原文：
       调节阀不像手动阀门那样，安装好了以后就很少再去管理、维护，它必须勤加维护才能保证正常的运行和较长的使用寿命。下面我们提出八种延长调节阀使用寿命的方法。

    1） 大开度工作让调节阀一开始就尽量在最大开度上工作，如80％。这样，汽蚀、冲蚀等破坏发生在阀芯头部上。随着阀芯破坏，流量增加，相应阀再关一点，这样不断破坏，逐步关闭，使整个阀芯全部充分利用，直到阀芯根部及密封面破坏，不能使用为止。同时，水力控制阀大开度工作节流间隙大，冲蚀减弱，这比一开始就让阀在中间开度和小开度上工作提高寿命1～5倍以上。如某化工厂采用此法，阀的使用寿命提高了2倍。

    2）减小S增大工作开度 减小S，即增大系统除调节阀外的损失，使分配到阀上的压降降低，为保证流量通过调节阀，必然增大调节阀开度，同时，阀上压降减小，使气蚀、冲蚀也减弱。具体办法有：阀后设孔板节流，消耗压降；关闭管路上串联的手动阀，截止阀至调节阀获得较理想的工作开度为止。对一开始阀选大处于小开度工作时，采用此法十分简单、方便、有效。

    3）缩小口径增大工作开度 通过把阀的口径减小来增大工作开度，具体办法有：①换一台小一档口径的阀，如DN32换成DN25；②阀体不变更，更换小阀座直径的阀芯阀座。如某化工厂大修时将节流件dgl0更换为dg8，寿命提高了1倍。

    4）转移破坏位置 把破坏严重的地方转移到次要位置，电磁阀以保护阀芯阀座的密封面和节流面。

   5）增长节流通道 增长节流通道最简单的就是加厚阀座，使阀座孔增长，形成更长的节流通道。一方面可使流闭型节流后的突然扩大延后，起转移破坏位置，使之远离密封面的作用；另一方面，又增加了节流阻力，减小了压力的恢复程度，使汽蚀减弱。有的把阀座孔内设计成台阶式、波浪式，就是为了增加阻力，削弱汽蚀。止回阀这种方法在引进装置中的高压阀上和将老的阀加以改进时经常使用，也十分有效。

   6）改变流向 流开型向着开方向流，汽蚀、冲蚀主要作用在密封面上，使阀芯根部和阀芯阀座密封面很快遭受破坏；流闭型向着闭方向流，汽蚀、冲蚀作用在节流之后，阀座密封面以下，保护了密封面和阀芯根部，延长了寿命。故作流开型使用的阀，安全阀当延长寿命的问题较为突出时，只需改变流向即可延长寿命1～2倍。

    7）改用特殊材料 为抗汽蚀（破坏形状如蜂窝状小点）和冲刷（流线型的小沟），可改用耐汽蚀和冲刷的特殊材料来制造节流件。这种特殊材料有6YC－1、A4钢、司太莱、硬质合金等。为抗腐蚀，可改用更耐腐蚀，并有一定机械性能、物理性能的材料。这种材料分为非金属材料（如橡胶、四氟、陶瓷等）和金属材料（如蒙乃尔、哈氏合金 等）两类。

    8）改变阀结构 采取改变阀结构或选用具有更长寿命的阀的办法来达到提高寿命的目的，如选用多级降压式阀，反汽蚀阀、耐腐蚀阀等。

“ Improve the method of valve life ”是由中国调节阀网提供的国际阀门新闻，译文仅供参考。另外，中国调节阀网还提供相关产品搜索： 手动调节阀、 核用调节阀、 智能调节阀、 自动调节阀、 调节阀价格等。

译文：
       Unlike the manual valve control valve, as installed a few go beyond the management, maintenance, it must spare no effort to ensure the maintenance of normal operation and longer life. Here we present eight ways to extend valve life. 1) the work of a large opening So that the start valve opening on the maximum possible, such as 80%. Thus, cavitation, erosion and other destruction occurred in the valve head on. With the valve damage, flow increases, the corresponding valve a little further off, so continue to disrupt the gradual closure of the entire spool fully used until the spool and the sealing surface root damage, can not be used up. Meanwhile, the work of cutting a large opening gaps large, erosion weakened the outset than valve opening in the middle and the small opening to work to improve life of 1 to 5 times. If a chemical plant using this method, valve service life by 2 times. 2) reduce the increase of job openings S Reduced S, which increases the Filtersystem except the loss of outside control valve, so that distribution into the valve on the pressure drop, in order to ensure flow through the valve, will inevitably increase the valve opening while the valve on the pressure drop was reduced to cavitation, erosion is also reduced. Specific measures include: the valve orifice throttle setting, consumption pressure drop; closed manual valve series pipeline, to get better control valve job opening up. Large selection of a start at small valve opening work, the use of this method is simple, convenient and effective. 3) reduce the diameter increases theForged Steel Valves work of opening Reduced through the valve to increase the caliber of the work of opening the specific measures are: ① replace a small-caliber valve of a file, such as DN32 replaced by DN25; ② body does not change, the replacement of small diameter of the spool valve seat Block. If a chemical plant overhaul will be replaced by cutting pieces of dgl0 dg8, life expectancy increased by 1 times. 4) The transfer of the failure location Severely damaged areas to transfer to a secondary location to protect the valve seat sealing surface and the cutting surface. 5) increased throttle channel Growth in the most simple throttle channel is thicker seat, so that the valve seat hole growth, the formation of a longer throttle channel. On the one hand enable the Liu-type after throttleBellow Seal Valves is suddenly closed expansion delayed transfer of damage from the location, away from the sealing surface of the effect; on the other hand, increased throttle resistance, reduce the degree of pressure recovery, so that cavitation decreased. Some of the holes designed stepped seat, wave type, is to increase the resistance, reduced cavitation. This method of introducing high-pressure valve on the device and will be improvedNeedle Valves the old valve often used, is also very effective. 6) changes in flow Open toward the opening direction of flow type flow, cavitation, erosion a major role in the sealing surface, so that spool valve seat sealing surface roots and quickly destroyed; flow towards the closed direction closed-type flow, cavitation, erosion effect In the throttle, the valve seat sealing surface below, to protect the valve sealing surface and the root of the prolongation of life. Pretending to be away and use the valve type, while extending the life issue is more prominent,Automatic Control Valvesjust change the flow of life can be extended 1 to 2 times. 7) The use of special materials For the anti-cavitation (damage, such as honeycomb shape of small dots) and erosion (streamlined the minor groove), would be able to cavitation and erosion-resistant special materials to create cutting pieces. This special material is 6YC-1, A4 Steel, Division too Lai, carbide, etc.. For the anti-corrosion, can switch to a more corrosion-resistant, and have certain mechanical properties, physical properties of materials. This material is divided into non-metallic materials (such as rubber, PTFE, ceramics, etc.) and metal materials (such as Monel, Hastelloy, etc.) categories. 8,) to change the valve structure To change the valve structure or use a longer valve life means to achieve the purpose of improving life expectancy, such as the use multi-stage step-down valves, anti-cavitation valve, corrosion resistant valves.

原文来源：http://www.1tiaojiefa.com/

2010-07-26 07:26

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