< ) High-pressure national standard flanges refer to flanges that exceed the dimensions specified by relevant national departments. Generally refers to flanges of the above sizes. Such products are all welded products and do not have thread fasteners. The specifications commonly used in thread fastener products are reached. High pressure national standard flange manufacturer National flange standard B/The largest size among the pressure standards is. It has reached the maximum pressure standard.
< r >
Welding flange