Closed loop connector for dispensing systems

A closed loop dispensing system comprises a connector connectable to a container for selectively dispensing the fluids from the container. The connector includes an outer cap having a first passage with an interior surface. The first passage can have variable cross-sectional areas over different regions of the first passage. The connector comprises a plug slidingly movable between an open position and a closed position, wherein, the plug allows passage of fluids present in the container in the open position, and the plug prevents passage of fluids out of the container in the closed position. The plug can have a variable cross-sectional area thereby preventing the plug from being disengaged with the outer cap or sliding out of the connector and into the container. 本公开涉及种闭环分配系统，其包括连接器，所述连接器可连接到容器以用于从所述容器选择性分配流体。所述连接器包含外部帽，所述外部帽具有带有内表面的第通路。所述第通路可在所述第通路的不同区上具有可变横截面积。所述连接器包括可在打开位置与关闭位置之间滑动地移动的插头，其中所述插头在所述打开位置中允许存在于所述容器中的流体的通过，且所述插头在所述关闭位置中防止流体退出所述容器的通过。所述插头可具有可变横截面积，从而防止所述插头与所述外部帽脱离或者滑出所述连接器且进入所述容器。