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21. 发明专利

JPS58180875A Deformation-preventing method for valve 失效
标题翻译：阀的变形预防方法
公开(公告)号：JPS58180875A
公开(公告)日：1983-10-22
申请号：JP6229482
申请日：1982-04-16
申请人： Hitachi Eng Co Ltd , Hitachi Ltd
发明人： SASAKI IWAO , FUJII TAKEJIROU , TAKESHIMA KIKUO , ODA SHINGO
IPC分类号： F16K1/42 , F16K1/34
CPC分类号： F16K1/34
摘要： PURPOSE:To prevent leakage from occurring at a valve seat of a water-steam two-phase boundary valve, by removing a plastically deformed part of the valve seat by heating the valve seat before fitting the valve into a plant. CONSTITUTION:A shut-off valve 10 provided in a residual heat recovering (RHR) system comprises a stem 14 inserted in a body 15 and a valve body 17 provided at a lower end part of the stem 14. In normal operation of a boiling water reactor, the valve body 17 makes contact with the valve seat 16, thereby preventing water B and steam A from making contact with each other. In a manufacturing step of the valve 10, a valve seat part of the valve 10 is heated to apply a heat load under the same condition as that in the operation of the plant. Then, the part is subjected to sliding machining, thereby removing the plastically deformed part. Accordingly, the thermal strain generated at a part subjected to a heat load in the succeeding use of the valve is made very little.
摘要翻译：目的：为了防止在水汽两相边界阀的阀座处发生泄漏，通过在将阀安装到工厂之前，通过加热阀座来移除阀座的塑性变形部分。构成：设置在残余热回收（RHR）系统中的截止阀10包括插入主体15中的杆14和设置在杆14的下端部的阀体17.在沸水的正常操作中阀体17与阀座16接触，从而防止水B和蒸汽A彼此接触。在阀10的制造工序中，在与工厂的运转相同的条件下，对阀10的阀座部进行加热，施加热负荷。然后，对该部件进行滑动加工，从而去除塑性变形部分。因此，在后续使用阀时在受热负荷的部分产生的热应变非常小。

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