Valve ID?
 

Okay, I know that there are many tubes of valves for inner tubes but I’ve only worked with Presta and Schrader.

On the bike I’m using , I came across these valves. What are they? My spares and pump are Presta, so I’m not worried about flats but I’m curious.

https://cimg1.ibsrv.net/gimg/bikefor...7dce6bcad.jpeg
As found
https://cimg2.ibsrv.net/gimg/bikefor...b3af97ea5.jpeg
After unscrewing what I thought needed to be opened to inflate

Same size as presta? Maybe a variation. I would just use it like a presta, loosen to inflate, but don't completely remove the cap or the valve might recede into the tube.

Kinda looks like a Woods valve, but not quite.

yeah, not like any typical Presta nor like the only weirdo I ever see, which is the Woods/Dunlop types.
What brand tube is this valve vulcanized on?

My first thought was that it was a replacement nut for a broken presta valve, like something that might come from Problem Solvers.

Yes, it’s pretty much the same size as a presta. Close enough that it didn’t register as some different until I went to check that my pump,was set up as presta and I encountered the silver bit . Good point on keeping cap on. If I need to adjust pressure, I’ll keep that in mind.

No idea of brand. I’d have to pull the tube to find out, which I would like to avoid. While the bike is older, tires are CST so I expect that tubes are also from the same part of the world.

This looks like an advancement on the Presta valve, in that the snout on the nut would appear to make the stem core much less prone to bending, while the plain-topped cap is less likely to snag on clothing or on a cleaning rag, etc.

Hopefully it passes air going into the tube with the loosened nut in place, but I don't see the sort of notches that a normal Presta core nut has for that purpose.
Perhaps then the core is somehow backed up so as to not be vulnerable to being blown into the tube(?).
You could test this by collapsing the tube against the other end of the stem as you push the core inward.

Regina valve.
From Wikipedia:

Regina

https://upload.wikimedia.org/wikiped...on_bouchon.jpgRegina Valve stemThe "Regina Valve" is very similar to the Presta and mostly used in Italy.[21][circular reference] The central threaded pin is so short that it does not protrude from the valve tube and therefore cannot be bent. In order to close the valve tightly, a small, loose nut is placed on this threaded rod with a diameter of only around 1.5 mm and screwed on by hand. A threaded rod is enough. By tightening the nut, the valve disc with the conical sealing body is pressed against the valve seat.

Rim drilling:⌀ 6.5 mm

Thread DIN 7756 • outside VG 6×32 •outside VG 5.2×24 at the upper end

Maximum pressure 15 bars.

Regina valve is a new one to me. But with the metal bit removed, a presta cap threads on nicely, so I’ll call it Regina valve and use it as long as the tube holds up. And I’ll try like crazy to make sure the little nut doesn’t go on a walk about.

https://www.bikeforums.net/bicycle-m...eo-whatis.html

​​​​​​https://commons.wikimedia.org/wiki/C...:Regina_valves

Looks like the number of possible threads is finite.