Brief introduction of large diameter flat welding flange with neck As the name implies, the large-diameter flat-welded neck flange is a flat-welded neck flange used on pipes with relatively large diameters; Large-diameter flat-welded neck flanges are mainly processed by CNC lathes, semi-automatic lathes, and drilling machines; Large diameter neck flat welding flangeSpecifications DN15-DN1000 Pressure Level […]