Wear due to erosion/corrosion on a valve is typically found in

• A. The valve seating area
• B. The valve body
• C. The valve disk
• D. All of the above

Answer: (D)

Erosion and corrosion wear happens on surfaces that contact flowing fluid and are exposed to its mechanical and chemical effects. In a valve, that means multiple areas can be affected because each surface meets the fluid and may interact with the disk during operation.

The seating area wears because the disk sits against it and movement, throttling, and any particulates in the fluid cause abrasion and erosive attack at the contact surface. The valve body is in the path of flow and often experiences flow-induced wear and chemical attack, especially near inlets, outlets, or restrictive zones where turbulence and velocity are higher. The disk itself endures direct flow impact and shear as it opens, closes, and passes by the seat, so its edge and faces are susceptible to erosion and corrosion as well.

Since all three surfaces can be exposed to the same damaging conditions, wear due to erosion and corrosion is typically found on all of them.