或由于钢杆变形根本就上下活动不自由。
Or simply because the upper and lower steel bar deformed activities are not free.
youdao
这种阀门应该是黄铜阀体，不锈钢阀杆和弹簧。
Valve shall have a brass body and stainless steel stem and spring.
结合了不锈钢和钨的杆头。
Combination of the head of stainless steel and tungsten.
应用推荐
模块上移
模块下移
不移动