Fault phenomenon: water and steam on the valve body.
1) The quality of the valve is not good.
2). Valve casting failed.
1). Use a flat spade to remove trachoma and perform repair welding.
2). For cast iron valves, drill holes can be used to install wire plugs.
3). Check the depth of the crack carefully, remove the crack and repair the weld.
Strict control, purchase verification, quality assurance, regular inspections.