14 January 2026 Dongjun Machinery's high-pressure flat gate valve with post-sealing has been granted a national patent. ... View Details
14 January 2026 Dongjun Machinery's Marine Vertical Throttling and Killing Manifold Obtains National Patent ... View Details
14 January 2026 Dongjun Machinery's integrated electric pump wellhead device with safety valve has been granted a national patent. ... View Details
