Raphael was founded in 1949, and was one of first manufacture of high quality valve, it takes the lead in valve industry in the fields of conventionalvalve and renovation.
As described earlier, the electrical current to the solenoid of a proportional valve needs to be regulated and not just simply switched on or off as is the case with a conventionalvalve.
作为简单描述，提供给比例阀电磁铁的电流需要被调节，不象应用常规阀的时仅有开关通或断那样简单。
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Valve and strainers must be supported with conventional piping system support devices.