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二通插裝閥是插裝閥基本組件(閥芯、閥套、彈簧和密封圈)插到特別設計加工的閥體內，配以蓋板、先導閥組成的一-種多功能的復合閥。因每個插裝閥基本組件有且只有兩個油口，故被稱為二通插裝閥，早期又稱為邏輯閥。

在非專業化條件下批量制作電子產品的時候，通常是手工安裝元器件與焊接操作同步進行。應該先裝配需要機械固定元器件，先焊接那些比較耐熱的元器件，如接插件、小型變壓器、電阻、電容等；然后再裝配焊接比較怕熱的元器件，如各種半導體器件及塑料封裝的元件。