1. Produktuen diseinua 2. Moldeak egitea 3. Balbula-galdaketa eta forjaketa
(1) Foundry casting: The earliest production mode in the field of valves, because the casting type does not have enough pressure, the valve produced by this process is easy to produce sand holes, leading to product leakage and a series of problems. (2) Forjatze beroko forja: forjatuz moldatutako gorputzak ez du trakoma izango, itxura ederragoa. 1. Harea lehertzea 2. Metalgintza 3. Osagarrien muntaketa 4. Produktuaren presioaren proba 5. Ontziak eta zigilua
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