1, the cast iron casting quality is not high, there are sand holes on the body and cover, loose organization, slag defects such as 2, day frozen crack; 3, poor welding, there is a slag, no welding, stress crack defects such as 4 damage after being hit by heavy, cast iron Industrial Valves elimination method: 1, improve the quality of casting, before installation in accordance with the provisions of strength test; 2, to temperature below 0 ° and 0 ° valve, should be insulated or hot, stop using the Industrial Valves should be ruled out water. 3, composed of the body and cover welding seam, should according to the relevant welding procedures, also should carry on the inspection and after welding strength test; 4, the Industrial Valves prohibited put heavy, do not allow the hammer impact non-metallic valves, cast iron and the installation of large diameter valves should be stand
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