Single-stage, centrifugal pumps type NHV
Application
Th e NHV pumps are used for pumping of low-viscosity liquids which are clean or contain only trace amounts of impurities.
The NHV pumps find application in:
- water supply systems and water mains,
- water treatment plants,
- air-conditioning systems
- cooling systems
- pulp and paper industry
- chemical and petrochemical industry
- fi re-fi ghting systems
- power plants
Basic technical data
| Capacity |
up to 1700 m3/h |
| Delivery head |
up to 100 m |
| Temperature of pumped liquid |
from -15 up to +140oC |
| Working pressure |
10 bar (16 bar) |
| R. P. M. |
1500, 3000 |
| Suction fl ange |
DN 50 ... DN 300 mm |
| Discharge fl ange |
DN 32 ... DN 250 mm |
Th e NHV pumps are single-stage, centrifugal, normally sucking, impeller pumps with horizontal shaft axis. Main dimensions and rated parameters conformable to EN 733.
Suction and discharge fl anges comply with ISO 7005-2/PN 16.
Due to special modular design, the whole bearing unit, including the impeller and casing, can be removed without the need to dismantle the system.
All impellers are statically and dynamically balanced according to ISO 1940, class 6.3. Axial thrust is balanced by using a system of rings and balance openings.
Product marking structure NHV
NHV-32-250/1.d.ee1e1e2.h.iii.k
| NHV-32-250 |
- Pump type (designation acc. to EN 733) (example) |
| 1 |
- Impeller trimming
(numbers: 3000 rpm. - letters: 1500 rpm.) |
| d |
- Materials execution |
| e e1 e1 e2 |
- Constructional execution |
| h |
- Completeness of supply |
| i i i |
- Motor selection |
| k |
- Finishing |
Material execution
| Pump part |
Materials "d" |
| A |
B |
C |
D |
E |
F |
G |
| Casing |
Grey cast iron |
Grey cast iron |
Tin bronze |
Stainless cast steel 316 |
Spheroidal cast iron |
Carbon cast steel |
staliwo nierdzewne 304 |
| Sealing body |
Grey cast iron |
Grey cast iron |
Tin bronze |
Stainless cast steel 316 |
Spheroidal cast iron |
Carbon cast steel |
Stainless cast steel 304 |
| Impeller |
Grey cast iron |
Bronze |
Tin bronze |
Stainless cast steel 316 |
Bronze |
Bronze |
Stainless cast steel 304 |
| Shaft |
Stainless steel |
Stainless steel |
Stainless steel |
Stainless cast steel 316 |
Stainless steel |
Stainless steel |
Stainless steel |
| Bearing housing |
Grey cast iron |
Grey cast iron |
Grey cast iron |
Grey cast iron |
Grey cast iron |
Grey cast iron |
Grey cast iron |
Application of non-standard materials is possible aft er consultation with the manufacturer.
Constructional execuion
Pump
constructional
execution |
Name of tconstructional execution |
|
e
|
1
|
for liquids up to +105oC
|
|
2
|
for liquids up to +140oC
|
|
e1e1
|
01
|
cord packing fl ushed with pumped liquid
|
|
02
|
cord packing fl ushed with external liquid
|
|
03
|
cord packing cooled with external liquid
|
|
04
|
cord packing fl ushed with pumped liquid, wear ring and protection sleeve
|
|
05
|
cord packing fl ushed with external liquid, wear ring and protection sleeve
|
|
06
|
cord packing cooled with external liquid, wear ring and protection sleeve
|
|
10-12
|
single mechanical seal
|
|
13
|
double mechanical seal
|
|
20-22
|
single mechanical seal, impeller with wear ring
|
|
23
|
double mechanical seal, impeller with wear 2 in 6
|
|
30
|
compact mechanical seal
|
|
31
|
compact mechanical seal, impeller with wear 2 in 6
|
|
e2
|
0
|
plain closed ball bearing
|
|
1
|
plain ball bearing, oil-fi lled chamber + oil level indicator
|
|
2
|
double-row angular closed ball bearing
|
|
3
|
double-row angular ball bearing, oil-fi lled chambel + oil level gauge
|
Supply completeness
1 - Pump without motor
2 - Pump with motor coupling
3 - Pump with motor coupling and foundation plate
5 - Pumping aggregate with foundation plate
Product cosmetics
1 - Standard
2 - Special
|