三通球阀 Three-way Ball Valve

三通球阀有T型和L型。T型能使三条正交的管道相互联通和切断第三条通道，起分流、合流作用。L三通球阀型只能连接相互正交的两条管道，不能同时保持第三条管道的相互连通，只起分配作用。

Three-way Ball Valve

The three-way ball valve consists of T-type and L-type. T-type could connect three orthogonal pipes and cut off the third, so the function of split-flow and confluence could be realized. L-type could only connect two orthogonal pipes, but could not connect the third at the same time, so it plays a distributional role.