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.
这使得不用扳手，而是使用带手轮的螺母就可以进行连接。
This allows the connection to be made without a wrench, using a nut equipped with a hand wheel.
订购时，注明描述信息和从阀门中心线至手轮顶部或螺母的加长长度尺寸。
To order, specify description and extension length from center line of valve to top of handwheel or nut.
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