If clearing my MD clog requires lowering the pool water level to that of the two suction-line valves, I will most likely replace the two 60-year-old brass gate valves with modern "neverlube" ones. A search on the characteristics of NL three-way valves did not yield any positive answers to whether my desired upgrade is possible with only three such valves. I am therefore, soliciting advice as to the simplest configuration for achieving the following:
1. Valve (or valves) to rout either MD or skimmer suction line to the pump, both lines to the pump, or stop the flow of both lines.
2. Valve (or valves) to allow return water from the filter to either pass through the heater, or bypass it.
3. Valve (or valves) to allow water from a "T" connecting the heater & the bypass to go either directly to the pool return line, or split the
return between the pool return & the inlet to the pool cleaner's booster pump. The output line from the booster already has a PVC ball-valve
inline, to isolate the 2nd pump, so no modification is needed there.
( yes, I am a lazy B****** )
1. Valve (or valves) to rout either MD or skimmer suction line to the pump, both lines to the pump, or stop the flow of both lines.
2. Valve (or valves) to allow return water from the filter to either pass through the heater, or bypass it.
3. Valve (or valves) to allow water from a "T" connecting the heater & the bypass to go either directly to the pool return line, or split the
return between the pool return & the inlet to the pool cleaner's booster pump. The output line from the booster already has a PVC ball-valve
inline, to isolate the 2nd pump, so no modification is needed there.
( yes, I am a lazy B****** )