How are forged steel valves and cast steel valves manufactured?
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Hello, experts. May I ask how forged steel valves and cast steel valves are manufactured? Are cast steel valves made by creating a mold and pouring molten steel into it, while forged steel valves are produced by processing forged steel ingots using machine tools? I’ve never been to a valve manufacturing plant, and I searched online for a long time without finding any relevant videos. Could anyone please give me some advice? Thank you.
As you said: 1. The valve body is formed through casting or forging to produce the raw materials for components such as the valve body and valve cover; for other parts like the valve stem, rod materials are used. 2. The raw materials are processed through a series of mechanical operations, necessary heat treatments, corrosion-resistant layer cladding, non-destructive testing, and other processes to become work-in-progress items. 3. The components in process, fasteners, seals, etc., are assembled to form a complete valve. 4. The complete machine is shipped from the factory after undergoing pressure and sealing tests, as well as processes such as surface painting, labeling, and packaging.
Thank you for your guidance. Are forged valves produced by forging steel using molds, or are they made by processing steel ingots with lathes?
Forged valves are produced by forging or pressing using forging equipment; those with small diameters are generally die-forged, while those with large diameters or special valve bodies are free-forged.
Additional question: Are valves made using casting processes prone to porosity, which can cause sand leakage?