No check valve... ?  

rm_toohotque 51M
78 posts
6/7/2005 1:39 pm
No check valve... ?

My connection didn't put the check valve into the line at the pump. I pulled it out and am working on getting it into place. Reduced back pressure at startup may make the difference in allowing the pump to start and run without tripping the 5000W inverter surge limit. It seems possible if water travels up the line through impellers to apply reverse pressure when starting. With the check valve, reverse pressure is from the volume within the pump and water is forced up through a small opening at the edges of the valve. Even when open during upward flow the valve could have some effect, but in starting there is no 15-foot column of water pushing in on the impellers.

I can't keep holding a dog stock. I tuned into Kramer last night on CNBC and found a source for hitting trades.

Rain here is stopping progress as I need the road to dry up before pouring last of concrete.

-o0O0o


rm_toohotque 51M
179 posts
6/8/2005 3:51 pm

Variable flow motors are expensive. I located a used 1/3HP Franklin replacement motor for $99.00. It will reduce the startup surge somewhat. Also, I estimated a 1/3HP motor will draw 7 amps running (vs. 10.) That would be nice too!

The check valve didn't help the motor start. It seemed to make a slight difference but not enough.

I'll work around the 1/3 HP motor as the smallest possible 115V motor.

If everything fails, then I'm looking for a Franklin 12V replacement for their line of submersible well pumps. Since it seems borderline on starting with the 1/2HP motor, there's a good chance the smaller motor will start.

-


SuddenlyFree2 53M

6/7/2005 2:31 pm

Well, it sounds like your pump is fixed displacement. If it were a Variable displacement pump with a pressure regulator attached, you'd simply set the flow and pressure very low at start up.....


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