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介绍了精铸阀体的特殊材质，精铸件的结构及工艺特点，所采用的精铸压型结构及其设计方法，并对使用状况作了简要评述。
The special material of cast - in valve body, the structure and technological features of the castings, the casting press - type structure and its design method adopted are introduced, and the usage status is briefly reviewed.