That moment that one of your ideas works, and works awesome ( rare). I added a valve from a tire to my pump sprayer, then I hooked up my car tire pump, with my homemade battery bank from laptop batteries. It pumps to 50 psi, and I don't have to pump the sprayer anymore for spraying my plants!!! This is part 1 of me making a foam device for air crete. I think i can put the battery bank in my back pack with the air pump will be portable !!
I rarely use sprayers so i have some questions. If the sprayer is full, how many times does a person have to stop and pump before its empty? If its more than one, can you leave the pump on while you are spraying ? That would be pretty cool.
It also seems that you are bypassing the portion that fails. When i say i use it rarely, it literally means i buy one, use it, then one or 2 years later when i have a use again i cant get it pressured up. I bet this trick allows it to work year after year.
Pressure blowoff valves are out there. Similar to what an air compressor has. Heck, i think there are caps for tire valves now that bleed off air if over inflated. I remember that being a cheat in nascar to maintain a set max airpressure from the heat expansion going 200 mph. Not sure if that tech has reached the marketplace. That would be in a range below 50 psi and as simple as drilling in a second air valve and adding the cap.
The question being whether you fill as needed or leave it running while you spray. If you refill, really dont need a blowoff. Maybe the sprayer already has one. Maybe there is leakage designed in the sprayer. Lots of stuff i dont know. Lol
Sometimes the answer is nothing
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