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防腐氟塑阀门应用的注意要点

文字:[大][中][小] 手机页面二维码 2015/11/18     浏览次数:    

衬塑阀门价格大大低于耐腐蚀不锈钢阀门和哈氏合金阀门,有的强腐蚀介质金属阀都不能用,只有衬塑阀能用好。但衬塑阀门必须合适应用,希注意鸭嘴阀 应用压力和应用温度等几项使用技术条件,以我公司的产品为例说明如下: (1)初氟塑阀门使用的介质温度:我公司的各类衬氟塑阀门,采用的氟塑料是F46 (FEP),使用的介质温度不能超过150℃ (介质温度短时间可到150℃,油田阀

长时间的使用温度应在120℃左右),否则,阀门的各部件衬的F46易软化、变形,致使阀门关不死、泄漏量大。 如遇到用户使用的介质温度,短时间温度在180℃以下,长时间温度在150℃以下,可选用另一种氟塑料一PFA,但衬PFA氟塑料的价格较贵,在配套时应事先询价。 (2)不要有负压。衬氟塑阀门应避免使用的管道内有负压,闸门 如有负压,易造成阀门内腔的衬氟塑层被吸出(鼓出)、脱壳,导致阀门开启、关闭发生故障。 (3)压力、压差应控制在允许范围内。尤其电站阀门是波纹管密封的衬氟塑调节阀、截止阀。因波纹管是四氟材料制作的,压力高、压差高,容易导致波纹管破裂。 波纹管密封的衬氟塑调节阀,使用条件压力、压差高的,可改为四氟填料密封。 (4)衬氟塑阀门使用的介质条件不宜有硬质颗粒、结晶、杂质等,以免阀门在开启、关闭的运行中磨破阀芯、阀座的衬氟塑层或四氟波纹管。对介质有硬质颗粒、结晶、杂质的,选用时,阀芯、阀座可改用哈氏合金,冶金阀门但需另行询价。 (5)衬氟塑调节阀应按需要的流量(CV值)正确选用阀门的通径大小。在选用时,应根据需要的流量(CV值)等技术参数计算阀门的开启度和选用阀门的通径。如阀门的通径选得太大了,势必使阀门长期在开启度较小的情况下运行,加上介质的压力,这样容易使阀门受到介质的冲击而产生振动,阀芯杆长期在介质的冲击、振动下,甚至会使阀杆断裂。 用户在配套(选用)各类衬氟塑阀门时,尽可能的了解、掌握使用技术条件,以便选好、用好,提高阀门的使用寿命。

“ Anticorrosion Fluorine Plastic valve application note points ”是由中国闸阀网提供的阀门行业新闻,译文仅供参考。另外,中国闸阀网还提供相关产品搜索: 电动闸阀、 手动闸阀、 气动闸阀、 楔式闸阀、 刀形闸阀(刀闸阀)等。

译文:

Lining the valve is significantly less than stainless steel valves and corrosion resistant Hastelloy valves, and some strong corrosive metal valve does not work, only lined valve can be used well. But lining the valve must be suitable applications, application of pressure and application of the Greek note several temperature conditions for the use of technology to our products as an example as follows: (1) the early use of the medium temperature fluoroplastic valve: Our range of fluorine plastic valves, plastic is used fluorine F46 (FEP), using the medium temperature should not exceed 150 ℃ (short to medium temperature to 150 ℃, long time temperature should be about Forged Gate, Globe, Check Valves120 ℃), otherwise, the various parts of the valve easy to soften the lining of the F46, deformation, resulting in valve related death, and leakage volume. In case of user-medium temperature, short time temperature below 180 ℃, long time temperature below 150 ℃, can Ball Valveschoose another one fluoroplastic PFA, PFA lined fluorine plastic but more expensive, should be in supporting pre- inquiry. (2) not to have negative pressure. Fluorine plastic pipe valve should avoid the use of negative pressure inside, where negative pressure, easily lead to valve cavity of fluorine plastic layer being sucked out of (a conspicuous), shell, causing the valve to open and close failure. (3) pressure, pressure should be Cast Gate, Globe, Check Valvescontrolled within the allowable range. In particular, fluorine plastic bellows sealed valves, globe valves. PTFE material for corrugated pipe is made, the pressure is high, pressure high, easily lead to broken bellows. Fluorine plastic bellows sealed valves, use pressure, high pressure, could be replaced by PTFE gasket seal. (4) fluorine plastic valves should Resilient Seated Gate Valvesnot have to use the media conditions of hard particles, crystal, impurity, so that the valve in the open, close the running frayed spool, the valve seat of fluorine plastic layer or PTFE bellows . On the medium with hard particles, crystals, impurities, and selection, the valve, the valve seat can be switched Hastelloy, subject to further inquiry. (5) fluorine plastic flow control valve should be required (CV) the correct selection of the size of the valve diameter. The choice should be according to need Flow (CV) and other technical parameters of the valve opening degree calculation and selection of valve diameter. If the valve diameter too big election is bound to make a long valveAutomatic Control Valves opening degree is relatively small operation, with medium pressure valve by the media so easily to the impact and vibration, spools Rod In the medium shock, vibration, the stem will break even. Users in the package (optional) types of fluorine plastic valve, as much as possible knowledge about the use of technical conditions in order to choose the right, with a good increase valve life.

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