Which two variables are critical in material selection for valves?

In the selection of materials for valves, understanding the process fluid and the temperature at which the valve will operate are critical factors.

The process fluid refers to the type of substance that will flow through the valve, which can include gases, liquids, or slurries. Each fluid type has specific chemical properties that can interact differently with various materials, such as corrosion resistance, wear, and compatibility. For instance, some fluids can cause rapid degradation of certain metals, making it essential to choose materials that can withstand these effects.

Temperature is another crucial variable, as it can significantly affect the physical and mechanical properties of materials. High temperatures may require materials that maintain strength and integrity under heat, while low temperatures may lead to brittleness in some materials. Additionally, temperature can influence the viscosity of fluids, potentially affecting flow characteristics and pressure drop across the valve.

By considering both the process fluid and temperature, engineers can ensure that the valve materials will perform reliably and safely in the intended application. This leads to more efficient operation and reduced maintenance costs over time.