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YArwAY TemplowHT desuperHeaTer
InstallatIon and MaIntenance InstructIons
control cylinder assembly (3)
once removed, inspect the condition of
the cylinder internally, using a flashlight.
scratches and blemishes may be removed by
either polishing or honing.
The cylinder bore should not exceed
a maximum eccentricity of 0.25 mm.
debris can be removed from the drillings
by blowing through with compressed air.
Carefully clean the cylinder inside and outside,
dressing where necessary, with a small file.
injection probe (7)
Inspect as outlined above, clean all drillings
with compressed air. Make sure the recess
for gasket (5) is thoroughly cleaned. Check if
the counter drilling for index pin (8) is free of
blemishes. If not, dress with a fine file.
Nozzles (17) may be replaceable. If this is
wanted, check with Yarway for possibilities
as special pWHT may be required at this
operation.
FIgure 8 - Models 59/69/79
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FIgure 9
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stem (6)
Withdraw the piston/stem. The piston and stem
are always supplied as a complete assembly.
If the piston shows no signs of wear and tear,
then it may be re-used. replace piston rings
as a matter of course, any time that the unit
is disassembled. Take care not to overstress
the piston rings when fitting. The rings are
marked 'top' and should always point in
the direction of the stuffing box, for proper
functioning. examine the condition of the stem,
where it runs in the stuffing box, remove any
graphite with a fine grade emery cloth,
polishing in the longitudinal direction.
stuffing box parts (10, 11, 12)
remove all rings, lantern ring and packing
material from the valve body. Clean the stuffing
box carefully, using a rotating wire brush
and/or honing device. Cleanless of the packing
area is vital for proper valve sealing. do not
use grease or lubricants in combination with
graphite packing! only ever use genuine Yarway
components, as they are supplied as matched
sets (see under paragraph 'packing set').
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gland
Braided pure expanded graphite
Metal wire reinforced graphite
fibers (marked with white dot)
gland
Braided pure expanded graphite
Metal wire reinforced graphite
fibers (marked with white dot)
5
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