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Situation of Cast Iron Gate Valve Damage

Cast iron gate valve damage are mainly subject rust, because cavity contact with the media, rust is very serious, the diameter of corroded valve becomes small, the flow resistance increases, affecting the transmission medium. And more gate valves installed on the ground or underground, surface contact with the air, the air is humid, the surface prone to corrosion. The main material of the valve needs to be protected to extend the service life.

移动暴龙捕鱼On the other hand, since the cast iron contact with water directly, the presence of corrosion lead to secondary pollution for water quality, which must be controlled. Therefore, the coating is asked to functional protection as a focus and decorative as supplement.

Valve surface treatments mainly have paint coating, galvanizing and powder coating, paint protection is short. Galvanizing process is mainly used in pipes, process is complex, pretreatment used the residue pickling, phosphating process, workpiece surface will have a residue, galvanized corrosion resistance can maintain three to five years. Powder coating has a coating thickness, corrosion resistance, erosion and other characteristics, it can meet the conditions of use of the water system.

Gate Valve

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