MOOG伺服閥太精細，對液壓油的污染很敏感，主閥芯尺寸小，不適合高壓大流量的系統(tǒng)，但控制比較，而且可以做多余度控制。MOOG比例閥相對簡單一些，先導閥可以產生2升/分鐘的高壓油，主閥芯的流量zui大可以達到500升以上，但液壓慣性大，不適合高頻，輸出流量也沒那么。

美國MOOG穆格D660系列伺服閥先導級采用了伺服射流管,降低了能耗,提高了閥的堅固性。由于伺服射流管先導級具有很高的無阻尼自然頻率（500HZ）,因此此種閥的動態(tài)響應較高,并被廣泛應用于塑料機械,壓鑄機,重工業(yè)等,并在實踐中體現出Z越的性能。

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