供應SP-149857;
SP-149857。
電磁閥選型首先應該依次遵循安全性，可靠性，適用性，經濟性四大原則，其次是根據六個方面的現場工況(即管道參數、流體參數、壓力參數、電氣參數、動作方式、特殊要求進行選擇)。
選型依據：
1、根據管道參數選擇電磁閥的：通徑規格(即DN)、接口方式
1)按照現場管道內徑尺寸或流量要求來確定通徑(DN)尺寸;
2)接口方式，一般>DN50要選擇法蘭接口，≤DN50則可根據用戶需要自由選擇。
2、根據流體參數選擇電磁閥的：材質、溫度組
1)腐蝕性流體：宜選用耐腐蝕電磁閥和全不銹鋼;食用超凈流體：宜選用食品級不銹鋼材質電磁閥;
2)高溫流體：要選擇采用耐高溫的電工材料和密封材料制造的電磁閥，而且要選擇活塞式結構類型的;
3)流體狀態：大至有氣態，液態或混合狀態，特別是口徑大于DN25時一定要區分開來;
4)流體粘度：通常在50cSt以下可任意選擇，若超過此值，則要選用高粘度電磁閥。
3、根據壓力參數選擇電磁閥的：原理和結構品種
1)公稱壓力：這個參數與其它通用閥門的含義是一樣的，是根據管道公稱壓力來定;
2)工作壓力：如果工作壓力低則必須選用直動或分步直動式原理;工作壓差在0.04Mpa以上時直動式、分步直動式、先導式均可選用。
4、電氣選擇：電壓規格應盡量優先選用AC220V、DC24較為方便。
5、根據持續工作時間長短來選擇：常閉、常開、或可持續通電
1)當電磁閥需要長時間開啟，并且持續的時間多于關閉的時間應選用常開型;
2)要是開啟的時間短或開和關的時間不多時，則選常閉型;
3)但是有些用于安全保護的工況，如爐、窯火焰監測，則不能選常開的，應選可長期通電型。
6、根據環境要求選擇輔助功能：防爆、止回、手動、防水霧、水淋、潛水。
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