How to draw a breathing filter in PID?

This post was last edited by ylb913 on 2018-7-17 at 20:22. A breathing filter is simply a filter attached to the exhale valve; I’ve really never seen one before, and it’s the first time I’ve heard of it. I’ve seen many exhale valves equipped with a flame arrester as well, and they serve basically the same purpose. Anyway, since they are integrated devices, it’s not appropriate to represent them using two separate device schematics. Symbols like these were indeed part of the standards in certain industries in the past, but in recent years I’ve seen many design institute drawings whose first pages differ from the so-called standard legend. In short, the unity is not very strong. What about the rest? Firstly, provide a complete description of the homepage image (it’s inevitable that some details might be missed in such an image, and I think this shouldn’t happen); if it’s really difficult to express everything, text annotations can be added. It’s nothing special – construction drawings are there so that people can understand them, so that the purchasers know what to buy, so that the constructors know how to build, and so that the users know how to use it.

Then I can only draw a breathing valve and mark it specially

It is widely used in the pharmaceutical industry, for example on purified water storage tanks. . .

Is there such a way of drawing it? Let’s take a look