我们杭州阀门厂生产的高压阀门和高压管件及紧固件,大部分使用于年产3000吨或5000吨的小化肥设备上,而这种小化肥所用的高压阀门和高压管件,有相当一部分安装在露天位置上。过去,这些阀门和管件装上后不久。外表面就开始生锈,时间长了往往由于严重的锈蚀,特别在螺纹联接处的生锈而失去了修复使用的价值。另外,阀杆的磨损和腐蚀历来是影响阀门寿命的主要因素之一,因此,我厂于66年开始,对高中压阀门的一些外露加工面的零 Most of the high-pressure valves and high-pressure pipe fittings and fasteners produced by our valve factory in Hangzhou are used on small fertilizer plants with an annual output of 3,000 tons or 5,000 tons, and a large number of high-pressure valves and high-pressure pipe fittings used for such small fertilizers have a considerable portion installed In the open air. In the past, these valves and fittings were installed soon after. The outer surface begins to rust, which for a long time often loses its value for repair due to severe rusting, particularly rusting at the threaded connections. In addition, the stem wear and corrosion has always been one of the major factors affecting the valve life, therefore, I plant in 66 years, some of the high pressure valve surface exposed zero