Technical Features and Design Advantages
The TOP-Z series features a "canned" (sealless) structural design that effectively minimizes the risk of fluid leakage, making it particularly suitable for high-pressure or high-temperature environments. The bronze version offers excellent corrosion resistance and is compatible with a wide range of working fluids, while the stainless steel version—constructed from 304 stainless steel—provides enhanced high-temperature and corrosion resistance, making it ideal for demanding industrial settings. The pump supports flow and pressure adjustment to flexibly meet diverse industrial requirements, and its high-efficiency design reduces energy consumption.
Application Scenarios and Industry Suitability
This pump is widely used in sectors such as water treatment, HVAC systems, chemical processing, and food & beverage. Its canned design eliminates leakage issues associated with traditional mechanical seals, making it especially suitable for applications requiring precise flow and temperature control, such as high-temperature hot water or coolant circulation systems. The bronze model is better suited for handling moderately corrosive media, whereas the stainless steel model excels in industrial-grade circulating cooling systems.
Ancillary Components and System Optimization
To enhance system stability, TOP-Z pumps are often paired with rubber vibration dampers or rubber expansion joints. These components effectively absorb operational vibrations, reducing mechanical stress on piping and equipment and preventing issues such as loose connections or seal failures caused by vibration. For instance, rubber vibration dampers utilize an elastic design to isolate noise and accommodate thermal expansion or contraction in piping, thereby extending the equipment's service life.
Construction
Canned circulation pump with threaded or flanged connections. Selectable speed stages for power adjustment.
Rotation direction indicator light (available only for three-phase AC models).
Standard thermal insulation.
Applications
Domestic hot water circulation systems in industrial and building technology.
Equipment/Functions
Operating modes
Speed stage switch
Manual functions
Speed stage setting: 3 speed stages
Automatic functions
Internal protection against excessive winding temperatures (applicable only to pumps with P2 < 180 W; optional for models equipped with SK 602N and SK 622N control switches). Signalling and display functions
Thermal winding contact (WSK, potential-free NC contact) (only for pumps with P2 ≥ 180 W)
Direction of rotation indicator light (only for 3-phase pumps)
Equipment
For flanged pumps: Flange versions
1. Standard version for DN 40 to DN 65 pumps: PN 6/10 combination flange (PN 16 flange according to EN 1092-2) for PN 6 and PN 16 counter-flanges,
2. Standard version for DN 80 pumps: PN 6 flange (designed for PN 16 flange according to EN 1092-2) for PN 6 counter-flanges
3. Special version for DN 40 to DN 80 pumps: PN 16 flange (according to EN 1092-2) for PN 16 counter-flanges,
Cable entry from both sides (only for single-phase and 3-phase pumps with P2 ≥ 180 W)
Standard thermal insulation
Type key
|
Example: |
Wilo-TOP-Z 40/7 |
|
TOP |
Standard pump (threaded or flanged-end water pump) |
|
-Z |
Single-head pump for drinking water circulation |
|
40/ |
Nominal connection diameter |
|
7 |
Nominal head range [m] at Q = 0 m³/h |
Technical data
Permitted temperature range
TOP-Z 20/4 and TOP-Z 25/6 for drinking water up to 3.21 mmol/l (18 °dH): max. +65 °C, short-term operation (2 h) up to +80 °C
TOP-Z 25/10 and above for drinking water up to 3.57 mmol/l (20 °dH): max. +80 °C, short-term operation (2 h) up to +110 °C
Mains connection:
1~230 V, 50 Hz (depending on model)
3~230 V, 50 Hz (with optional switch plug)
3~400 V, 50 Hz
Protection class IPX4D
Threaded or flanged connection (depending on model) Rp ¾ to DN 80
Max. operating pressure for standard models: 6/10 bar or 6 bar (special models: 10 bar or 16 bar)
Materials
Pump housing: Stainless steel/red brass/grey cast iron (depending on model)
Impeller: Plastic
Shaft: Stainless steel/ceramic (depending on model)
Bearing: Carbon, synthetic resin-impregnated
Scope of delivery
Pump
Thermal insulation
Seals for threaded connections
Washers for flange screws (for nominal connection diameters DN 40 – DN 65)
Installation and operating instructions
Options
Special models for PN 16 operating pressure
Special voltage models available on request
Accessories
Screw connections for threaded connections
Adapter fittings
Wilo-SK 601N timer control switch
For 3~400 V pumps:
Conversion plug 3~230 V, 50 Hz
Wilo SK 602N/SK 622N relay for full motor protection
For 1~230 V pumps:
Wilo SK 602N/SK 622N relay for full motor protection