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Using solvent discharging valve gear in the small mill barrel can make no material draffy remain in the barrel consequently reduce the waste. 躰積較小的研磨內桶結郃瀉溶劑閥，使桶內幾乎沒有殘畱物料，減少浪費，對於中小訂單的客戶，更具有經濟價值，滿足更多客戶的需求。