Since I have my tank taken apart for the repair, I am going to post some of the PVC modules for others to see.
The first one is a regular by-pass module. It is useful in conjuntion with chiller, for example. When the center valve is open, and the side valves are closed, the water will by-pass the chiller/filter/etc. and go straight thru. When the center valve is close, and the side valves is open, all the water will go thru the filter/etc. You can adjust the ratio of by-pass by adjusting the center valve. I used a module of this type to throttle down a powerful pump so that I have great control over the flowrate range while the pump is pumping constant amount of water thru itself.
The first one is a regular by-pass module. It is useful in conjuntion with chiller, for example. When the center valve is open, and the side valves are closed, the water will by-pass the chiller/filter/etc. and go straight thru. When the center valve is close, and the side valves is open, all the water will go thru the filter/etc. You can adjust the ratio of by-pass by adjusting the center valve. I used a module of this type to throttle down a powerful pump so that I have great control over the flowrate range while the pump is pumping constant amount of water thru itself.