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I. Overview: The WFB series of sealless, automatically controlled self-priming pumps are innovative products that fill a gap in the domestic market. These pumps feature capabilities such as resistance to high temperatures and pressures, \"one-time priming,\" and lifelong self-priming. Currently, a range of complete machines is produced in various materials such as stainless steel, reinforced polypropylene, cast steel, and cast iron, offering more than 1,000 different specifications in five distinct designs. It is widely used in industries such as electronics, electricity, chemicals, metallurgy, pharmaceuticals, food processing, electroplating, environmental protection, firefighting, municipal services, water purification, defense and military industry, textiles and dyeing, mining and ore processing, and civil construction, and has received high praise from users. II. Unique Advantages 1. It adopts a \"cascaded multi-face centrifugal sealing device for pumps\", eliminating the packing seals, ring seals, and mechanical seals used in traditional water pumps; it completely eliminates problems such as leakage, spills, and drips. It is the ideal replacement for various conventional long-shaft submersible pumps, submersible pumps, and sewage submersible pumps. 2. During operation, the sealing device does not experience friction or wear, resulting in a service life that is more than 10 times longer than that of similar products. 3. Adopting the principle of a vacuum pump, it features stable and reliable self-priming performance; in particular, the use of an \"electric air control valve\" ensures true \"one-time priming for lifetime self-priming\". 4. Low vibration, low noise, flexible movement, easy to disassemble and install, and does not require foundation fixation. 5. It features excellent self-control capabilities and can be used in conjunction with high-tech fields and highly automated systems. III. Usage characteristics of different shapes: Rectangular and conical shapes offer you various options for installation ； The explosion-proof version is suitable for flammable and explosive environments ； The outdoor model, thanks to its secure three-dimensional outdoor cover, provides effective protection against rain, fog, moisture, and humidity when used in outdoor environments ； The cart-mounted type allows the water pump to be moved to the work station where it is needed for use. IV. Regarding the power of the accompanying motor: To select an appropriate motor, we draw on the advanced experiences of developed countries and classify water pumps into three performance levels: A, B, and C. If used under B or C grade operating conditions, the power of the accompanying motor can be reduced accordingly based on the specific circumstances. The Class A operating conditions are: continuous operation, with the suction lift, flow rate, and head all having to meet the specified requirements (the standards set for the selected model) ； The Class B operating condition is: continuous operation, with only two out of the three performance criteria needing to be met ； The Class C operating condition is: continuous operation, with only one of the three performance criteria needing to be met ； V. Selection Method (1) Meanings of 1-5 in the \"Category Code\" column of the performance parameters table: Type 1 is rectangular, Type 2 is conical, Type 3 is explosion-proof, Type 4 is for outdoor use, and Type 5 is designed for movement on a trolley. “In the “Material Symbol” column, the four groups of letters T, G, PP, and BXG represent iron, steel, reinforced polypropylene, and stainless steel (1Cr18Ni9Ti), respectively. (2) Examples of the meaning of model numbers: 50 WFB-AD1 – 50 refers to the suction diameter in mm; WFB denotes a seal-less self-priming pump; AD1 indicates the performance category. (3) The complete format for writing model numbers. Assume the requirements for the water pump are: a trolley-mounted design, made of reinforced polypropylene, with a suction diameter of 50 mm, and classified as AD1 in terms of performance. The full model of this water pump is “5PP50WFB-AD1”. (4) The flanges of the water pump are manufactured in accordance with the **standards of the People’s Republic of China. Standard code GB9115.2-88 ； GB9115.3-88。 Flange pressure for non-metallic material water pumps: 0.6 MPa ； The flange pressure of the metal water pump is 1.0 MPa. When our company’s water pumps leave the factory, an anti-flange is provided at both the inlet and outlet ports.