Maintenance rules for forged steel valves When maintaining valves, pay attention to the water inflow problems in the electric head and its transmission mechanism. Especially the rain that infiltrates during the rainy season. One is to rust the transmission mechanism or the transmission bushing, and the other is to freeze in winter. The torque caused by the operation of the electric valve is too large. Damage to the transmission components may cause the motor to be unloaded or the over-torque protection may not be electrically operated. The drive components are damaged and manual operation is not possible. After the over-torque protection action, the manual operation also fails to switch. For example, forced operation will damage the internal alloy parts.
Both steel and iron are iron-based alloys with carbon as the main additive element, collectively referred to as iron-carbon alloys.
The cast pig iron is smelted in a molten iron furnace to obtain cast iron (liquid), and the liquid cast iron is cast into a casting, and the cast iron is called a cast iron piece.
Where is the difference between cast steel and carbon steel. First, steel is classified by chemical composition.
(1) Carbon steel: a. low carbon steel (C ≤ 0.25%); b. medium carbon steel (C ≤ 0.25 ~ 0.60%); c. high carbon steel (C ≤ 0.60%).
Steel is classified according to the forming method: (1) forged steel; (2) cast steel; (3) hot rolled steel; (4) cold drawn steel.
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