Use of pressure reservoir that is maintained by the pump

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A Pressure reservoir could be set to contain overpressure or vacuum. A valve would then be the required precise tool letting the vacuum or overpressure gain access to the test tubing. Two 2/2 valves or one 3/2 valve would be used to apply vacuum or overpressure to the test tubing.

The general work process of such a device would consist of:

1) The pump(s) building up pressure/vacuum. A pressure sensor would be used for loop control.

2) Once pressure is at desired level the valve(s) can be activated.

3) Valve(s) would be activated and would release the pressure/vacuum to push/suck liquid in/out of the test tubing.


Benfits of this approach:

  • The pump(s) would only work sporadically, resulting in:
    • lower energy consumption,
    • no constant noise,
    • no “on-demand-high-precision” pump action,
    • higher overall pump life expectation.
  • Pressure/vacuum reservoir: The size of the reservoir can handle multiple “analysis runs” with high repeatability


  • More technical effort is required (pressure reservoir, sensors, valve for closed loop operation)
Kategorie: mp6