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Stjerne-Chrom A/S - Josef Emmerich pump

Hydraulically activated diaphragm pump for chamber filter press at Stjerne-Chrom A/S.

Stjerne-Chrom A/S is a Danish company specializing in surface treatment located in Næstved, Denmark. The company is environmentally certified and therefore takes the handling of industrial wastewater from the factory very seriously.

For purification, an industrial filter press is used, which is suitable for the purpose. The factory wastewater is collected and flocculated with lime before it is pumped and pressurizes the filter press.

In Denmark, process water from production companies must be cleaned of harmful particles before it can be discharged to urban wastewater for further treatment. Copenhagen Pump was approached in 2023 to replace existing peristaltic pumps on a chamber filter press for the purification of process water.

Click on drawing to zoom

The choice fell on a Special type pump which is a hydraulically activated diaphragm dosing pump, also known as a piston diaphragm pump. The Josef Emmerich pump is designed to operate chamber filter presses and, in addition to the built-in safety valve, also has a bypass valve. Together, the two valves regulate and protect the pump. The capacity, which is designed for 1500 l/h, is reduced with increasing pressure until the pump finally only pressurizes the filter press just before the safety valve opens.

The pump has the great advantage of being self-protected while performing a complicated regulation task. The pump is a 1-cylinder pump, which normally gives a strong pulsating flow. However, the Josef Emmerich pump has 2 pulsation dampers, which are designed as wind boilers. This means that there are no membranes in the pulsation damper. On the other hand, a small amount of air is supplied 0.5 l/min into the suction side.

The small amount of air serves to dampen, but also maintains a gas cushion in the pulsation damper. The resulting flow is a smoothed, almost pulsation-free flow. The pressure varies in the application between 15.0 and 15.2 bar, corresponding to a damping of about 99%.

The pictures show the pump installed and commissioned.

The video shows part of the commissioning (i.e. starting up and checking operating parameters) of the pump.

The pump noise is almost completely silenced when the covers are fitted. The hydraulic fluid is water-based and similar to cutting oil.

Pump data:
Pressure 15 bar
Capacity 0-1500 l/h
Speed 68 rpm

Thorbjørn Schrøder
contact me if you have any questions.
+ 45 50 17 40 18
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