上阀杆通过丝口旋在横膈膜止动螺母里。
这是横膈膜止动螺母。
手轮下面是一个六角形外螺纹横膈膜止动螺母。
在手轮下面，在一个旋进阀体的螺母上面是一套扳手面。这是横膈膜止动螺母。
Beneath the handwheel is one set of wrench flats on a nut threaded into the valve body. This is the diaphragm-retaining nut.
构件失效的主要原因是：锁紧螺母的热处理工艺不当，止动垫电镀过程发生氢脆。
The results show that the failure is mainly attributed to the inappropriate heat-treatment technology of the locking nut and the hydrogen brittlement from electroplating of the stopping pad.
构件失效的主要原因是：锁紧螺母的热处理工艺不当，止动垫电镀过程发生氢脆。
The results show that the failure is mainly attributed to the inappropriate heat-treatment technology of the locking nut and the hydrogen brittlement from electroplating of the stopping pad.
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