows. The deformations that occur remain in the elastic range, resulting in virtually no wear on these elements.

Thanks to the vertical design, oscillating forces are fed vertically into the substructure. Unwelcome lateral oscillations – as seen often on horizontal machines – are not generated. This increases the service life of the pistons and sealing elements.

The integrated reduction gear with double helical gearing ensures smooth running with uniform force transmission, without exerting axial force on the bearings.

Different reduction ratios allow for optimal adaptation to the drive unit. The compact design saves on intermediate gears and large rotating masses. The mechanical efficiency is over 95%.

TA Luft, certified according to VDI 2440

The intermediate pump chamber can be sealed off completely from the atmosphere with a gas-tight cover and charged with nitrogen. This variant reliably prevents the unintentional release of liquids, vapors or gases, even in the event of a failure on a plunger seal.

Typical division of life-cycle costs: The use of energy-efficient pumps has an enormous cost-saving potential and makes an important contribution in minimizing the emission of climate-damaging CO2 gases.

The economic efficiency of a high-pressure pump is defined by the amount of energy it consumes. The diagram here shows a typical division of all costs incurred by a high-pressure pump over its life cycle.

In assessing the life-cycle costs, it can be seen that the largest portion of the costs is attributable to energy consumption of the pump, whereas investment costs play a relatively small role at just 19%.