Ball valve uses ball with circular hole as open-close part ,through turning ball with stem to realize on-off movement.Ball valve is mainly applied to stop ,distrubute and change flowing direction of medium.

• 球阀是用带圆形的通孔的球体作启闭件，球体随阀杆转动，以实现启闭动作的阀门，球阀在管道中主要用于切断，分配和改变介质流动方向。