I have a portion of my bypass water going to the SS heater coil in my woodstove and since it goes high above the rest of the system in order to clear a doorway I ran into some issues. All goes according to plan once I force the water up and over. However if there is a power interruption either by me or the power lines I immediately loose the prime and the coil is emptied and soon overheats and melts the pvc fittings.
So what I needed was a check valve that would not create any back pressure as you all know how precious flow is in AP and I had no idea where to find such a valve in at least 1". I thought about it for a while and came up with a nice simple and cheap solution. It has been working perfectly and next I will install one in the sump pump line as well. So here's the plan. I believe all is explained in the photos but let me know if you need help with it.