Butt-welded flanges cannot be stored for a long time and should be inspected in a timely manner. The frequently exposed surfaces must be kept clean, dirt removed, and stored neatly in an indoor air-dry place. Do not stack or store them in the open. When flanged ball valves, globe valves and gate valves are used, they are only fully opened or fully closed, and flow adjustment is not allowed to avoid corrosion and accelerated wear on the sealing surfaces.
Butt welding flange sealing surface type has flat surface and convex surface, the flange structure is simple, small size, light weight, it is compact and reliable. At present, the sealing surface materials of ball valves are widely used in plastics and have good sealing performance.
It is also widely used in vacuum systems, with easy maintenance, simple ball valve structure, generally effective sealing rings, easy removal and replacement, and the ball's sealing surface and valve seat are isolated from the medium when fully opened or completely closed.