Share via email
Some fields are missing
send eMail

Syringe pump principle: Micro valves for precision dosing

The smallest quantities of many different fluids must be dosed with precision in laboratory devices. There must be no mixing or contamination to ensure accurate test results. The valve solutions, which can support you, can be found in this article.

Your benefit

  • Precise dosing of low, specified fluid volumes
  • Optimal rinsability thanks to product design that virtually eliminates dead volume
  • Custom, Application-specific system

In the laboratory it is extremely important to dose samples and reagents with precision – to prevent the results from being distorted. Even small volumes of fluid must be dosed extremely accurately, for example using in vitro or molecular diagnostics. A crucial factor to ensure extreme precision are quickly switching valves with optimum rinsing capability.

Find out how to dose even small quantities with precision, using Bürkert micro valves, and how to avoid cross contamination in the laboratory!


This is how dosing functions using a syringe pump

Syringe pump
The syringe pump draws in the medium required for the process through the valve and dispenses it through the dosing needle.
The media to be dosed are in the corresponding containers.
Analysis results
The analysis results of the blood or urine samples must be 100% error free.

You can use syringe pumps to dose small, specific volumes of fluid extremely accurately. In doing so, the syringe pump system works according to a discontinuous principle. A defined volume of fluid is drawn in by the movement of a piston in the pump cylinder and is dispensed in the same channel to a dosing needle. If you want to dose a medium out of a vessel into a cuvette, position a 3/2-way valve, which controls the inlet and outlet channel, in front of the pump.

  1. The syringe pump draws in the medium by the piston moving in the pump cylinder.
  2. By opening and closing, a valve controls into which channel the drawn-in medium is conveyed in the next step.
  3. The piston of the syringe pump moves and the medium is dispensed from the pump to a dosing needle.
Diagramm zeigt Durchflussmenge im Zeitverlauf beim Dosieren mit einer Spritzenpumpe

Insulated dosing with a syringe pump

Using this dosing principle, the medium is not completely drawn into the pump, but into a dosing needle. This process is used particularly for applications which have low dosing quantities.

Both in the cylinder of the syringe pump and in the inlet channel there is an insulating air cushion which causes the medium to come into contact with the dosing tip only. This minimises the risk of contamination. This principle allows integrated cleaning of the dosing tip.

When the medium has been dispensed, a valve opens the cleaning channel. The pressurised cleaning fluid is conveyed through the dosing tip only. The insulating air cushion keeps the syringe pump free of fluid even during the cleaning process.

Pressure generation pump
Syringe pump
Air cushion
Cleaning solution
For example, cleaning solution or reagent

Our expertise: Fast, precise and systematic dosing 

Systematic and individual solutions

For dosing using a syringe pump, we not only offer you a wide range of components and materials, but we also develop tailored system solutions for your facility. In our Systemhäuser <system houses> we combine ideas, development, serial concepts, test laboratories and production under one roof. This is how you will profit from our Systemhaus expertise.

Our micro valves for precision dosing using a syringe pump

Type 0127

2/2 or 3/2-way rocker solenoid valve with separating diaphragm

Type 0127
  • For the highest chemical resistance requirements
  • Compact design with 16 mm width and a flow coefficient of up to 0.058
  • Proven reliability since 1993
  • Flexible design for customised solutions
  • High back-pressure tightness, excellent cleanability and 100% duty cycle

Type 6724

2/2 or 3/2-way Whisper Valve with media separation

Type 6724
  • Highest chemical resistance
  • Compact design with 8.9 mm installation width
  • DN 0.8 mm (vacuum up to 5 bar) and 1.2 mm (vacuum up to 3 bar)
  • Very fast, almost silent switching with < 20 dB (A) and very low power consumption
  • High back-pressure tightness, excellent cleanability and 100% duty cycle

Type 6624

2/2 and 3/2 way Bürkert TwinPower rocker solenoid valve with separating diaphragm

Type 6624
  • For highest chemical resistance requirements
  • Ultra compact design due to Bürkert Twinpower actuator with 10.3 mm width
  • DN 0.8 (5 bar) and DN 1.6 (2 bar)
  • Integrated hit and hold electronic
  • High back pressure tightness with excellent cleanability

Type 6628

2/2 or 3/2 way TwinPower Rocker-Solenoid Valve with separating diaphragm

Type 6628
  • 22 mm ultra compact design with orifices up to DN 3.0
  • Isolating diaphragm for high chemical resistance
  • Circuit function NC, NO and 3 way universal
  • Back pressure tightness via rocker principle
  • Minimal internal volume with excellent cleanability

Do you want to dose reagents and samples with precision and obtain perfect measurement results quickly? If so, get in touch with us.


Our solutions for other dosing principles:

Time-Pressure DosingTime-Pressure Dosing

How can you increase your sample throughput in the laboratory while also ensuring reliable processes? Pressure/time dosing allows you to dose your samples and reagents precisely while protecting them against the introduction of heat.