Back Flow; Description; Model; Shaft Sealing - Xylem LOWARA VOGEL Series Installation,Operation And Maintenance Instruction

Back flow

In systems where pumps are operating in closed circuits under pressure (gas cushions, steam
pressure), the pressure of the gas cushion must not be reduced via the pump, since the back flow
speed may be much higher than the operating speed, which would destroy the unit.

2. Description

2.1 Model

Model Pa: horizontal shaft with external bearing on both sides, pressure side drive normal design,
rotating clockwise (seen from the drive side) with suction branch on left and discharge branch
radially above. Grease lubrication (oil lubrication on 123 Pa).
Special versions: suction branch on right or radially above, oil lubrication, drive on suction side
(anti-clockwise)
Please see the Data sheet and Appendices for the sectional drawings and index of parts for each
pump, and the detail drawings of the shaft sealing.

2.2 Shaft Sealing

There are basically two methods of shaft sealing: the stuffing box and the mechanical seal. You
will find the type of shaft sealing on your pump under the „Notes on construction".
Instructions on packing a stuffing box and on installing and operating mechanical seals are given
in the relevant detail drawings in the Appendix.
See Appendix, „Operations", for when the stuffing boxes and mechanical seals should be used.
Please
You will find more information on stuffing boxes and mechanical seals, and the
note
risks of accidents that these may involve, under Point 4.6 „Operation and
Monitoring" and in Point 5 „Maintenance and Repairs".

2.3 Bearings and Lubrication

The pump shaft is guided in oversized roller bearings. Your Data Sheet will tell you whether your
pump is designed for grease lubrication or oil lubrication.
• Grease lubrication: standard design, except for 123 Pa
• Oil lubrication: standard design with 123 Pa, special design with 43 Pa up to 103 Pa

Oil lubrication

See Table of Lubricants T 011-007 in the Appendix for choice of oil and oil quality.
If the type of oil is changed, check that the new oil is compatible with the left-over oil.
Method of measurement
Dip stick
Oil sight glass
Oil level pipe
Pa 100/3-en
Operating instructions
Level
between the minimum and maximum mark
(make sure that dip stick is inserted correctly)
to middle
to marking
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