When choosing the valve plate material for a double-flap wafer check valve, the main considerations are the medium properties of the use environment, operating conditions, economy and material durability. DI (ductile iron) and stainless steel 304 each have their own advantages and disadvantages, as follows:
Ductile iron (DI)
Advantages:
Low cost: Compared with stainless steel, ductile iron has a lower cost.
Good mechanical properties: It has high strength and toughness and is suitable for most ordinary industrial water and non-corrosive media.
Good wear resistance: It has good wear resistance in many applications.
Disadvantages:
Poor corrosion resistance: It is easy to corrode in an environment containing acid, alkali or other corrosive media.
Heavier weight: Compared with stainless steel, ductile iron is heavier and is not suitable for applications that require weight reduction.
Stainless steel 304
Advantages:
Strong corrosion resistance: Suitable for a variety of corrosive media, including acid, alkali and salt solutions, especially in the chemical, marine and food industries.
Good high temperature resistance: It can still maintain good mechanical properties in high temperature environments.
Long life: Due to its strong corrosion resistance, it usually has a long service life.
Disadvantages:
High cost: The price of stainless steel 304 is higher, and the initial investment is larger.
Relatively low mechanical strength: Although it has good corrosion resistance, its mechanical strength and toughness may not be as good as ductile iron.
Selection suggestions:
Ordinary industrial water and non-corrosive media: If the application environment mainly involves ordinary industrial water or non-corrosive media, ductile iron can be selected to reduce costs.
Corrosive media and special environments: If the application environment involves corrosive media (such as acid, alkali or salt solution), it is recommended to choose stainless steel 304 to ensure the long-term durability and reliability of the valve.
High temperature environment: In high temperature applications, stainless steel 304 performs better.
In general, the use conditions, media characteristics and economic budget of the valve need to be considered comprehensively when selecting materials. Weigh them according to the specific situation to ensure the best performance and cost-effectiveness.