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The proper selection of chemical control valves is essential to ensure efficiency and safety in industrial processes. However, mistakes are often made during this stage, leading to operational failures, increased maintenance costs, and safety risks. Below are some of the most common errors in selecting these valves and how to avoid them.

1. Not Considering Fluid Properties

Each fluid has specific characteristics such as viscosity, temperature, pressure, and chemical composition. Ignoring these properties when selecting a valve can result in issues like leaks, corrosion, or system failures. It is crucial to understand the fluid’s characteristics before choosing the appropriate valve.

2. Ignoring Operating Conditions

Pressure, temperature, and fluid type are crucial factors influencing a valve’s durability and performance. Selecting a valve without verifying its ability to withstand specific system conditions can lead to premature failures.

3. Incorrect Valve Type Selection

There are various types of control valves, including globe, butterfly, ball, and three-way valves, each designed for specific applications. Choosing the wrong valve type for a process can compromise system efficiency. For instance, globe valves are ideal for applications with high-pressure drops and where precise control is required.

4. Improper Sizing

Incorrect valve sizing can cause noise, vibrations, and premature wear. It is essential to calculate the flow velocity for maximum capacity and select the correct valve diameter to prevent these issues.

5. Overlooking Pressure Recovery and Associated Phenomena

Factors such as pressure recovery, cavitation, and flashing can affect valve performance. Ignoring these aspects can lead to damage and system failures. It is crucial to consider these phenomena during valve selection and sizing.

6. Not Evaluating Construction Materials

The compatibility of valve materials with the fluid is critical to avoiding corrosion and ensuring a long service life. Selecting inappropriate materials can compromise system integrity. It is important to assess the chemical and mechanical resistance of materials based on the fluid and operating conditions.

7. Lack of Proper Maintenance and Monitoring

Even a correctly selected valve can fail without proper maintenance. Implementing preventive maintenance programs and monitoring valve performance is essential to ensure optimal operation and extend its lifespan.

Conclusion

The correct selection of chemical control valves is fundamental to the success of industrial processes. Avoiding the common mistakes mentioned requires a deep understanding of operating conditions, fluid properties, and available valve characteristics. Additionally, implementing proper maintenance practices is crucial to ensuring long-term system efficiency and safety.