成全二人世界免费观看_激情都市亚洲一区二区_五个黑人玩一个女5p的小说_美女的裸体(无遮挡)的照片_国产古装妇女野外a片_九尾漫画免费漫画入口页面弹窗_老司机午夜精品99久久免费_亚洲成人国产_无码熟妇人妻av在线影片最多

Check valve refers to the valve that automatically opens and closes the valve flap by relying on the flow of the medium itself to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. The check valve is an automatic valve whose main function is to prevent the backflow of the medium, the reverse rotation of the pump and the driving motor, and the discharge of the container medium.

Check valve pressure test method:

Check valve test state: the axis of the lift check valve disc is in a position perpendicular to the horizontal; the axis of the swing check valve channel and the disc axis are in a position approximately parallel to the horizontal line.

During the strength test, the test medium is introduced from the inlet to the specified value, and the other end is closed, and it is qualified to see that the valve body and valve cover have no leakage.

In the sealing test, the test medium is introduced from the outlet end, and the sealing surface is checked at the inlet end, and no leakage at the packing and gasket is qualified.