That would depend on the temperature "Temperature pressure relationship" and the fittings used
Yes.
no
Any Spyder threaded barrels.
What does the schedule have to do with the material as schedule is the wall thickness Schedule 10, 20, 40 80 and 120 (XXH) The Schedule is telling you the wall (INTERNAL) thickness 10, 20 40, 80 and 120 XXH Whether it be steel, brass, galvanized and wrought ` About the pressure capacity, it is not the same because every material such as steel, brass, galvanized or wrought has a different strenght of materials.
A typical brass screw is a threaded rod with a head. It is not a slot at all.
Yes, you can either solder them or fit mechanical (threaded) fittings.
Yes you can do brass low and high pressure die castings.
Any pipe dope will work but Teflon tape is a lot cleaner.
Left and right nipple and coupling / union / TP coupling
You can put an aerator wherever there is threading for one.--I'm not sure of your description "brass faucet valve". - The end of the spout is generally threaded for an aerator.
Yes, brass can be welded using various methods such as oxyacetylene welding, TIG welding, and brazing. The specific welding technique used will depend on the thickness of the brass and the desired strength of the weld.
No, people should not turn green when working with brass. The green tint that can sometimes occur on skin when handling brass is caused by a reaction between the metal and the oils on the skin, not from directly working with brass.