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dosing pump

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For maximum metering accuracy and reliability

This description is given by the reciprocating movement of the displacer, in the form of a plunger or a diaphragm, which alternately increases and decreases the working space. In order to prevent return flow of the conveyed medium, the working space has to be closed by two valves.

During the backward movement of the displacer, the working space increases and a vacuum is formed relative to the pressure in front of the automatic suction valve. Due to this pressure difference, the suction valve opens and the conveyed fluid is sucked into the working space. Once the displacer reaches its rear dead-center position, the suction stroke ends. The suction valve closes by its own weight or by an additional spring load. During the forward movement of the displacer, the working space decreases. As a result, the pressure increases. When the pressure increases to slightly above the discharge pressure, the automatic discharge valve opens and the fluid volume is now discharged from the working space. In the front dead-center position, the pressure valve closes. Then the next stroke cycle begins.
In most reciprocating positive displacement pump designs, the flow rate depends only minimally on the discharge pressure. This entails a rigid pressure characteristic curve. Furthermore, the flow rate has a linear dependency on the stroke length and stroke frequency. Reciprocating positive displacement pumps are therefore suited to the conveyance and precise metering of fluids across a wide pressure and flow rate range.

Range of applications of a dosing pump

The leak-free variants, i.e. hermetically sealed diaphragm pumps, enormously expand the range of application of the oscillating positive displacement pumps so that the fluids can have the following properties:

  • abrasive (suspensions with SiO2, Al2O3, catalysts, abrasive pastes)
  • explosive (hydrogen, silanes)
  • extreme purity (antibiotics)
  • high vapor pressure (liquefied gases)
  • corrosive (HCl, HF, HNO3)
  • radioactive (plutonium / uranium salt solutions)
  • reactive (water glass, sodium, aluminum alkyl)
  • bad lubricating (liquid gases)
  • sterile (lecithin, vegetable oils, dairy products)
  • toxic (chlorine, bromine)
  • valuable (spice extracts, volatile oils)

Benefits of a dosing pump

Advantages:

  • Extremely rigid pressure characteristic curve
  • Hermetically tight
  • Very precise metering
  • Dry-run safe
  • Self-priming under certain conditions

Delivery characteristics of a dosing pump

  • Pressure range from vacuum up to 1,200 bar (max. 3,500 bar)
  • Flow rate of 1 ml/h to 1,500 m³/h
  • Temperature range from - 270 °C to + 500 °C
  • Viscosity range from 0.1 to 100,000 mPa·s
Dosierpumpe ecoflow
Dosierpumpe triplex
Dosierpumpe ecoflow - Schnitt

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