Machinery World Tetra Centri A 614HGV-14C, Service & Maintenance

Page: 108 / 278

4.6 Separator bowl
4 Dismantling/Assembly
Measure the height (Hi) of the piston rod (see
fig.) with the depth gauge of a slide callipers.
Make a note of the reading obtained.
Set the valve on the tool in the upwards position
“Unloaded position”. The piston rod will now move
down slightly when the disc stack is released
inside the bowl.
Measure once again the height (H2) of the piston
rod with the slide callipers and make a note of the
reading obtained.
If the height difference H
1
-H
2
is less than the
measure in the table below, the disc stack
pressure is correct.
If the height difference exceeds the measure in
the table below, the number of discs is not
sufficient. Add One or more discs and repeat the
above described check until correct disc stack
pressure is obtained.
An insufficient number of discs permits the disc
Stack to wobble and cause unbalance in the bowl
when running, resulting in vibration that cannot be
Measure of disc stack pressure with use of a
compressing tool
eliminated by balancing.
Bowl disc caulk thickness
Height difference, - Hg **
0,4 mm
1,5 mm
0,5 mm 2,0 mm
0,6 mm 2,0 mm
0,8 mm
2,5 mm
*'>
Calculated approx, values to be used as guidance
Disc stack
The uppermost disc has thicker caulks than the
other ones. The thick-caulked disc must always
be located uppermost in the disc stack. If disc
stack pressure is too low, add one or more bowl
disc (not thick-caulked discs) to the top of the
normal-caulked part of the stack. Refit the thick-
caulked disc uppermost in the stack. Fit the bowl
hood.
108