Quick-release valve for oxygen pipeline
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Code for Design of Industrial Metal Piping GB50316-2000, 5.5.9: Quick-open and quick-close valves shall not be used for oxygen pipelines. The gaskets and packing inside the valve should not be made of materials that easily shed debris or fibers, nor of combustible materials. Explanation of the provision: 5.5.9 Valves whose handles can be rotated 90° to open or close them, or valves whose opening and closing speed is equivalent to or faster than that, are considered fast-opening and fast-closing valves. In fact, there are many ball valves found in oxygen pipelines. I would like to ask: don’t one-piece, two-piece, and three-piece ball valves also fall under the category of quick-opening valves? Also, nowadays oxygen is equipped with shut-off valves. What to do.
The ball valves you mentioned are generally quick-open and quick-close types that are operated by rotating a handle by 90° to open or close them; therefore, they do not meet the requirements specified in clause 5.5.9 of the industrial metal piping design standard GB50316-2000 for valves used in oxygen pipelines. However, in practice, some ball valves are still widely used to facilitate the operation and control of oxygen supply. To prevent safety accidents, special attention must be paid to the material selection and design of these ball valves. To ensure the safe use of oxygen pipelines, valves specifically designed for oxygen pipelines should be selected when choosing ball valves, and they must be installed and maintained in strict accordance with the installation instructions. At the same time, a shut-off valve should be installed on the pipeline to stop the oxygen supply promptly in case of problems. .
This also depends on factors such as pipe diameter, fluid velocity, and pressure; for reference only. It is recommended to refine your question; you shouldn’t be general and try to cover everything at once.
This standard may be outdated. The oxygen stations and converter top-blowing systems that we design and install are all equipped with quick shut-off valves. Quick shutdown does not refer to ball valves that switch at 90°; valves with a structure similar to globe valves can also be used for quick shutdown. But nowadays, ball valves are often chosen as quick shut-off valves due to their low cost, stability in operation, and the fact that the PTFE sealing element does not easily break apart or produce debris.
Clause 5.4.1 of JBT 12955-2016 \"Technical Requirements for Valves Used for Oxygen\" stipulates that \"ball valves should be of gear-driven type.\" Therefore, quick-opening valves cannot be used for oxygen pipelines.
From a design perspective, non-conformities are dealt with in a one-size-fits-all manner. :lol
Many small-diameter applications actually use straight-ball valves. Turning the switch 90 degrees is, by definition, an instant-on valve
That’s correct; this rule also applies to medical oxygen. Fast-opening valves still must not be used. . . Difficult, difficult
Well, in terms of actual use, there’s definitely no problem, but many owners and experts focus on the regulations; if something doesn’t comply with those regulations, they dare not speak out.
It should also be noted that regarding a valve, there is a distinction between one that is suitable for quick shutdown operations, another that is designed for such actions, and then there are the valve actuators used for quick shutdown. There are also valves suitable for quick shutdown, even if their actuators are not of the quick shutdown type. For reference.