What factors affecting pump valve material selection

1 Electrochemical corrosion:

In order to prevent electrochemical reflection of the medium, the same material is generally used for the flow path of the centrifugal pump.

2 temperature of the medium

The requirements for the material of the pump selected in the high temperature environment and the low temperature environment are different, because creep occurs at high temperatures, and the brittleness at very low temperatures generally has corrosion resistance at room temperature, which is not necessarily corrosion resistant at high temperatures. The ability to withstand high temperatures, so the material properties should meet the temperature requirements of the medium being transported.

3 high discharge pressure for single stage pump:

Single stage pump with a high discharge pressure has a high speed. For wetted components, it needs to have strong cavitation resistance and good erosion resistance.

4 Wear of solid particles:

For materials containing abrasive solid particles in the media, it is necessary to select high wear resistance materials.

5 scratch between materials:

For parts with relative movements such as bushings, bolts and nuts, impeller seal rings and pump seal rings, the hardness of the two parts should be different when selecting materials to avoid easy to scratch each other during loading and unloading and operation.

6 temperature difference on the same part:

When the temperature big difference of the same part during work, such as when the high temperature liquid is delivered, the pump cover is cooled, the temperature at the contact between the pump cover and the medium is high, and the temperature at the contact with the cooling water is low, and the expansion is small. Good material to avoid cracks due to different expansion during operation.

7 parts that need to be welded:

For parts that require repair welding during casting, processing and use, materials with better weldability are used. For example, the weldability of low carbon steel is better than that of high carbon steel.

8 Economical:

The material is different, the corresponding performance is different, and the corresponding product price is different. Therefore, when several materials can meet the requirements, the corresponding price should be relatively favorable but the product parts and process quality are compared.

9 Corrosion of the medium:

Different materials have different corrosion resistance. For example, 1Cr18Ni9 is resistant to medium or dilute concentrations of nitric acid or organic acids, but it is not resistant to dilute sulfuric acid or hydrochloric acid. Fluoroplastic materials can be used for various degrees of acid and alkali.