The "Bow Tie" filter was on the KV side of the PCV system. It was a fiber mat material that allowed excessive crankshaft fumes to go out there if the PCV couldn't handle the correct flow direction during that time.
This was to keep the crankcase at times from being positively charged as there would always be a place to dump the pressure without letting it out to the atmosphere. Fumes went down the carb throat.
That fiber element inside the air filter assembly could also inhale through it's own filter into the crankcase when the PCV was actually working up to capacity and with idle-to-higher "normal" RPM. That way the crankcase could not get excessive vacuum in it, causing other troubles,
This flow of vacuum/pressure provided a vapor sweeping process to remove crankcase fumes - blowby and noxious gases and condensate from the crankcase, keeping it clean.
The CV-side of the PCV is the actual self-throttling valve with the little spring and rattling valve that plugged into the smaller grommet on the valve cover, whereas the larger grommet had the KV side pipe or fitting in it.
The higher the vacuum goes, the valve closes harder. Low vacuum, it's open all the way and usually rattles a little bit.
The PCV (Positive ventilation Valve - or Pollution Control Valve --- the word "valve" is redundant here) was attached to a convenient port usually under the carb - or in some cases into the carb itself - to provide manifold vacuum to draw through that PC valve down the intake runners to burn off the fumes.
That little 90° bent steel tube inside the filtered area - was for the A.I.R (Air Injection Reaction) pump suction so it would draw in clean air for the air injection - this was found mostly on motorhomes over 60001 lbs GVWR.
► Otherwise, the AIR pump drew air in through it's own filter around the diameter of the pulley with reverse fins to inhale fresh air. It was moving so fast that any debris would be slung out of the vanes and never enter the pump.
But since the BBs in the HD vehicles and motorhomes were not gonna typically get to 5000 RPM --- they used that other AIR intake like I mentioned in that 90° pipe inside the main air filter.
I hope that clarifies things a little bit.