Once you open the little nut on the PV stem and burp the sticky surface of the check valve
the fact that the airpressure in the hose is greater than the air pressure already in the innertube does the rest.
But in reviews I see bunch of 1-stars complaining about issues with Presta valves.
people without any mechanical problem solving skills can still write reviews on the web..
Is there schrader valve adapters that I can permanently screw on top of presta and use them?
No, once you pump up the tire you close the little nut, then screw the adapter back on . for transport ..
plastic schrader cap on the adapter will keep the valve mech tidy.