Piston pump WDPP

The piston pump WDPP is evolution in pumping highly viscous masses such as bottom ash or dense slurry. The description of pump is two or more cylinders working together in sequence. Control valves on media side and driving medium side. Driving medium is clean water. Piston cylinders can be horizontal, vertical or inclined position. Cylinder orientation is selected according to pumped medium to reach maximum reliability and lifetime of pump components. If medium is very polluted then cylinder will be designed vertical.

Compared to many other piston pumps using hydraulic oil as driving fluid this pump has a lot of advantages using water as driving medium.

The pump WDPP works similarly as a double-piston pump or a three-piston pump. Once one cylinder is being filled under low pressure with slurry, from the other cylinder slurry is discharged into the delivery piping under high pressure. In case of a pump with three cylinders, the third cylinder waits for starting the discharge after having been filled with slurry. In case of a pump with more than three cylinders, the filling or discharging process proceeds simultaneously. Unlike conventional piston pump using hydraulic oil, the pump WDPP is not provided - besides the main cylinders - with any other cylinders interconnected with piston rod. Pressure of driving water is directly transferred through a single piston to the pumped slurry and due to that, it is possible to provide for backwash of the piston sealing by driving medium.

The valves (driving medium and driven medium side) are controlled so that no pressure pulsations occur in the pump delivery piping.


Figure 1: Operating scheme horizontal



Figure 2: Operating scheme vertical


Advantages of the pump WDPP compared to some other types of piston pumps:

  • Lower purchase costs

  • Lower operating costs

  • High hydraulic efficiency (electric energy saving)

  • High lifetime of the main cylinder parts of the pump

  • Low maintenance costs (costs of cones and seats of valves on the slurry side, piston sealings, costs of driving medium components)

  • Environmentally safe driving medium (water)

  • Health friendly driving medium (drinking water) – suitable for food industry

  • Lower demands on purity of driving medium

  • Considerably lower purchase costs of driving medium (filtered industrial water)

  • Simpler elements of driving medium

  • Low requirements on build-up area

  • Lower pressure pulsations in delivery piping (in case of using centrifugal pump for driving medium or in case of using special source of driving medium)

  • Simple cleaning (possibility of using the driving medium for flushing the piston sealing and valves on the slurry side)

  • Possibility of using high-pressure driving medium (water) for directly flushing the slurry delivery piping

  • Possible installation of only one big source of driving medium for more in parallel working pumps (pumping into one pipeline)

  • Possible customization to individual requirements.


Applications of pump WDPP:

  • Power engineering

  • Dense Slurry transportation

  • Fly Ash or Bottom Ash hydraulic transportation

  • Coal hydraulic transportation

  • Ore mining

  • Ores hydraulic transportation

  • Slurry transportation

  • Ore processing

  • Pumping of bauxite slurry (e.g. manufacture of Al2O3 in aluminum works)

  • Pumping of ore concentrators (Cu, kimberlit etc.)

  • Paper industry

  • Pumping of paper pulp

  • Waste-water treatment plants

  • Pumping of sludge

  • Pumping of sludge to filter presses

  • Building industry

  • Pumping of concrete

  • Food industry

  • Pumping of high-viscous food masses

  • Desalination

  • Pressure energy recovery


Specification of the WDPP pump:

  • Number of cylinders: 1, 2, 3 or 4

  • Position of cylinders: vertical / horizontal / inclined

  • Pressure class of pump: PN16 to PN320

  • Material of cylinder (internal surface): chrome / stainless steel / rubber / other…

  • Material of valves and piping (discharge): steel / stainless steel / other…

  • Operated main valves: Hydraulic (oil) / Hydraulic (water) / Pneumatic


Driving medium:

The source of driving medium consists of a storage tank, booster pump, filtration and high-pressure pump or pumps. For high-pressure pump can be used a centrifugal pump for clean medium or slightly polluted medium and/or plunger pump.

The source of driving medium should be located as close as possible to the WDPP pump, in dependence of local conditions.

The source of driving medium should be designed in dependence on particular application (flow, pressure, temperature, driving medium, etc.) and on the basis of customer´s requirements.


Figure 3: Driving medium source scheme

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