Solenoid valves and diaphragm valves do not work well in the water flowing way, disassembling the constructive parts thoroughly revealed that the criminal of nervous inconveniences was nothing but some crystal deposit clogged in the valves. And just water flowing cannot flow the material away and the only way to remove is that by prying out mechanically with the best care.
Also various rubber sealing material, so to speak O-shape rubber ring NBR(Nitrile Butadiene Rubber) has tendency to be deformed with permanent distortion phenomena, inviting the increase of the rate of slipping resistance leading to no smooth movement of plunger in solenoid construction. So those of the prominent parts requires replacement of small rubber rings exactly following to Japan Industrial standard, JIS.
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