Copper-based alloy valves have the advantages of high mechanical strength, wear resistance, good safety (no static electricity generation), so the real reason is that the iron filings generated by the sealing surface of the gate valve are extremely culprit, as for the sealing. Declining or not is not the key.
In fact, many oxygen pipelines that do not use gate valves have the same explosion accidents. Generally, the pressure difference between the two sides of the valve is large, and the valve opens faster. Many accidents also indicate that the ignition source and combustible materials are the ultimate cause. Disabling the gate valve is just a means of controlling combustibles, and the purpose of regularly removing rust, degreasing, and oil-free means is the same. As for controlling the flow rate and making electrostatic grounding, it is the source of ignition. Personally think that the valve material is the first factor, and similar problems appear on the hydrogen pipeline. The new specification has removed the word "disabled gate valve". This is a testimony. The key is to find the cause. Many companies do not care about the operating pressure at all. Forced use of copper-based alloy valves, but the same explosion accidents, so control of fire and combustibles, careful maintenance, tight and secure this string is the most critical.