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二通插装阀是插装阀基本组件(阀芯、阀套、弹簧和密封圈)插到特别设计加工的阀体内，配以盖板、先导阀组成的一-种多功能的复合阀。因每个插装阀基本组件有且只有两个油口，故被称为二通插装阀，早期又称为逻辑阀。

在非专业化条件下批量制作电子产品的时候，通常是手工安装元器件与焊接操作同步进行。应该先装配需要机械固定元器件，先焊接那些比较耐热的元器件，如接插件、小型变压器、电阻、电容等；然后再装配焊接比较怕热的元器件，如各种半导体器件及塑料封装的元件。