Hi n jr,

What is the purpose of the check valve? My thought is your opposite. Check each check valve separately for malfunction. Also, your system needs to be completely air tight. Have you checked for leaks? What size is the mainline piping? Any gate valves on the mainline? Does your pump lose prime and hard to get flowing? What is the vertical distance between the pump and water table in the well? Tighten all fitting. Aloha.

The check valve is to keep the pump primed.
I don't know why there are two of them on the
suction side. The pipe from the well is 2".
1.5" brass check valve near the pump.
No gate valves. I'm thinking that the 2" check
valve down by the well is unecessary.When the well
was put in, the water really flowed,probably
about 25 gallons per minute before it was hooked
up to the pump. I haven't check for leaks. There's
a lot of yard to dig up. What do they use to dectect
a leak for 40' feet of pipe? Sounds like plumber
equipment?

Hi njr,

I believe the cv down by the pump is to keep the inflow full and the pump doesn't need to suck air in the intake line and lose prime. I don't really know what the one closest to the pump is for but it is probably insurance that the pump doesn't lose prime and worried about the other one leaking. JMHO.

The check for leaks is any visible fittings soap up(dish soap solution) or listen for sucking noises and tighten up fittings. If there are any buried fittings you are out of luck unless you know exactly where they are. Probably fittings closest to the pump vibrations would be the likeliest ones. JMOHO.

There has been many types of threads on these types of systems on this forum. You may want to do some research in the old threads. JMLHO. Aloha