To order, specify description and extension length from center line of valve to top of handwheel or nut.
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。
Beneath the handwheel is one set of wrench flats on a nut threaded into the valve body. This is the diaphragm-retaining nut.
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。
Rotate the handwheel driving the pole and nut reciprocate in horizontal. At the same time the seal can prevent dust from entering driving body and out-leakage pollution does not exist.
转动手轮使丝杆带动丝杆螺母和闸板沿水平方向往复运动，达到闸门的启闭目的，同时密封副在闸板运动中阻拦粉尘不进入传动腔内，无外漏污染。
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