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Product Description
The WFB series sealless automatically-controlled self-priming pump is a new product resulting from the improvement and innovation made on the basis of the advanced experience learned from domestic and international related products by our company, and also is an alternative of domestic conventional similar products. The product is featured with the functions and advantages such as temperature resistance, pressure resistance, wear resistance, “first drainage, permanent self- priming”, etc. It is the most ideal alternative to conventional WFB type unsealed self-priming pumps, long shaft submerged pumps, submerged pumps, submerged sewage pumps, etc., and widely used in industries such as petroleum, power, chemicals, steels, medicine, coking, electroplating, environmental protection, fire protection, municipal water purification, national defense and military industry, textile printing and dyeing, mining and mineral processing, and civil construction, and has won high praise from the users.
Product Features
1.The use of a “chain type” multi-face centrifugal dynamic sealing device for pump has eliminated the needs for stuffing box sealsand mechanical seals of the conventional water pumps, which completely overcomes the problem of water leakage.
2.High reliability. The sealing device is not subjected to friction during operation, and its service life is more than 10 times longer than similar products.
3.Transplantation of principle of vacuum pump ensures that the self-priming performance is stable and reliable. At the moment of pump shutdown, the electric-actuated air control valve located at the inlet opens quickly, which allows the outside air to quickly enter the suction pipeline, terminates the siphon phenomenon of water to the inlet pipeline, and ensures that sufficient water is available in the pump chamber for self-priming during the next pump startup, truly achieving “first drainage, permanent self-priming”. It is an integrated product of mechanical, electrical and instrumentation.
4.Low vibration and noise, flexible mobility, easy to disassemble and install.
5.Superior automatically-control function ,which can be used in conjunction with high-tech fields and highly automated systems.
6.Various materials,e.g., cast steel and stainless steel are available depending on the medium.
7.The centrifugal dynamic seal adopts optimized design to minimize energy consumption and improve overall efficiency while meeting sealing requirements.
8.Optimization of the hydraulic model has improved hydraulic efficiency, reduced shaft power, and has significant energy-saving advantages.
9.When the pump is shut down, the check valve at the pump outlet quickly closes to prevent water from flowing back in the pipeline and overflowing through the gap at the auxiliary impeller, which may damage the motor, so as to make it suitable for application requiring frequent startups.
10.The diffuserdesign with special structure, which acts as several exhaust fans, enhances the pumping capacity, and has the outstanding feature of quickly completing the self-priming. Compared with conventional WFB pumps that use pumping chamberwith single volute, the self-priming time is shortened by more than one-third to half.
Rangeof Performance
Speed: 2960 r/min, 1480 r/min
Inlet/Outlet Diameter: 50 mm to 400 mm
Rated Flow: 5.6 to 1600 m3/h
Rated Head: 10 m to 125 m
Self-Priming Height: 4 m to 6 m (under pressure at room temperature)
Ambient Temperature: ≤ 40°C
Temperature of Medium: <50°C
Rangeof Performance
Speed: 2960 r/min, 1480 r/min
Inlet/Outlet Diameter: 50 mm to 400 mm
Rated Flow: 5.6 to 1600 m3/h
Rated Head: 10 m to 125 m
Self-Priming Height: 4 m to 6 m (under pressure at room temperature)
Ambient Temperature: ≤ 40°C
Temperature of Medium: <50°C
Frequently Asked Questions
Yes. The pump chamber must be filled with liquid before initial startup. After operation, the retained liquid supports the next self-priming cycle.
Under standard conditions, the self-priming height is approximately 4–6 m. Actual performance depends on liquid temperature, suction pipe length, airtightness, and installation height.
Air leakage reduces the vacuum level, causing longer priming time, insufficient flow, or failure to draw liquid.
The pump uses a centrifugal dynamic sealing system. During operation, the auxiliary impeller creates pressure balance, reducing leakage associated with packing or mechanical seals.
The discharge check valve closes quickly to reduce liquid backflow, while the air control device breaks the siphon and retains sufficient liquid inside the pump chamber.
Material selection should be based on the liquid’s corrosiveness, solid content, temperature, and operating conditions. Cast steel and stainless steel options are available.
