Question

Which one of the following valves are best suitable for corrosive liquids?

• A. Diaphragm valve
• B. Rotary plug valve
• C. Ball valve
• D. Butterfly valve

Hint:

For corrosive or chemically aggressive fluids, always consider rotary plug valves due to their robust design and ability to be coated with corrosion-resistant materials.

Answer 1

The Correct Option is B

When dealing with corrosive liquids, the valve material and internal design must ensure chemical resistance and durability over time.
Rotary plug valves are often preferred for such applications because:
- They have a tight shutoff capability
- They offer excellent control for corrosive and viscous fluids
- They can be lined with corrosion-resistant materials like PTFE or special alloys
Let us analyze the other options:
- Diaphragm valves are indeed corrosion-resistant and used for corrosive fluids, but they are typically used in low-pressure, low-temperature applications.
- Ball valves provide good shutoff but may not offer the same level of control or corrosion resistance as rotary plug valves unless specially designed.
- Butterfly valves are generally used for non-corrosive or less aggressive fluids and are not optimal for highly corrosive media.
Thus, for a combination of corrosion resistance and flow control in industrial applications, the Rotary plug valve is considered best suited.