AODD pump introduction

AODD pump is commonly used in industry, positive displacement reciprocating pump, a wide range of applications, easy to use and maintenance. However, some users still reflect that the use of diaphragm pump effect has not reached expectations, the use of Air operated double diaphragm pump accessories easy to damage and other problems. In addition to buying low-quality products, some of these problems are caused by not choosing the most suitable model in the selection. Choose a diaphragm pump suitable for working conditions, the main consideration needs to consider the material, flow, suction, head, particle size, temperature, viscosity and other factors, the following is one for you to answer.

1. First to determine the material of diaphragm pump, common pump body material are: cast steel, ductile iron, aluminum alloy, stainless steel (304/316/316L), plastic PP polypropylene, fluorine plastic (PVDF), according to the nature of the material to choose. Non-corrosive materials generally choose cast iron, ductile iron or aluminum alloy material, corrosive liquid according to the degree of corrosion, choose stainless steel, plastic or fluorine plastic material. Refer to the corrosive parameter table of the material. In the case of uncertainty about material characteristics, it is recommended to choose the same material as the conveying pipe. If the temperature of the material is high, it is recommended to use stainless steel and perfluorinated diaphragm pumps. If the material has hard particles, it is recommended to use metal diaphragm pumps. After selecting the material of the pump body, the vulnerable parts of the diaphragm pump should be selected, which is also crucial to the use experience. The vulnerable parts of diaphragm pump refer to diaphragm, ball and tee. The material is divided into three ways, Teflon, polyether, super Teflon, etc., which should be selected according to the corrosivity, wear and temperature of the material.
2. Determine the size of the diaphragm pump model, which can be selected according to the flow rate or caliber. The marked flow rate of pneumatic diaphragm pump refers to the clean water test value under the drive of 7 kg of stable compressed air, under the condition of 0 suction and 0 head. The actual flow rate should be estimated according to the working condition (suction and head will affect the flow, you can refer to the flow curve diagram or ask the manufacturer to determine). Try to choose flow and pipe diameter matching diaphragm pump, but if the caliber and flow do not match the case, also can be installed in the inlet and outlet reducer joint (reducer will affect the diaphragm life and flow, so the scope of reducer should not be too large). Pneumatic diaphragm pump belongs to the positive displacement pump, low shear of the material, can transport materials with particles, but the size of the particles must be less than the maximum diameter of the pump through the particles, too large particles need to be filtered before pumping.
   3 pneumatic diaphragm pump can transport the following 10000 cm of viscous materials, but the transport of more viscous materials, should choose a larger than the required flow of the diaphragm pump, because the pneumatic diaphragm pump flow data are water test to calculate, viscous material resistance is greater to reduce the flow.
3. When conveying materials with high health grade requirements for food or medicine with diaphragm pump, sanitary diaphragm pump of stainless steel should be selected. Because the inner and outer walls of the sanitary pneumatic diaphragm pump use mirror polishing, no dead point, easy to disassemble and clean, ordinary pneumatic diaphragm pump from the design can not meet the requirements of the sanitary grade.