CM Compact Diaphragm Pumps

Specialized diaphragm pumps for difficult media

ABEL CM piston diaphragm pumps are single or double-acting pumps that are used for difficult media. They are highly resistant to wear, even when used at high pressures over an extended period of time. Their true double-diaphragm technology offers a high degree of safety. When used as a pump for feeding filter presses, the rugged, automatic flow rate control (which does not use complex electronics) is another impressive feature that makes it even more reliable.

The advantages of design

The CM technology has optimal design to withstand high pressures, maximum filling efficiency and is hermetically sealed. In addition, the pump has a safety valve and automatic liquid supplement in the primary circulation. Moreover, the CM can run dry.

ABEL piston diaphragm pumps have built our reputation as a leading manufacturer of reciprocating positive displacement pumps, establishing ABEL as the world market leader in filter press feeding.

Technical Specifications

  • Max. Flow: 30 m³/h (130 GPM)
  • Max. Pressure: 2.5 MPa (362 psi)
  • ATEX design available


  • Nodular cast iron
  • Stainless steel
  • Rubber lined
  • Polypropylene


  • Mine Dewatering
  • Thickener Underflow
  • Sludge/Fluid Transfer
  • Filter Press Feed
  • Gland Seal Water
  • Spray Dryer Feed
  • Rotary Kiln Feed

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    Membrane Filter Press Feed

    On the plant there is a new, recently built, disposal plant for mineral and, in part, for organic drilling slurry: The drilling slurry with a solid content of 15-20% is brought to the plant in tank trucks from which it is pumped through a screening system (ensuring the separation of sand and stones) into 8 storage basins equipped with agitators.

    Use of Compact Diaphragm Pumps

    In a 24/7 operation, 2 membrane filter presses are fed with 4 ABEL compact diaphragm pumps type CM-G-C262 (each pump delivers a flow rate of 10 m³/h). The pumps are in charge of filling the filter presses with abrasive slurries quickly and reliably/constantly. When the pressure of approx. 8-9 bar is reached, the membrane filter presses take over and continue the dewatering of the slurries until the pressure of approx. 13 bar is reached.

    Low Electricity Costs thanks to high Energy Efficiency

    The filling time and the pressing time take approx. 1 hour each. Consequently, after 2 hours the filter cake has reached a solid content of up to 80% and can be dumped into the container standing below the filter press. The weight of the filter cake amounts to approx. 2.7 t per batch. The use of ABEL CM pumps has quickly shown that the overall energy consumption of the plant was very low. According to our customer, 20,000 tons slurry have been treated in 2020 with a power consumption of 22,000 kWh, this translates into a unit electricity consumption of 1.1 kWh/ton only.