The WFB Series Sealless Self-Controlled Self-Priming Pump addresses one of the most persistent challenges in industrial fluid handling: transferring corrosive chemicals without leakage, seal failure, or contamination. Engineered with corrosion-resistant alloy construction, this pump delivers reliable performance in petrochemical processing, acid recovery, and aggressive fluid transfer applications where conventional sealed pumps fall short.
Why Corrosion Resistance Matters in Chemical Transfer
Chemical processing facilities handle sulfuric acid, hydrochloric acid, alkali solutions, salt water, and various aggressive media that rapidly degrade standard cast iron or bronze pump components. The WFB series solves this through selectable alloy construction — cast steel or stainless steel wet-end parts that withstand prolonged exposure to corrosive fluids without pitting, cracking, or performance loss.
Key Technical Parameters
| Speed | 2960 r/min, 1480 r/min |
| Inlet/Outlet Diameter | 50mm – 400mm |
| Rated Flow | 5.6 – 1600 m³/h |
| Rated Head | 10m – 125m |
| Self-Priming Height | 4m – 6m (ambient pressure) |
| Medium Temperature | ≤ 50°C |
| Ambient Temperature | ≤ 40°C |
Sealless Dynamic Sealing Technology
The WFB pump eliminates traditional packing seals and mechanical seals entirely, replacing them with a multi-stage centrifugal dynamic sealing device. This design approach offers distinct advantages for chemical applications:
- No seal faces to corrode or wear from abrasive media
- No leakage paths for hazardous chemicals to escape
- Friction-free sealing operation extends service intervals
- Reduced maintenance exposure to toxic fluids
Permanent Self-Priming Mechanism
An electric air control valve at the inlet manages the priming cycle. During shutdown, the valve opens to admit air and break the siphon effect, preserving liquid in the pump chamber. On restart, sufficient water is available for immediate self-priming — no manual re-priming required. This ‘prime once, permanent self-priming’ capability reduces operator intervention in chemical plants where manual pump priming poses exposure risks.
Target Applications
- Petrochemical Processing: Transfer of refined products, intermediate chemicals, and process streams
- Acid Recovery Systems: Circulation and transfer of sulfuric, hydrochloric, and nitric acid solutions
- Electroplating Lines: Acid and alkali bath circulation with corrosion-resistant wet-end parts
- Pharmaceutical Manufacturing: Clean fluid transfer with stainless steel contact surfaces
- Wastewater Treatment: Handling of chemically treated industrial effluent
- Steel Industry: Acid pickling solution circulation and transfer
Material Selection Guide
The WFB series supports multiple alloy options depending on the medium:
- Cast Steel: General-purpose industrial fluids, moderate corrosion environments
- Stainless Steel: Strong acids, alkalis, pharmaceutical-grade and food-grade applications
Material selection should account for medium concentration, temperature, and presence of abrasive particles. Consult technical documentation for specific chemical compatibility data.
Installation Considerations for Chemical Service
- Do not support piping weight on pump inlet/outlet flanges — use independent pipe supports
- Ensure all pipe connections are gas-tight to maintain self-priming performance
- Install a 0.5–1 meter vertical pipe section at the outlet before any horizontal turn
- For crystallizing or precipitating media, drain the pump chamber through the drain port during extended shutdowns
- In freezing conditions, drain pump liquid or install trace heating to prevent casing damage
FAQ
Q: Can the WFB pump handle concentrated sulfuric acid?
A: Yes, with appropriate stainless steel material selection. However, do not use water for initial priming when transferring concentrated sulfuric acid — use the process medium or compatible liquid.
Q: How often does the dynamic seal need replacement?
A: The centrifugal dynamic seal has no friction faces, providing service life significantly longer than mechanical seals. Actual intervals depend on the medium and operating conditions.
Q: What is the maximum self-priming height?
A: 4–6 meters under ambient temperature and pressure conditions. Actual values vary with flow rate — lower flow rates achieve higher self-priming heights.
Q: Can multiple WFB pumps share a common suction line?
A: This is not recommended as it increases self-priming time and reduces self-priming height.
Why Choose Chaodun Pump
Chaodun Pump manufactures the WFB Series Sealless Self-Controlled Self-Priming Pump with full control over alloy selection, dynamic seal design, and self-priming mechanism engineering. Our technical team provides application-specific material recommendations and pump sizing to match your chemical transfer requirements. Contact us for detailed specifications and project consultation.