Use of specifications
During the use of this valve, the medium flows in the direction of the arrow shown.
When the medium flows in the specified direction, the disc is opened by the medium force; when the medium countercurrent, because the disc weight and the disc by the medium reverse force action, so that the disc and seat sealing surface close, to prevent the medium countercurrent purpose.
The sealing surface of valve body and disc is made of stainless steel surfacing.
The length of the valve shall be as specified in the gb12221-1989 and the dimensions of the flange connection shall be as specified in the jb/t79-1994.