Microdispensing Valve
VTK-TR-BA-072e-1 - User Manual MDS 358X Series
5.5 Special Features of the Valve
Normally Open
In its not energized state, i.e. in absence of voltage, the valve remains in open position, so that
the tappet tip does not block the channel of the nozzle insert. The liquid in such a situation
therefore may flow. In reality, this fact does not represent a problem, since for this model, usually
high-viscous media are processed which in worst case drain off very slowly.
It is recommended however, that users bear this fact in mind, and reduce the supply pressure to
atmospheric pressure during longer interruptions and before switching OFF the unit.
With Bayonet Fluid Box
Thanks to the bayonet system, the fluid box can be removed easily with just one click from the
valve. There are no screws. This allows for a very quick exchange of nozzle fixation nut and nozzle
insert or of the tappet for cleaning or maintenance purposes. Afterwards you have to carry out
the adjust, in order to establish a convenient position of the nozzle insert with respect to the
tappet. This way a reproducible process remains ensured.
Highest Flexibility
Due to the modular design of the series, nozzle units and fluid boxes can be exchanged easily.
This allows at any time for a quick adaption of the system configuration to new applications. A
comprehensive choice of accessories is also available for special circumstances.
These modifications can be performed in no time, avoiding downtimes for the process. Ordering
the equipment already at an early stage however is recommended; do not forget to specify the
relevant data (Valve ID etc.). Consult our Technical Support beforehand, if special parameters
have to be taken into consideration.
Functionality Independent of the Position
The functionality of the valves does not depend on the fitting position, considerably simplifying
the integration into an existing process.
User-friendly Design
The control unit does not give rise to compatibility problems with respect to the other
components of a complex process structure. Service is possible by keypad or, thanks to the
integrated RS-232C, by remote PC.
Secure Wiring
The valves are equipped with high-quality Lemo connectors. Those can be connected and
disconnected easily, but hold secure against any accidental opening.
Comprehensive Material Selection
Only the best materials are used for the production of Vermes Microdispensing valves.
• All parts in contact with the transported medium consist of high-alloy special steel, rust- and
acid-resisting, or modifications of high-duty polymers of the PE (Polyethylene), PEEK
(Polyetheretherketone) and PTFE (Polytetrafluoroethylene) family.
• Sealings can be made of different materials. You can find notes regarding heat resistance and
chemical resistance in paragraph 9.2, page 121 and paragraph 9.3, page 122.
• For nozzle inserts, special steel, stainless steel, ceramics and PEEK options are permanently in
store, allowing for perfect tailoring of the configuration to the needs of the particular
application.
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