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译文： 硝化棉硝化工序即浓硝酸和浓硫酸混酸和棉纤维反应生成硝化棉，控制浓硝酸和浓硫酸混酸流量和棉纤维量的比例是保证硝化棉产品质量的关键。在硝化棉硝化工序自控系统的改造中，我们设计了一种新型的阀杆密封方式，成功地解决了调节浓硝酸和浓硫酸混酸流量控制阀的阀杆密封问题。 　　在聚四氟乙烯填料密封的上方，我们设计了一个空腔，并且给这个空腔中通入惰性气体（如氮气，也可以是空气），并且要求惰性气体的压力要稍高于管道中工艺介质的{zg}压力。这样，控制阀在使用过程中，即使控制阀的聚四氟乙烯填料密封被破坏，由于气体的压力要稍高于管道中工艺介质的{zg}压力，强腐蚀、易挥发、有毒有害的气体也无法泄漏出来。为保证空腔中气体的压力稳定，防止气体沿阀杆上下串气，在空腔的下部，把聚四氟乙烯填料分割为上下两部分，在中间加一不锈钢隔垫，将氟橡胶O型密封圈嵌入不锈钢隔垫内，隔垫上下用聚四氟乙烯填料将其夹紧。空腔上部的阀盖中也嵌入氟橡胶O型密封圈，用螺栓将阀盖压紧。一般来讲，氟橡胶O型密封圈的使用寿命是比较长的，高达上百万次，只要氟橡胶O型密封圈的密封不被破坏，空腔中惰性气体压力会始终高于管道中工艺介质的{zg}压力，因此，这种控制阀阀杆的密封结构形式是非常可靠的，也很经济。 “ Control valve stem of the new sealing method”是由中国控制阀网提供的国际阀门新闻，译文仅供参考。另外，中国控制阀网还提供相关产品搜索：控制阀型号、控制阀价格、控制阀技术、控制阀新闻、控制阀生产商等。 原文： NC nitrification process that is concentrated nitric acid and concentrated sulfuric acid and cotton fibers mixed reaction nitrocellulose, control, concentrated nitric acid and concentrated sulfuric acid mixed acid flow and the ratio of the amount of WBLX single eccentric manual wafer soft seat butterfly valvescotton fiber quality of products is to ensure that the key to nitrocellulose. Nitrification process in the NC automatic control system transformation, we designed a new type of stem seal and successfully resolved the regulator concentrated nitric acid and concentrated sulfuric acid mixed acid flow control valve stem sealing problem. In the PTFE packing seal at the top, we have designed a cavity, and to this cavity pass into the inert gas (such as nitrogen, can also be air), and require an inert gas pressure to slightly higher than the pipeline technique the maximum pressure medium. In this way, control valve during use, even if the control valve of PTFE packing sealWBGX\D372X wsingle eccentric wormed wafer type soft seat butterfly valves is damaged, due to pressure of the gas pipeline to be slightly higher than the maximum pressure in the process medium, strong corrosive, volatile, toxic and harmful gases can not be leak out. In order to ensure a stable cavity pressure of the gas to prevent the gas valve stem up and down along the string of gas, in the lower part of the cavity, the PTFE packing divided into upper and lower two parts, separated in the middle of a stainless steel pad, fluorine rubber O - Stainless steel ring embedded in every other pad, under pad compartment with PTFE filler be clamped. The upper cavity of the valve cover is also embedded in fluorine rubber O-ring, with the valve cover bolts to compress. In general, the fluorine rubber O-ring life is relatively long, up to a million times, as long as the fluorine rubber O-ring seal is FBGX\D342 Bi-eccentric wormed soft seat butterfly valvesnot damaged, the cavity in the inert gas pressure will always be higher than the process fluid pipe The maximum pressure, therefore, the control valve stem sealing structure is very reliable and very economic. 原文来源：http://www.1kongzhifa.com/