Microdispensing Valve
VTK-TR-BA-072e-1 - User Manual MDS 358X Series
The valve body (1) accommodates the electronics module, the actuator system, the adjust screw
and the tappet (not visible in the picture). The electronics module holds the electronics to receive
the actuator and sensor signals. Here are the connectors for sensor cable and actuator cable
integrated in the surface of the case; they have to be linked to the control unit. The electronics
module is connected to the actuator system, representing the core of the microdispensing valve.
The actuator system houses the sensor, the piezoelectric element and the mechanics to drive the
tappet. Actuator case and mechanics are sealed for protection against dust and contamination.
The adjust screw (8) is at the top end of the valve body.
At the bottom of the valve is the inlet where the tappet (2) runs. The tappet can be exchanged.
Powered by the actuator the tappet moves with high speed back and forth. It hits the dispensing
medium and presses it through the opening of the nozzle insert. Tappets can be made of
ceramics, of carbide metal or of poly diamond. They can have different forms or sizes. A tappet
should be checked and cleaned regularly or exchanged if necessary (see paragraph 10.2.1
"Maintenance of the Tappet", page 138).
The connection between valve body and fluid box is made up of the tappet sealing (3). There are
different types of tappet sealings, e.g. the Tappet Sealings PE and Tappet Sealings PTFE, which
have to be used together with a tappet centering piece.
A small but important module is the nozzle insert (4), which has to be considered as a wearing
part. Thanks to the bayonet fluid box, it can easily be cleaned and exchanged in case of need.
VERMES Microdispensing offers a large selection of different nozzle inserts to allow for optimum
dispensing results, according to the current application. They can differ in form and material.
The nozzle fixation nut (5) contains the nozzle insert (NI).
The fluid box (6) is integrated into the heater MDH-48-BY. It is thermally isolated from the
actuator system. Its purpose is to transport the liquid from the cartridge or the tank to the nozzle
fixation nut. In order to simplify independent cleaning, this module can easily be disengaged
from the valve, just by one click, thanks to the bayonet system. Information how to assemble a
fluid box you can find in paragraph 6.2, page 45. In case you need no heating for your
application, you can use the Mounting Body BY (order no. 1014369) instead of the heater MDH-
48-BY.
The media supply (7) supplies the dispensing medium and is connected with the fluid box.
VERMES Microdispensing GmbH has many different configurations available (see Page 158). For
smaller amounts to be dispensed you can use a cartridge. They come in different sizes and types.
For larger amounts, you can use a tube connector to connect a pressure tank with the fluid box.
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