When the pressure go to the pipe, valve control will rise ,the valve routeway will open .There is no perch , sealed cushion and orientation seat in the valve .

• 阀门没有阀杆、密封垫、定向座等，通道中运动的唯一部件就是隔膜，所以不存在锈蚀及抱死现象，具有更高的稳定性。