Vermes MDS 358X - Fig. 72: Example - TTF Tappet; Fig. 73: Example - Tappet Sealing PE; Fig. 74: Example - Nozzle Insert N11; Maintenance of Tappet, Tappet Sealing and Nozzle Insert

Maintenance
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VTK-TR-BA-072e-1 - User Manual MDS 358X Series
10.2 Maintenance of Tappet, Tappet Sealing and Nozzle Insert
As the tappet, the tappet sealing and the nozzle insert belong to the wearing parts of the system,
they need to be cleaned and exchanged regularly.
10.2.1 Maintenance of the Tappet
The tappet has to be cleaned and exchanged in regular intervals (at least every 40 million shots)
or in the case of problems (as soon as it starts to move in a sluggish way). Please be aware that
the lifespan of the tappet not only varies by the material and size, but also depends on your
application. Ceramics (CTF, SNTF), tungsten carbide (TTF) and diamond (PDTF) items are
available. The tappet consists of the tappet rod and the tappet spring.
Fig. 72: Example - TTF Tappet (consists of tappet rod and tappet spring)
10.2.2 Maintenance of the Tappet Sealing
For replacement of tappet sealings a particular counter is not provided, as the necessity depends
on current applications, substances to be dispensed etc. Caused by the tappet movement, some
materials tend to penetrate between tappet and tappet sealing, giving rise to abrasion.
Therefore, you have to inspect the tappet sealing from time to time. To continue working with a
damaged tappet sealing inevitably entails unexpected interruptions, loss of material and an
increased need of cleaning. In some cases, even the actuator can be damaged, due to the ingress
of liquid.
Fig. 73: Example - Tappet Sealing PE
10.2.3 Maintenance of the Nozzle Insert
The nozzle insert has to be cleaned and exchanged in regular intervals or in the case of problems.
Please be aware that the lifespan of the nozzle insert depends on your application. After
disassembling the nozzle insert, immediately use a cleaning wire to push through the channel of
the nozzle insert, to avoid hardening of residue medium. Do not use a clogged nozzle insert,
since it would strongly compromise your dispensing results. Exchange the nozzle insert as soon
as it is worn out, since otherwise it can cause a leakage problem.
Fig. 74: Example - Nozzle Insert N11