PARKER電磁閥在滿足過程控制要求的前提下，所選的閥應盡量簡單、可靠、價廉、壽命長、維修方便和備件來源及時可靠。要盡力避免單純追求好的結構、好的材質、多帶附件，而忽略了對可靠性、經濟性的考慮。從可靠性觀點來看，結構越簡單，其可靠性就越高；材質選擇過高，將造成不必要的價格投入。
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