HM – Piston Diaphragm Pumps

The Process Pump for abrasive Media

ABEL HM Pump Series

The ABEL HM pump series has been specifically developed for operations with increased flow rates combined with high operating pressures, even in continuous operation. They thus convince with increased performance, reliable functionality and especially low operating and maintenance costs. The ABEL HM is available with 2, 3 or 4 diaphragms – in ABEL short form: HMD, HMT, HMQ.

Reliable Positive Displacement Pump thanks to Diaphragm Technology

Piston diaphragm pumps are the first choice worldwide for process-critical pump applications because they can meet the requirements for high availability and process reliability.

Our concept of diaphragm monitoring, which provides a high service life, is the main reasons for the reliability and durability of this pump series. The ABEL HM is therefore particularly advantageous when working with very difficult media. In conjunction with our decades of design experience, we are able to set new standards for pumping technology and equipment, that are regarded as the market leader by many industries around the world.


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

Valve Type

  • Ball Valve
  • Cone Valve
  • Reverse Valve


  • Tailings/Sludge/Fluid Transfer
  • Filter Press Feed
  • Autoclave Feed
  • Rotary Kiln Feed
  • Gland Seal Water
  • Spray Dryer Feed
  • Mine Dewatering
  • Mine Backfilling

Advantages of the ABEL Piston Diaphragm Pump

  • Low operating and maintenance costs due to high overall efficiency, low energy costs and simple maintenance with few wearing parts

  • Pre-formed diaphragm: low wear and high process reliability

  • Diaphragm control and monitoring increases safety and operation free of faults

  • Reliable valve technology with ball or cone valves: problem-free conveyance of sludge with high sand and mineral content, free of blockages when pumping fibrous solids

Double-acting Piston Diaphragm Pump “HMD”

Medium Flow Rates

The double-acting pump (HMD) is suitable for applications up to 90 m³/h (400 GPM) and 10 MPa (1450 psi). In this performance range, typical applications are the feeding of filter presses and spray dryers and the transport of various media. If required, the HMD is also available in ATEX design.

Proven and versatile in Use

The pumped media can be chemical, galvanic, ceramic or other sludges produced in industrial processes. The HMD is also used in wastewater treatment plants, to convey municipal wastewater and sludge. When utilized as a filter press feed pump with a pressure sensor control, this piston diaphragm pump is very energy efficient, has a long service life and a high operational capacity.

The HMD has been an integral part of ABEL’s pump range for years and has more than proven itself, so that today there are far more than 1000 HMD pumps in the field.

HM Operation Principle


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Quadruple-acting Piston Diaphragm Pump “HMQ”

The Pump for high Flow Rates

The ABEL HMQ has 4 preformed diaphragms and thus is designed for higher performance ranges than the HMD and HMT. The HMQ come to the fore when large volumes (up to 410 m³/h – 1805 GPM) of abrasive materials need to be transferred under high-pressure (up to 25 MPa – 3625 psi) conditions. This applies in particular to slurries with a high mineral content, such as in mining.

The best Choice for Mining Applications

From tailings management and mine dewatering to backfilling, the ABEL HMQ is used successfully in mining. Mines around the world rely on an ABEL piston diaphragm pump in their production process because of its reliability and safety against failures. In combination with the ABEL Smart Pump Assistant, operators can even increase reliability and safety, as the monitoring system makes predictions and thus acts preventively. Failures can be reduced to a minimum with the SPA and maintenance becomes more plannable.

Especially when compared to single or multi-stage centrifugal pumps to pump tailings and fly ash, pumps from the HMQ series are an interesting alternative in the lower pressure range.

Short Amortization Time

The initially higher investment costs of an ABEL HMQ piston diaphragm pump compared to other pump systems, soon redeem themselves in a relatively short time. The main reasons for this amortization are the reduced energy costs, increased operating time and lower maintenance costs based on experience. Since piston diaphragm pumps easily handle mixtures with high solids concentrations, the amount of water in the medium can also be reduced significantly in some cases.

Triplex Piston Diaphragm Pump “HMT”

The Solution for high-pressure Applications

The piston diaphragm pump for more extreme pumping applications up to 210 m³/h (905 PM) – up to 25 MPa (3625 psi). It is a single-acting, slow-running triplex piston diaphragm pump. High operating pressures in connection with increased flow rates place particularly high demands on the pump. When abrasive materials with an increased SC-content are present, many industrial partners decide on an ABEL HMT.

For solids transfer, the ABEL HMT provides a clever solution to pumping suspensions that have high dry substance content and a high specific weight. The strong points of the HMT are its quiet operation (low residual pulsation) because the crankshaft has a crank offset of 120° which gives it a steadier volumetric flow.

Applications and Areas of Use

ABEL HMT pumps can be used to transfer a variety of different types of high-viscosity ash and mine slurries. They offer the chemical industry an attractive alternative to conventional plunger pumps and piston pumps, particularly for low flow applications.

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