【正文】 is the petroleum chemical industry refines oil in the installment the essential part, its use adjustment valve type many, quantity big, in the chemical production medium many is corrosiveness strong, virulent or is flammable explosive, when adjusts the valve divulges, not only can create the serious raw material, the energy and the product waste, moreover also has the serious influence to the environment, even causes the serious security accident.. Therefore, we have the necessity also to have to take in the petroleum chemical industry production process to adjust the valve to divulge the question. Under causes the reason on the petroleum chemical industry installment in which the adjustment valve packing box divulges as well as prevented divulges the countermeasure, the method with the elimination makes the key discussion.2 adjustments valves packing box divulges the reason analysis adjustment valve divulges divides into two kinds, namely outside divulges with the interior divulges. In the majority situation, outside divulges the consequence which creates, often divulges pared to the interior seriously.In the industrial production, adjusts the valve outside to leak not only creates the raw material and the energy waste, but also can directly pollute the environment, even causes the fire, the detonation, is poisoned and so on the harm safety significant accident, the national economy creates the heavy loss for. Outside but the packing box divulges also belongs leaks. The packing box divulges reason: The packing box by the stuffing box, the padding, the padding pad as well as the padding contracts the organization and so on to be posed. The stuffing box sets on the valve body or the valve cover, plays holds the padding the role. The padding pad sets to the stuffing box base, plays the strut padding role. The padding divides the soft nature sealing pound and takes shape the padding two kinds. Takes shape the padding take the elastic material quality as the raw material, uses the mould pressing to take shape or the turning processing makes each kind of joiner curtain under, pares, takes shape the padding structure pact, sealing property good, the serviceability is stronger. The medium divulges in the sealing pound place, the reason bees less crowded, the sealing pound for the padding gland is not strict, the padding variety or the quality does not conform to the requirement, the padding gets older or by the valve lever attrition. 3 adjusts the loss which the valve divulges creates Divulging causes which by the above situation, creates the economic loss and further because the medium characteristic different has differently to the environment pollution degree. If is the gas medium, then very easily proliferates the dissemination in the air, its pollution radius can be bigger. The liquid medium can through have the pollution to the ground seepage, also possibly or the exile expels flood water the ditch through the open ditch, pollutes the rivers and streams lake and other environment. Former Soviet Union39。因此，我們有必要也應當重視石油化工生產過程中調節(jié)閥門的泄漏問題。目前在國內采用單一柔性石墨環(huán)填料的情況比較多；而在國外，采用柔性石墨環(huán)填料組合的使用方法已開始流行，并且取得了良好的效果。統(tǒng)計數(shù)據(jù)表明，工業(yè)裝置中約20%的調節(jié)閥門存在泄漏問題，所造成的直接經濟損失約占總損失的5%0在石化行業(yè)中，以一套5000kt/a規(guī)模的常減壓裝置為例，一般情況下有5000個左右的調節(jié)閥門，由其中20%的調節(jié)閥門泄漏所造成的經濟損失和對環(huán)境造成的污染的確不可小覷，如果從整個石化行業(yè)來看，情況就更嚴重了。填料墊置于填料箱底部，起支撐填料的作用。查閱大量資料的習慣及方法。K—刀具鈍化系數(shù), 。， ， 則：=（2） 2Z=， Z=f=v=80m/min計算切削工時， ， 則：=（3） 細鏜孔至mm由于細鏜與精鏜孔時共用一個鏜桿，利用金剛鏜床同時對工件精、細鏜孔，故切削用量及工時均與精樘相同。確定進給量f:根據(jù)《切削用量簡明手冊》（第三版）（以下簡稱《切削手冊》,當?shù)稐U16mmX25mm, a=2mm時,以及工件直徑為ф160時。毛坯為實心。兩相比較起來可以看出，由于零件的端面尺寸不大，應車削端面，在中批生產中，綜合考慮，我們選擇工藝路線二。工序Ⅲ 鉆ф30孔、擴ф32孔，锪ф43孔。 基準面的選擇基面的選擇是工藝規(guī)程設計中的重要工作之一，基面選擇的正確與合理，可以使加工質量得到保證，生產率得以提高。 ,培養(yǎng)學生樹立工程技術必備的全局觀點,生產觀點和經濟觀點。） 精基準的選擇按照有關的精基準選擇原則（基準重合原則；基準統(tǒng)一原則；可靠方便原則），對于本零件，有中心孔，可以以中心孔作為統(tǒng)一的基準，但是隨便著孔的加工，大端的中心孔消失，必須重新建立