Chapter 5 Maintenance and Inspection
UD-series Screw Compressor 5.4 Disassembly and Inspection
5-19
5.4.3 Shaft Seal (400)
UD models use the double balanced mechanical seal
assembly as the shaft seal.
According to the system applications and working fluids (refrigerants),
UD applies an appropriate one from appropriate three types of
mechanical seal assemblies, i.e., BOD (balanced, O-ring, double)
type, BBD (balanced, bellows, double) type, and BBDE (balanced,
bellows, double, E* made) type.
These mechanical seals are compatible to each other.
For disassembly and assembly work of these mechanical seals, a
qualified trained personnel and special tools are required. For details,
contact us.
Disassembly
After removing the hexagon socket head cap screws [53] and seal
cover [51], disassemble in the order of the colored number shown in
Figure 5-5/5-6/5-7.
Inspection
Although it is instructed that the mechanical seal assembly must be
replaced after abnormality is found in the inspection, only visually
checking the sliding surface may be insufficient in determining any
abnormality. It is thus recommended to always replace it with a new
one, similarly to the case of O-rings and gaskets, if the inspection is
done in such a way. Figure 5-5 BOD type Seal
Figure 5-6 BBD
Ⅱ type Seal Figure 5-7 BBDE type Seal
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