The Wilo PW series vortex self-priming pump is a high-efficiency fluid transfer unit that combines German precision engineering with innovative design. Its features can be detailed across several dimensions:
I. Core Technological Innovations
Vortex Impeller Structure
It utilizes a multi-vane closed vortex impeller. A unique hydrodynamic design generates a high-speed vortex flow field, enabling efficient gas-liquid separation. This structure grants the pump powerful self-priming capabilities—achieving a maximum lift of 8 meters—and maintains self-priming performance long-term after the initial prime, greatly simplifying operation.
Dual-Channel Sealing System
Equipped with a combined mechanical and lip seal arrangement featuring silicon carbide/graphite seal rings, it ensures reliable sealing when handling corrosive media. It also supports dry-run protection to prevent damage from idling.
II. Performance Advantages
Wide Operating Range
With a flow rate of 0.5–25 m³/h and a head range of 10–50 meters, it meets diverse needs ranging from domestic water supply to industrial processes. Its modular design allows for the use of various materials for wetted parts (such as 304/316L stainless steel or cast iron with fluoroplastic lining), making it suitable for clean water, mildly corrosive liquids, and complex media containing trace particulates.
Integrated Intelligent Control
It comes standard with an automatic pressure control system; a built-in pressure sensor enables precise pressure regulation between 0.2 and 2.5 MPa. Variable frequency drive (VFD) technology reduces energy consumption by 35% compared to traditional self-priming pumps, enabling on-demand energy delivery.
III. Engineering Application Features
Environmentally Friendly Design
Operating noise is kept below 65 dB (measured at a distance of 1 meter), and vibration levels comply with ISO 10816-3 standards. With an IP54 protection rating, it is suitable for outdoor environments characterized by humidity and dust.
Ease of Maintenance
A "back pull-out" design allows for impeller inspection without disconnecting the piping. Features such as a visual oil sight glass and a quick-drain valve simplify routine maintenance. Core components are standardized to ensure the global availability of replacement parts.
IV. Safety Protection System
Motor Overheat Protection: Built-in PTC temperature sensor for real-time monitoring of winding temperature.
Explosion-proof Version: ATEX-certified explosion-proof models suitable for flammable and explosive environments.
Automatic Air Venting: Integrated exhaust valve at the top of the pump body to prevent air locking.
V. Typical Application Scenarios
Residential: Villa water supply boosting, solar water heating system circulation, garden irrigation.
Commercial: Firefighting pressure boosting systems, HVAC cooling water circulation, swimming pool water treatment.
Industrial: Chemical process fluid transfer, electroplating solution circulation, equipment cooling systems.
This product series holds international certifications such as CE and ISO9001 and offers optional features like smart remote control and remote monitoring, marking the evolution from traditional water pumps to intelligent fluid solutions. Its patented self-priming design (Patent No. ZL201710832XXX) reduces the unit's size by 20% while maintaining high performance, pioneering the technology for compact self-priming pumps. Construction
Vortex self-priming pump
High-efficiency IE motor (energy-saving)
Self-priming capability; easy installation and startup
Prevents frequent starting and stopping (models …-S…A)
Automatic on/off operation for enhanced operational safety (models …-S…A)
Applications
Tank water supply
Tank spraying
Tank irrigation and watering
Tank rainwater harvesting
Equipment/Features
Directly flanged motor
Thermal motor protection switch for 1~230 V models
Pressure switch and pressure vessel for automation and protection (models PW-…S…A)
Model Code
Example:
|
示例： |
Wilo-PWS-C202SMA |
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PW refers to Wesco water pumps. |
Pump type |
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… denotes self-priming, N denotes non-self-priming, and S indicates the inclusion of a volumetric flow switch. |
Structural properties |
|
S stands for plastic, and C stands for coating. |
Functional or material properties |
|
20 × 10 = 200 W |
Output power/10 |
|
2 Refers to the third generation. |
Series Number |
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S stands for small, N for normal, and L for large. |
Water storage tank dimensions |
|
E stands for 50 Hz, and M stands for 60 Hz. |
frequency |
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"A" stands for "Automatic." |
Automated equipment |
Technical Data
Mains connection 1~230 V, 50 Hz (for models …E)
Mains connection 1~220 V, 60 Hz (for models …M)
Connections (discharge and suction sides): 1" to 1 ½" – depending on model
Fluid temperature +5 °C to +40 °C
Fluid temperature 5 °C to 60 °C [for PB-…S…A]
Ambient temperature 0 °C to +40 °C
Storage temperature -20 °C to +60 °C
Max. inlet pressure: 0.7 bar to 1.4 bar – depending on model
Max. discharge pressure: 2.9 bar to 5.0 bar – depending on model
Cut-in pressure: 1.1 bar (PW-175SEA only)
Cut-out pressure: 1.8 bar (PW-175SEA only)
Cut-in pressure: 1.6 bar (PW-252SEA only)
Cut-out pressure: 2.4 bar (PW-252SEA only)
Enclosure class (1~): IPX4
Materials
Pump housing: EN-GJL-200
Impeller: Brass
Terminal box cover: ABS
Impeller shroud: Brass
Shaft: Stainless steel 1.4006
Mechanical seal: Carbon/Ceramic
Factory settings
Pump
Installation and operating instructions
Accessories
None
