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1 Desalted water medium containing low concentration of acid or alkali, they have larger corrosion in rubber. Rubber corrosion performance for expansion, aging, low intensity, in line with rubber butterfly valve, diaphragm valve use effect is the essence of which is the rubber is not caused by corrosion. After the rubber diaphragm valve to improve the corrosion resistance of good fluorine-butterfly diaphragm valve, but fluorine-butterfly diaphragm valve diaphragm and yield to fold up and down and were broken broken, mechanical damage, the shorter the life of the valve. Now is the best way to deal with water special ball valve, it can be used to 5 ~ 8 years. Diaphragm valve replacement function for gas closed when the valve is installed must be noticed when diaphragm: 1) cut off the actuator gas source, make diaphragm, from the sealing surface. 2) cross remove the four screws on the valve body and separate the actuator and valve seat, ventilation, replace the diaphragm. 3) in the diaphragm of the diaphragm and seat up state good seal face, cross mounting screws. 5) ventilation activity a few times repeatedly, shut down after the diaphragm valve leakage test, can be normal use.隔膜阀的机械性破坏。
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以下是参考译文:

 

译文:
脱盐水介质中含有低浓度的酸或碱,它们对橡胶有较大的腐蚀性。橡胶的被腐蚀表现为膨胀、老化、强度低,用衬胶的蝶阀、隔膜阀使用效果 都差其实质就是橡胶不耐腐蚀所致。后衬胶隔膜阀改进为耐腐蚀性能好的衬氟隔膜阀,但衬氟隔膜阀的膜片又经不住上下折叠而被折破,造成 机械性破坏,阀的寿命变短。现在最好的办法是用水处理专用球阀,它可以使用到5~8年。隔膜阀安装时对于气闭功能阀更换膜片时需注意: 1)切断执行机构气源,使膜片提起,脱离密封面。2)交叉拆卸阀体上的四颗螺钉,使执行机构与阀座分离,通气,更换膜片。3)在使膜片收 起状态下将膜片与阀座上的密封面对好,交叉安装固定螺钉。5)反复通气活动几次,关闭膜片阀试漏后,可正常使用。隔膜阀的机械性破坏 。