When the closedchannel, the wedge-shaped head with a stem to open up the ball and pressed to seal the valve seat.
当关闭通道时，用阀杆的楔形头使球体涨开与阀座压紧达到密封。
2
Mud valves and Angle by the hydraulic cylinder type combination valve, hydraulic power drive cylinder valve lift, the valve open or closedchannel, in order to achieve the fluid off.
排泥阀产品由液压缸和角式截止阀组合而成，液压缸内动力带动瓣升降，使阀体通道开或闭，以达到流体通断。
3
With any social network, adding a contact doesn't necessarily open an otherwise closed communications channel with that person; it merely invites such openings.