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原文:
Plastic diaphragm valve is suitable for the corrosive medium of transport and the regulation of river closure, flow, according to the material use different temperature - 14 ℃ ~ 100 ℃, 140 ℃ and 40 ℃ ~, the flow components of RPP or PVDF plastic assembled, excellent corrosion resistance, easy to operate, light body, can take the place of stainless steel valves, seal diaphragm manufactured F46 or PFA, folding number 1200 or higher, corrosion resistance and F4. 1. Suitable for corrosive medium of transport and the regulation of river closure, flow, according to the material use different temperature - 14 ℃ ~ 100 ℃ and 40 ℃ ~ 140 ℃. 2. The flow components of RPP or PVDF plastic assembled, excellent corrosion resistance, easy to operate, light body, can take the place of stainless steel valves. 3. The seal diaphragm manufactured F46 or PFA, folding number 1200 or higher, corrosion resistance and F4. 4. Use the screw lift structure, opening and closing torque, good stability.塑料隔膜阀的原理。
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以下是参考译文:

译文:
塑料隔膜阀适用于腐蚀介质的输送及截流、流量的调节,根据材质不同使用温度-14℃~100℃、-40℃~140℃,.过流部件彩RPP或PVDF注塑件组装而成,耐腐蚀性能优良,操作方便,体量轻,能代替不锈钢阀门,密封件膜片采用F46或PFA制造,耐折次数≥1200次,耐腐蚀性能与F4相当。1.适用于腐蚀介质的输送及截流、流量的调节,根据材质不同使用温度-14℃~100℃、-40℃~140℃。2.过流部件彩RPP或PVDF注塑件组装而成,耐腐蚀性能优良,操作方便,体量轻,能代替不锈钢阀门。3.密封件膜片采用F46或PFA制造,耐折次数≥1200次,耐腐蚀性能与F4相当。4.采用螺杆升降结构,启闭力矩大,平稳性好。塑料隔膜阀的原理。