In fabricated valves, leakage of corrosive medium due to neglected maintenance on the packing, or line pressure surges causes corrosion and failure of most carbon steel or cast iron components.

• 锻钢焊接装配阀门，常会由于忽视了填料的维护而导致腐蚀介质的泄漏，或管路压力波动导致腐蚀和大部分碳钢或铸铁部件损坏。