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电站用调节阀安装在锅炉给水管道上,起调节锅炉给水流量的作用。其公称压力为:2.5～250kgf/cm~2,最高工作温度是250℃,材质为 ZG25I(其结构见图1)。由于阀门在高温高压下工作,所以承压铸钢件技术条件规定,铸件内部不得有气孔、缩松,夹渣、裂纹等铸造缺陷。为此,在编制铸钢工艺时一般不使用内冷铁,也不允许用泥芯撑固定泥芯、采用两个阀体连成挑担式来解决泥芯固定问题。
Power station with the control valve installed in the boiler feed pipe, boiler feed water from the regulation of the role of flow. Its nominal pressure: 2.5 ~ 250kgf / cm ~ 2, the maximum operating temperature is 250 ℃, the material is ZG25I (its structure shown in Figure 1). As the valve work under high temperature and pressure, so the technical conditions of the pressure casting steel, castings may not have pores, shrinkage, slag, cracks and other casting defects. To this end, in the preparation of steel casting process generally do not use the internal cooling iron, mud core support is not allowed to hold mud core, using two valve body connected to pick-type to solve the mud core fixing problems.