CN103629436B - 一种测量用管路截止阀的防腐密封工艺 - Google Patents
一种测量用管路截止阀的防腐密封工艺 Download PDFInfo
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Abstract
本发明公开了一种测量用管路截止阀的防腐密封工艺,包括:配制金属粉末及防腐涂料;对阀体内表面和阀杆外表面喷涂金属粉末、淬火处理、喷涂防腐涂料;安装密封圈、组装截止阀;对阀体外表面涂抹防腐涂料、包裹防腐胶带;检验等步骤。使该截止阀有效地防止了液体外漏,免受酸性化学品的腐蚀,保证阀体的正常工作,在截止阀应用于地下测量管路时可以起到防腐防潮的作用,而且更加的环保,并且可以延长截止阀的使用寿命。
Description
技术领域
本发明涉及一种测量用的截止阀,尤其是涉及一种测量用管路截止阀的防腐密封工艺。
背景技术
仪表阀门是一种管路附件。它是用来改变通路断面和介质流动方向,控制输送介质流截止阀能够耐受更大的压力,密封性能好,所以一般用于较小流量,较高压力的气体或者液体介质的密封,是一种可以精确调整的阀门。
在测量中,尤其在腐蚀性液体的测量,在测量管路中离不开截止阀的使用,现有的截止阀采用的防腐蚀措施只是在表面涂一层油漆,难以达到防腐蚀的目的,时间一长,截止阀依然堵塞,不能正常使用。
另外,由于一些测量管路置于地下,因此需要不仅仅在截止阀内表面进行防腐措施,在截止阀外表面也需要进行防腐措施,此时,防腐层应能与阀体紧密结合,防腐性能和耐化学腐蚀性能要好;由于是埋地安装,防腐层还应具备良好的防水性能,避免水汽渗透。目前国内主要采用聚乙烯胶粘带或无溶剂型液体环氧涂料防腐,这种防腐层的防腐、防水性能一般,与阀体表面贴合不紧密,易造成水汽渗透。
另外,由于针型阀的精确调整的特性,以及仪表测量的精确性要求,也需要截止阀具有很高的密封性,放置液体的外漏及内漏,保证流量的精确。
发明内容
本发明所要解决的技术问题是,克服现有技术的缺点,提供一种测量用管路截止阀的防腐密封工艺,使该截止阀具有密封性好,强度高,防腐蚀能力强以及寿命长的优点。
为了解决以上技术问题,本发明提供一种测量用管路截止阀的防腐密封工艺,包括如下步骤:
步骤1:配制金属粉末及防腐涂料;金属粉末的重量百分比组分为:Ni:50%、Cr:30%、Si:2.5%、S:0.3%、C:0.8%、Fe :7.1%,Mn:9%,V:0.3%;防腐涂料的重量百分比组分为:热固性丙烯酸树脂:40-45%,缩二脲多异氰酸酯:25-30%,耐磨颜料:8-10%,磷酸锌防锈颜料:6-9%,防开裂颜料:5-8%,消泡剂:0.5-0.9%,防沉剂:0.5-2%,滑石粉:7-9%,以上各组分之和为100%;
步骤2:将截止阀的阀体和阀杆所有表面清洁后加热,加热至温度为550-600℃,依次送入热喷涂设备中,将配制好的金属粉末通过喷枪均匀的喷撒在阀体的内表面和阀杆的外表面,其喷涂的厚度为0.05-0.08mm,然后进入加热炉迅速加热到730-780℃,保温1-1.5min;
步骤3:将加热完成的阀体和阀杆依次送入淬火器中,直接用高压喷射水进行淬火处理,使阀体和阀杆温度冷却到20-30℃;
步骤4:分别对冷却后的阀体的内表面和阀杆的外表面进行高压无气喷涂防腐涂料,防腐涂料分多次喷涂,当前一次喷涂的防腐涂料静置干燥后再进行后一次喷涂,其喷涂的最终厚度为0.05-0.07mm;
步骤5:组装截止阀,组装前,在阀体上的与阀杆连接处的内壁上由上至下固定有多个用于防止液体外漏的密封圈,组装时,将阀杆穿过密封圈并进行组装;
步骤6:对组装后的阀体的外表面涂抹防腐涂料,其厚度为0.02-0.05mm,先对其进行烘干处理2h,再静置干燥1h;
步骤7:将阀体外表面的防腐涂料层进行抛光,在平滑的阀体外表面上无缝隙的包裹一层聚丙烯纤维防腐胶带;
步骤8:对阀门进行高于工作强度1.5倍的强度试验以及质量检验,检验合格后,入库保存。
本发明进一步限定的技术方案是:前述步骤3中的对阀杆和阀体的淬火处理的具体方法分别为:对阀杆的淬火方法为:高压喷射水环绕在阀杆2个等份纵向方向喷出,压力大于等于6.5Mpa;对阀体的淬火方法为:高压喷射水在阀体腔内360°喷出,压力大于等于6.5Mpa。
本发明的有益效果是:
本发明组装截止阀的过程中,在阀体上的与阀杆连接处的内壁上由上至下固定有多个用于防止液体外漏的密封圈,有效地防止了液体外漏。
本发明在阀体的内表面和阀杆的外表面先喷涂合金粉末,再喷涂防腐涂料,进行双重保护,可以很好的保证阀体的安全性,使其免受酸性化学品的腐蚀,保证阀体的正常工作。
对于本发明中对阀体的内表面和阀杆的外表面进行高压无气喷涂方式,这种方式将涂料用高压喷射雾化成细小的微粒,使其均匀地分布于工件表面,可以形成光滑、致密的涂层,并且高压无气喷涂方式采用高压喷射雾化,使涂料微粒获得强有力的动能,涂料微粒借此动能射达工件空隙之中,因而使涂层更密,与工件的机械咬合力增强,附着力提高,有效延长涂层寿命,由于喷涂的精密方式,还可以节省涂料,减少浪费。
本发明在阀体外部无缝隙的包裹一层聚丙烯纤维防腐胶带,聚丙烯纤维防腐胶带是一种新型的无污染、无危害的环保型防腐材料, 不但在截止阀应用于地下测量管路时可以起到防腐防潮的作用,而且更加的环保,并且可以延长截止阀的使用寿命。
具体实施方式
实施例1
本实施例提供一种测量用管路截止阀的防腐密封工艺,包括如下步骤:
步骤1:配制金属粉末及防腐涂料;金属粉末的重量百分比组分为:Ni:50%、Cr:30%、Si:2.5%、S:0.3%、C:0.8%、Fe :7.1%,Mn:9%,V:0.3%;防腐涂料的重量百分比组分为:热固性丙烯酸树脂:43%,缩二脲多异氰酸酯:27%,耐磨颜料:8%,磷酸锌防锈颜料:7%,防开裂颜料:6%,消泡剂:0.8%,防沉剂:1%,滑石粉:7.2%;
步骤2:将截止阀的阀体和阀杆所有表面清洁后加热,加热至温度为600℃,依次送入热喷涂设备中,将配制好的金属粉末通过喷枪均匀的喷撒在阀体的内表面和阀杆的外表面,其喷涂的厚度为0.08mm,然后进入加热炉迅速加热到730℃,保温1.5min;
步骤3:将加热完成的阀体和阀杆依次送入淬火器中,直接用高压喷射水进行淬火处理,使阀体和阀杆温度冷却到25℃;对阀杆的淬火方法为:高压喷射水环绕在阀杆2个等份纵向方向喷出,压力等于6.5Mpa;对阀体的淬火方法为:高压喷射水在阀体腔内360°喷出,压力等于6.5Mpa;
步骤4:分别对冷却后的阀体的内表面和阀杆的外表面进行高压无气喷涂防腐涂料,防腐涂料分多次喷涂,当前一次喷涂的防腐涂料静置干燥后再进行后一次喷涂,其喷涂的最终厚度为0.07mm;
步骤5:组装截止阀,组装前,在阀体上的与阀杆连接处的内壁上由上至下固定有多个用于防止液体外漏的密封圈,组装时,将阀杆穿过密封圈并进行组装;
步骤6:对组装后的阀体的外表面涂抹防腐涂料,其厚度为0.05mm,先对其进行烘干处理2h,再静置干燥1h;
步骤7:将阀体外表面的防腐涂料层进行抛光,在平滑的阀体外表面上无缝隙的包裹一层聚丙烯纤维防腐胶带;
步骤8:对阀门进行高于工作强度1.5倍的强度试验以及质量检验,检验合格后,入库保存。
除上述实施例外,本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。
Claims (1)
1.一种测量用管路截止阀的防腐密封工艺,其特征在于:包括如下步骤:
步骤1:配制金属粉末及防腐涂料;所述金属粉末的重量百分比组分为:Ni:50%、Cr:30%、Si:2.5%、S:0.3%、C:0.8%、Fe :7.1%,Mn:9%,V:0.3%;所述防腐涂料的重量百分比组分为:热固性丙烯酸树脂:40-45%,缩二脲多异氰酸酯:25-30%,耐磨颜料:8-10%,磷酸锌防锈颜料:6-9%,防开裂颜料:5-8%,消泡剂:0.5-0.9%,防沉剂:0.5-2%,滑石粉:7-9%,以上各组分之和为100%;
步骤2:将所述截止阀的阀体和阀杆所有表面清洁后加热,加热至温度为550-600℃,依次送入热喷涂设备中,将配制好的金属粉末通过喷枪均匀的喷撒在所述阀体的内表面和所述阀杆的外表面,其喷涂的厚度为0.05-0.08mm,然后进入加热炉迅速加热到730-780℃,保温1-1.5min;
步骤3:将加热完成的阀体和阀杆依次送入淬火器中,直接用高压喷射水进行淬火处理,使阀体和阀杆温度冷却到20-30℃;
步骤4:分别对冷却后的阀体的内表面和阀杆的外表面进行高压无气喷涂防腐涂料,所述防腐涂料分多次喷涂,当前一次喷涂的防腐涂料静置干燥后再进行后一次喷涂,其喷涂的最终厚度为0.05-0.07mm;
步骤5:组装截止阀,组装前,在所述阀体上的与阀杆连接处的内壁上由上至下固定有多个用于防止液体外漏的密封圈,组装时,将所述阀杆穿过密封圈并进行组装;
步骤6:对组装后的阀体的外表面涂抹防腐涂料,其厚度为0.02-0.05mm,先对其进行烘干处理2h,再静置干燥1h;
步骤7:将所述阀体外表面的防腐涂料层进行抛光,在平滑的阀体外表面上无缝隙的包裹一层聚丙烯纤维防腐胶带;
步骤8:对阀门进行高于工作强度1.5倍的强度试验以及质量检验,检验合格后,入库保存。
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