Flap valve cover seals are required when there is carbide reactor welding, sealing surface with thread sealing, to ensure the reliability of sealing and prevents scarring.

阀瓣密封根据需要时封面均堆焊接有硬质合金，密封面采用线密封，保证密封的可靠性，并可防止结疤。

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The makeup torque, rounds and rotary rate, as well as thread sealing grease and thread processing precision are all important elements affecting connection quality of casings.

紧螺纹的扭矩、圈数及转速和螺纹密封脂、螺纹加工精度等都是影响螺纹联接质量的重要因素。

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Thread sealing: binding method using meltable threads as "stitches" to secure individual and gathered sections. the thread of adhesive nature are place on the folding machine .

融线装：用可以融化的线，把个别书帖及检集后各帖连接一起的装订方法。线是有粘性的，放于折纸机上。

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