Liquid or slurry never touches stem threads.
液体或泥浆绝对不会接触阀杆螺纹。
Position by the valve stem threads are divided into clear and dark bar bar gate valve two...
按阀杆的螺纹位置划分，可分为明杆闸阀和暗杆闸阀两种。
After the reconstruction of the tangential separator good performance, stable operation, ensure the smooth production fo stem threads.
改造后的切向分离器性能良好，运转稳定，保证了梗丝生产的顺利进行。
Press down on knob and turn clockwise one full turn to properly engage threads on stem boss.
将旋钮压下，顺时针旋转一整圈，使其完全嵌入到阀杆轮箍的螺纹里。
When the upper stem rides up and down on its threads it now moves the lower stem by a mechanical connection.
当上阀杆沿着它的螺纹上下运动时，通过机械连接带着下阀杆一起运动。
The threads on the lower valve stem are in the wetted gas stream.
下阀杆上的螺纹是处在潮湿气流中的。
This invention discloses a sewing machine having stem to be driven to perform longitudinal movement; wherein the stem can be fixed with sewing needle for guiding threads.
本发明涉及一种缝纫机，该缝纫机具有可驱动以上下运动的针杆，该针杆上可固定缝纫针以用于引导针线。
This invention discloses a sewing machine having stem to be driven to perform longitudinal movement; wherein the stem can be fixed with sewing needle for guiding threads.
本发明涉及一种缝纫机，该缝纫机具有可驱动以上下运动的针杆，该针杆上可固定缝纫针以用于引导针线。
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