"ملف ١٨/ ١١ إصلاحات المباني - مباني الوكالة - مراسلات بخصوصها - مضخات المياه لوكالة البحرين." [و‎‎٤‎٤] (١٥٠/٨٩)

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SIGMUND PUMPS (GREAT BRITAIN) LTD . TEAM VALLEY . GATESHEAD
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Fig. 7.—Cross Section of Sigma type VL 2/VI-HD, showing ‘HD’ bearing arrange
ment (see also Fig. 13, illustrating Sigma “V” pump with ‘HD’ bearing).
Bearing ‘HD’
This is an ideal construction for multi-stage Sigma
“V” pumps for the highest delivery heads (anything
above 300-ft.). The shaft having ball bearings or
ring oiled sleeve bearings at both ends. Axial
thrust—a factor which demands careful consideration
in pumps working against very high pressures—is
completely eliminated.
A specially designed, well-proportioned balancing
disc fully counteracts the axial thrust, as the
full pressure from the last impeller is brought to
bear on its whole diameter, thus establishing perfect
equilibrium. The water overflow from the balancing
disc chamber is directed by an external pipe to the
suction chamber. The stuffing box in the “HD”
construction is relieved of all pressure.
Main Components of Multi-stage Sigma “V” Pumps
1
Impeller.
24
Bearing body.
60
2
Sealing ring, suction side.
30
Bearing cover stud.
61
3
Sealing ring, discharge side.
31
Bearing cover.
62
4
Guide ring.
32
Ball bearing.
63
7
Suction cover (with suction flange).
33
Grease lubricator.
64
12
Discharge cover (with discharge
34
Felt ring.
65
flange).
39
Bearing body.
76
13
Stuffing box housing.
49
Bearing cover stud.
80
14
Joint ring (discharge).
50
Bearing cover.
85
15
Bearing body stud.
51
Ball bearing.
86
16
Neck bush (discharge).
52
Grease lubricator.
87
17
Lantern ring (discharge).
53
Felt ring.
88
18
Stuffing box gland.
54
Shaft.
90
19
Stuffing box screws.
55
Impeller key.
91
20
Neck bush (suction).
56
Shaft nut (suction).
96
21
Lantern ring (suction).
57
Coupling key.
97
22
Stuffing box gland.
58
Shaft nut (discharge).
98
23
Stuffing box screws.
59s
Shaft bush (suction side).
99
59d
Shaft bush (discharge side).
Intermediate stage.
Intermediate stage bush.
Bearing distance bush.
Joint ring (intermediate stages).
Connecting bolts.
Coupling.
Securing bolts.
Pulley.
Priming funnel connection.
Drain plug.
Connection for pressure gauge.
Connection for vacuum gauge.
Air cock.
Flushing channel.
Balancing disc.
Balancing disc plate.
Balancing disc bush.
Control ring.
Fig. 8.—Sigma type VN 2/X-D-S.
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