METALJET D2+ MAINTENANCE AND SERVICE
Revision 19, November 2016 Page 6-4
Manufacturer information: Manufacturer does not provide any information on expected lifetime of check
valves.
Service instructions: Service manual under Section Replace inlet check valve and Section Replace outlet check
valve.
6.2.4 Nozzle assembly
Background: Nozzles rarely fail during normal operation. However, during jet start and stop there is a small risk
that a previously used nozzle fails to produce a stable jet. If there is any indication of an unstable jet in the
“Focus” image in the “Results” tab after having reached the “Focus” state (see Section 5.8.4) the nozzle
assembly should be exchanged for a new one.
Excillum recommendation: For maximum reliability it is recommended that the nozzle is changed after each
stand still. However, the customer is also free to try to restart with the old nozzle and let the service interval be
entirely driven by jet instability. Nozzle performance must always be verified after the jet pump has been
stopped, see Section 5.8.4.
If a new nozzle fails, this is a strong indication of a more serious contamination of the liquid metal loop itself. In
these circumstances it is recommended to contact Excillum support and then replace the liquid-metal particle
filter, see Section 6.2.5 below.
If a new nozzle fails to start properly on the first attempt Excillum will replace it free of charge but will not
replace more nozzles free of charge until the particle filter, see Section 6.2.5, has been replaced and Excillum
support contacted.
Please see the flow chart in Figure 6-1 for the recommended procedure regarding nozzle and filter change.
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