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10.4.11 Determining gap size on HYGIA
D
D
9D
ULD
QW
H
YD
ULD
QW
9D
WUL
DQ
WH
9D
ULD
QW
E
Fig.63:
Gap size on HYGIA
General
The gap size needs to be determined only if modifying/replacing the impeller or
the ring housing. The gap between the impeller and the annular casing
contributes crucially to complying with the intended use. In the case of pumps
with a free-flow impeller, it is not necessary to determine the gap size. Such
pumps have a larger gap by design, which does not have to be adjusted exactly.
Two versions are described below.
Version 1 – Conical spring mechanical seal with seal spacer
Variant 2 - encapsulated (hygienic) mechanical seal
Preparation
1.
Remove the feather key (0940.00) from the shaft (0211.00).
2.
Remove the mechanical seal (0433.00) and the O-rings (0412.00) and
(0412.05).
→ Done.
Determining the air gap (a or a')
Version 1 – Conical spring mechanical seal with seal spacer
1.
Push the seal spacer (0557.00) onto the shaft (0211.00) as far as it will go.
2.
Push the impeller (0230.00) onto the shaft (0211.00), making sure it does not
contact the seal spacer (0557.00). It should be flush with the shaft thread at
the front.
Malfunctions / repairs
Repair
BA.H2A.ADY.002.GB_1
70
18.12.2017