So what your saying is; "that it is widely known that a detonation flame arrester device including a left and right housing assembly contain two flapper plates", but if the flapper plates "positioned one in either side of the housing assembly" are actually "separated by a channeled barrier in the form of a stacked plate" then the "flame arrester" design you describe can't possibly "allow vapor passage under normal non-activated conditions." The flapper plates must be positioned at the proper "angle" to be forced shut in advance. A "detonation or deflagration wave" that could be "coming from either direction" is unlikely to propagate through the piping system due to wave interference. The flapper plate being "activated by the action of the pressure front" makes the whole assembly unstable and the fact that "each plate is of a size and shape to cover the entire cross sectional area of the housing assembly" creates enough back pressure to ensure a stuck valve.Therefore, "the flapper plates" can't "optionally be slammed shut by torsion springs" even if they are "activated through alternate activation devices". "Alternate activation devices" can not include: "fusible links which would release the torsion spring and shut the flapper plate upon exposure to excessive heat;" since the location of the valve and the "transfiguration of metastatic fuel consumption" produces only "low temperatures". I do agree, however, that the flotation release devices "would activate the torsion spring and shut the flapper plate upon presence of sufficient liquid within the housing assembly". Keep in mind that any "external movement activation devices which would swivel float weight releasing torsion springs and activating flapper plates" could cause the "activation of either or both plates" and "can be detected by an activation indicator" whether it's "connected to appropriate alarms and/or safety shutdown mechanisms" or not. As to the rest of the points you make during your post, "I completely agree with them, except I still think it's part of a kerosine lamp."
