Why are steel and cast iron plug valves unsuitable for corrosive media?

Date: 2025-12-31Views: 413

Due to the large contact area between the body and plug of the plug valve, significant torque is generated when rotating the plug. Surface corrosion rapidly compromises the sealing integrity of the closing mechanism and increases the torque required to operate the plug valve.

Steel and cast iron plug valves used for corrosive media shall be equipped with phenolic protective coatings and other plastic protective coatings.