Maintenance
2722−1/A1
RT-flex50-D
Wärtsilä Switzerland Ltd
3/ 8
3. Judging an injection valve
For correct functioning and for a reuse of an injection valve observe the following
points:
D Spray pattern: The injection valve works properly if fuel sprays from all spray
holes of the nozzle tip at the specified opening pressure; and no fuel should
drip from nozzle tip when injection is finished.
D For new injection valves the opening pressure is 375 ±10 bar.
On used injection valves a pressure reduction of 30 bar may be acceptable.
Should a readjustment of the opening pressure be necessary, see section
’Adjusting the opening pressure’.
D In order to test tightness between the nozzle needle and needle seat, keep the
pressure in the test bench constant at approx. 20 bar below the opening pres-
sure. During a time period of 10 seconds no ’dripping’ should occur at the
nozzle tip.
D The spray holes of nozzle tip 8 must not be flushed out unduly.
⇒ Injection valves which do not spray efficiently must be dismantled as
described in section 4. Often, a thorough cleaning suffices to make them fully
functional.
Remark: Nozzle tips with flushed out spray holes must be replaced by new ones.
Nozzle holders 5, intermediate pieces 6 and nozzle bodies 13 (Fig. ’B’) with poor
sealing faces must either be replaced or reconditioned by the manufacturer or an
authorized company.
2010-08
Injection Valve: Checking, Dismantling, Assembling and Adjusting
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