Welding slag, rust, slag, etc. in the pipeline can cause blockage or jamming in the throttle port, guide part, and balance hole of the lower valve cover, resulting in scratches and abrasions on the valve core surface and guide surface,

The high-pressure flange sealing surface of the high-pressure hydrogenation unit usually adopts RJ surface, and the gasket used is a metal ring gasket,

The overall plan for the reform of the petroleum and natural gas system, led by the National Development and Reform Commission and the Energy Administration, has been drafted and is currently being improved. It is expected to be unveiled by the end of the year. The new round of overall oil and gas reform involves market access and price liberalization in various fields of oil and gas upstream, midstream, and downstream, with the core being upstream liberalization and pipeline separation.