德國REXROTH力士樂先導式電磁閥：
原理：通電時，電磁力把先導孔打開，上腔室壓力迅速下降，在關 閉件周圍形成上低下高的壓差，流體壓力推動關閉件向上移動，閥門打開；斷電時，彈簧力把先導孔關閉，入口壓力通過旁通孔迅速腔室在關閥件周圍形成下低上高的壓差，流體壓力推動關閉件向下移動，關閉閥門。
特點：流體壓力范圍上限較高，可任意安裝（需定制）但必須滿足流體壓差條件。 力士樂電磁閥閥體全不銹鋼；對于強腐蝕的介質必須選用隔離膜片式。中性介質，也宜選用銅合金為閥殼材料的電磁閥，否則，閥殼中常有銹屑脫落，尤其是動作不頻繁的場合。氨用閥則不能采用銅材。
力士樂電磁閥爆炸性環境：必須選用相應防爆等級產品，露天安裝或粉塵多場合應選用防水，防塵品種。
REXROTH電磁閥公稱壓力應超過管內zui高工作壓力。 力士樂電磁閥4WRE系列是用電磁控制的工業設備，是用來控制流體的自動化基礎元件，屬于執行器，并不限于液壓、氣動。用在工業控制系統中調整介質的方向、流量、速度和其他的參數。力士樂電磁閥可以配合不同的電路來實現預期的控制，而控制的精度和靈活性都能夠保證。 上海維特銳供應德國REXROTH電磁閥 4WE10P3X/CG24N9K4/A12
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