... :oilfield equipment 3.WP:High pressure Well head assembly(hammer union) High-pressure union, importing international advanced technology, is forged with high- ... , butt-weld and compress-seal. The type mainly consists of: 100#, 200#, 206#, 207#,211#, 400#, 600#, 602#, 1002#, 1003#, ... gate valve, mud gate valve, chock valve, etc)3) Fitting(union, manifold,elbows), bop. Well head assembly(hammer union)