Which of the following is NOT a factor involved in valve selection?

The selection of valves for any engineering application is based on various technical and practical factors to ensure optimal performance and reliability. Economics is pivotal as it dictates the budget constraints and cost-efficiency of the valve choice. Corrosion resistance is crucial as it affects the material selection based on the chemical properties of the fluids in the system; valves must withstand the operating conditions without deteriorating. Valve lifespan is another significant factor because it relates to the durability and maintenance needs of the valve, which can impact operational efficiency and costs over time.

In contrast, color blindness is not relevant to valve selection. While color coding may be used for identifying systems or valves in a plant, it does not affect the performance, compatibility, or functionality of the valve itself. Thus, color blindness does not have a bearing on the considerations an engineer must account for when selecting a valve for a system.