WFB Series Sealless Self-Priming Pump Overview
The WFB Series Sealless Self-Controlled Self-Priming Pump represents a significant advancement in industrial fluid transfer technology. Developed through continuous innovation and integration of proven design principles, this pump series delivers reliable self-priming performance across a wide range of applications including petroleum processing, power generation, chemical handling, steel manufacturing, pharmaceutical production, environmental protection, and municipal water systems.
Designed as a superior alternative to traditional self-priming pumps, long-shaft submersible pumps, and submerged sewage pumps, the WFB series combines temperature resistance, pressure tolerance, and wear-resistant construction into a single integrated unit. Its signature capability — “prime once, self-prime permanently” — eliminates the need for repeated manual priming, reducing operator workload and improving system uptime.
Key Features and Advantages
Sealless Dynamic Sealing System
The pump utilizes an interconnected multi-face centrifugal dynamic sealing device, which eliminates traditional packing seals and mechanical seals entirely. This design addresses the common industry problems of leaking, dripping, and seal degradation. Since the sealing assembly operates without friction during normal running conditions, service life extends well beyond comparable products.
Stable Self-Priming Performance
By incorporating vacuum pump principles into the impeller design, the WFB series achieves consistent and reliable self-priming. When the pump stops, an electric air control valve at the inlet opens automatically, allowing ambient air to enter the suction line. This breaks the siphon effect in the intake pipe and ensures sufficient liquid remains in the pump chamber for the next startup — truly achieving “prime once, self-prime permanently”. This mechatronic integration means the pump can operate as part of a fully automated control system.
Low Vibration and Noise
Optimized hydraulic design and balanced rotating components result in reduced vibration and lower operating noise levels. The compact footprint allows flexible installation and repositioning, while the straightforward disassembly process simplifies routine maintenance tasks.
Automatic Control Capability
The WFB series integrates seamlessly with automated process control systems. Its self-regulating features enable coordination with sensors, PLCs, and SCADA systems, making it suitable for modern industrial automation environments.
Material Versatility
Depending on the conveyed medium, the pump body can be manufactured from cast steel, stainless steel, or other corrosion-resistant alloys. This material flexibility ensures compatibility with aggressive chemical media, high-temperature fluids, and abrasive slurries.
Energy-Efficient Sealing
The centrifugal dynamic seal has been optimized through computational fluid dynamics analysis to minimize power consumption while maintaining effective sealing performance. This optimization contributes to improved overall system efficiency.
Technical Specifications
| Parameter | Value |
|---|---|
| Rotational Speed | 2960 r/min / 1480 r/min |
| Suction/Discharge Port Diameter | 50 mm – 400 mm |
| Rated Flow Rate | 5.6 – 1600 m³/h |
| Rated Head | 10 m – 125 m |
| Self-Priming Height | 4 m – 6 m (at ambient temperature with pressure) |
| Ambient Temperature | ≤ 40°C |
| Medium Temperature | ≤ 50°C |
Model Designation
| Component | Meaning |
|---|---|
| 80 | Inlet Diameter (mm) |
| WFB | Sealless Self-Priming Pump |
| 50 | Rated Flow (m³/h) |
| 32 | Rated Head (m) |
Installation and Operation Guidelines
Initial Setup
Upon installation completion, fill the pump chamber with the intended medium through the “prime port” or the ball valve on the pump body to perform the initial prime. After this first priming operation, subsequent use requires no additional priming. Ensure the prime port cap is securely tightened or the ball valve is closed to prevent air leakage that would compromise self-priming performance.
Pipeline Considerations
Do not rest the weight of suction or discharge piping on the pump inlet/outlet flanges — use independent supports (provided by the user). All pipe connections must be tightly sealed to prevent air ingress, which directly impacts self-priming height and flow rate. Install a vertical pipe section of 0.5-1 meter at the pump outlet before making any directional bends.
Operating Precautions
- Verify that the pump shaft rotates freely before startup. Use jog mode to confirm the rotation direction matches the arrow mark on the pump body (clockwise when viewed from the motor end).
- When conveying liquids prone to crystallization or sedimentation, drain the pump chamber through the drain port if the pump will remain idle. Re-prime before the next startup.
- For outdoor winter installations, provide hot water or steam tracing, or drain the pump liquid to prevent freeze damage.
- Do not operate with the discharge valve closed for extended periods — this may cause pump vibration and liquid vaporization.
- Do not use the suction line gate valve for flow regulation — this can induce cavitation.
- Avoid continuous operation below 30% of design flow (unless a bypass pipe is installed) or above 120% of design flow (risk of cavitation and motor overload).
Self-Priming Height Correction
The published self-priming height values are measured under standard conditions (one atmosphere pressure, ambient temperature clean water). For installations at different altitudes or with different medium temperatures, apply the correction formula:
[Hs] = Hs – Hh – Ht
Where Hh is the difference between standard atmospheric pressure and local altitude pressure, and Ht is the difference between the vaporization pressure at the operating temperature and the vaporization pressure at ambient temperature clean water.
Application Scenarios
Wastewater Treatment Plants
The sealless design eliminates seal replacement cycles, making the WFB series well-suited for continuous-duty wastewater transfer. The self-priming capability allows the pump to be mounted above the liquid level, simplifying maintenance access and reducing the need for submerged installations.
Chemical Processing Facilities
Stainless steel construction options provide corrosion resistance for handling acids, alkalis, and organic solvents. The absence of mechanical seals removes a common failure point when processing aggressive chemical media.
Fire Protection Systems
The reliable self-priming function and automatic control integration make the WFB series appropriate for fire pump standby service, where rapid startup and consistent performance under emergency conditions are critical.
Why Choose Chaodun for WFB Self-Priming Pumps
Chaodun Pump manufactures the WFB Series Sealless Self-Priming Pump with rigorous quality control throughout the production process. Each unit undergoes performance testing before shipment, ensuring rated flow and head specifications are met. Our engineering team provides installation guidance and application-specific material recommendations to optimize pump selection for your operating conditions. With a product range covering flow rates from 5.6 to 1600 m³/h and heads from 10 to 125 meters, we offer configurations for diverse industrial requirements.
Frequently Asked Questions
What does “prime once, self-prime permanently” mean?
After the initial manual priming during first installation, the pump’s internal design and the electric air control valve at the inlet ensure that sufficient liquid remains in the pump chamber for every subsequent startup. No additional manual priming is required unless the pump has been drained or unused for an extended period.
Can the WFB pump handle corrosive chemicals?
Yes. The pump body can be manufactured from cast steel, stainless steel, or other corrosion-resistant alloys based on the specific chemical medium. Consult our engineering team for material selection guidance for your application.
What is the maximum self-priming height?
Under standard conditions, the self-priming height ranges from 4 to 6 meters. This value varies with flow rate (lower flow allows higher self-priming height) and must be corrected for altitude and medium temperature using the formula [Hs] = Hs – Hh – Ht.
Is the WFB pump suitable for automated systems?
Yes. The pump’s automatic control features enable integration with PLC systems, SCADA networks, and other industrial automation platforms. The electric air control valve and self-regulating functions support fully automated operation without manual intervention.
How does the sealless design compare to mechanical seals?
The centrifugal dynamic sealing device eliminates the need for traditional mechanical or packing seals entirely. This removes the common failure modes of seal wear, leakage, and periodic replacement. Since the sealing assembly operates without friction during normal running, service life typically exceeds that of comparable mechanically sealed pumps.