When selecting a rotor pump, the first and most crucial step is not to hastily consult product catalogs, but to precisely define and obtain all relevant selection parameters. This is because the robustness of the parameter foundation directly determines the reliability of the entire selection scheme.

(Bonve V-Port Cam Rotor Pump)

The primary consideration is the physical and chemical properties of the conveyed medium. The medium is not just a name like "water" or "oil"; its inherent characteristics are the decisive factors in selecting the pump material and structural type. It is essential to clarify the medium's corrosiveness, abrasiveness, toxicity, and whether it is prone to crystallization. For example, conveying concentrated sulfuric acid requires the use of high-silicon cast iron or special alloys; slurries containing hard particles necessitate consideration of wear-resistant materials like high-chromium alloys and may call for open impellers or special centrifugal pumps, reciprocating pumps. The density and viscosity of the medium directly affect the pump's shaft power and performance curve. High-viscosity media can significantly degrade the performance of centrifugal pumps, making positive displacement pumps potentially more suitable. Furthermore, the vapor pressure of the medium and its possible gas content are important bases for assessing the pump's susceptibility to cavitation.

The second category of core parameters comes from process requirements. Flow rate (Q) is the fundamental data for pump selection. The process side should provide normal, minimum, and maximum flow rates. During selection, the pump's rated flow rate should generally not be less than the system's maximum flow rate, or a safety margin of 1.1 to 1.15 times the normal flow rate can be taken. Head (H) refers to the pressure head required by the process system. Its calculation must be accurate, including the sum of pipeline resistance, elevation difference, pressure difference, etc. The pump's rated head is typically taken as 1.05 times the system's required head to overcome unforeseen resistances. Inlet pressure (Ps) and outlet pressure (Pd) not only affect pipeline design but also relate to the pressure rating of the pump casing and the selection of shaft seal type. The medium temperature (T) range needs to be clearly defined, as it relates to material thermal expansion, mechanical seal selection, and cooling system setup. Available Net Positive Suction Head (NPSHa) is a parameter that is extremely easy to overlook but of paramount importance. It must be greater than the pump's Required Net Positive Suction Head (NPSHr) with a safety margin; otherwise, the pump will experience cavitation, leading to performance degradation and component damage.

Third, on-site installation and operating conditions are equally important. Will the pump be installed indoors or outdoors? What are the ambient temperature and humidity? Is there an explosive hazardous area? These conditions determine the motor's protection class (e.g., IP55), explosion-proof requirements (e.g., flameproof motors), and whether insulation or heat tracing is needed. Is the operation continuous or intermittent? Conditions involving frequent starts and stops pose severe challenges to the pump's mechanical structure, seals, and motor.

Only after comprehensively and accurately collecting and analyzing the above three aspects of information—medium characteristics, process parameters, and site conditions—can the selection work be considered to have laid a solid data foundation. Only then can we proceed to the next step: selecting the appropriate type of pump.

Bonve pump always adheres to the philosophy of "Wholeheartedly Making Good Rotor Pumps," committed to providing global customers with customized conveying and mixing solutions. If you have technical inquiries, selection needs, case references, or other cooperation intentions related to Bonve rotor pumps, please feel free to contact us.  

Service Hotline: 0574-87588986 13586591794  

Official Website: www.bvpumps.com  

Business Email: market@bonvepumps.com  

We look forward to working with you to drive efficiency and innovation in industrial fluid transmission with precision technology.