GOST 12820-80 PN6-PN40
is neck flat welding flange with pressure PN6-PN40, and we produce ANSI, JIS, EN, DIN flanges. We grant our buyers with our strict quality control system and good serivce. In addition, we also do the United States, Japan, Britain, Germany, the series of products. won a lot of customer recognition, over the same period the company won three national patents.