Inlet Valve Cones
Repair / Checking
A5.05. 01.08.01.04
M20
en / 05.10.2010 IB023324 2/5
01
•
when the deviation from the straightness is not greater than the following values (Fig. 1).
Measuring range “s” = 200 mm
= support points for test device
•
when the radial run-outs of the valve cones do not exceed the following values:
1.2 Valves cannot be reused when
•
the valve cone face is damaged
(cracks,blowholes)
•
the wear caused by corrosive material is
> 2 %
of the valve head diameter (comparison
with new valve)
•
concave burns “s” caused by high-
temperature corrosion at the lower side
of the valve head
> 1.5 mm (Fig. 2)
•
the lower part of the valve head
indicates severe pitting (formation of so-
called “paving stones”)
•
corrosion pits and mechanical damage
in the area of the valve stem, stem
transition and valve head
•
refinishing limit dimension is exceeded.
2. Cleaning
Clean the valve cone, e.g. blasting with
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