Multistage submersible pumps WZA
Application
Multi-stage, submersible, impeller pumps type WZA are ideally fit for clean water pumping, including drinking and process water used in a household. WZA pumps should be installed when the water intake makes it impossible to apply a self-priming pump, whereas the depth of water makes it impossible to apply a deep-well pump. WZA submersible pumps can also be used to pump other liquids with pH meter between 6÷8, with density up to 1000 kg/m3 and viscosity up to 13 mm2/s. The temperature of the medium should not exceed 40oC. The liquid can contain non-abrasive inclusions with diameter up to 0.5 mm and their content up to 50 mg/dm3.
WZA pumps are used in:
- water supply systems (water pumping from a well with 6" minimal diameter or from open intakes, tanks, reservoirs), automatic water supply systems (e.g. the AGE 5 automat),
- irrigation systems,
- washing systems,
- drainage,
- rainwater handling.
Technical specifications
| capacity |
1,2 ÷ 21 m3/h |
| delivery head |
60 ÷ 80 m |
| submersion depth |
up to 10 m |
| pumped liquid temperature |
up to 40oC |
| density of the pumped liquid |
up to 1000 kg/m3 |
| viscosity of pumped liquid |
13 mm2/s |
| mass |
15,5 ÷ 22,5 kg |
| motor power |
0,55 ÷ 2,2 kW |
Product marking structure
| a a a |
- pump type (three characters) |
| b |
- pump type/size (denotes successive pump rated value) |
| c c |
- pump type dimension (number of stages) |
| d |
- material execution, as in MATERIAL EXECUTION subparagraph |
| e1 e2 e3 e4 |
- constructional execution, as in CONSTRUCTIONAL EXECUTION subparagraph |
| h |
- supply completeness ( h=4 ) |
| i i i |
- unit selection, coded according to manufacturer's internal documents |
| k |
- product cosmetics ( k=1 ) |
Material execution of WZA pumps
WZA pumps are produced in one material executions
| Pump elements |
Material |
| Upper bearing casing |
brass |
| Lower bearing casing |
| Pressure casing |
| Middle casing |
noryl |
| Stator |
| Impeller |
leksan + brass |
| Motor jacket |
austenitic steel |
| External jacket |
| Suction rose |
| Jointing elements |
| Oil in oil housing |
white mineral oil |
Constructional execution
Constructional execution is marked with e1 e2 e3 e4 code as follows:
"e1" - shows the number of motor phases
"e2 e3 e4" - a reserve is always marked "0"
| "e1" = 1 |
motor 1~ |
| "e1" = 2 |
motor 3~ |
Features:
- modern design solutions,
- guarantee of long-standing, reliable operation and easy access to replacement parts,
- adjustment to individual customer's requirements,
- permanent technical supervision as well as guarantee and post-guarantee servicing,
- low purchase and operation costs,
- relatively long life in hard operational conditions.
Design
WZA units are submersible, multistage, monoblock centrifugal pumps with a dry, rewindable motor. The unit shaft is supported in upper and lower bearing housings by simple ball bearings, grease-lubricated for the full operation period. The induction motor (single- or three-phase) is built in the austenitic steel jacket and hermetically closed with bearing housings on both sides. The shaft is sealed in the lower housing with a mechanical seal (at pump impellers side - hydraulic section of the unit) and with a sealing ring of special design (at motor side - unit drive section). A buffering oil chamber is located between the seals so as to absorb leaks and to create comfortable working conditions for both seals. The unit pumping part is located below its drive (motor) part. The whole block is connected together with the outside jacket, discharge housing and suction rose.
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