Help with valving - what can be safe to open/close

[toofast]

I tried searching a bit and could not find an answer, so here we go.

I have 2 main drains and one skimmer for intake on 2" rigid PVC and then 3 returns.

Each line has it's own jandy never lube valve.

Question is, when I am say vacuuming or if I want to do a super skimming job, is it safe to turn off both the main drains, and ONLY have 1 input or would that somehow put too much stress on the system.

Is there a formula or something that says with this size pump, etc...you should always have 2 intakes operating, etc.

Also second related question....can I open and shut the valves WHILE the pump is running, or is it best practice to only open/close with no pressure against them.

Thanks in advance!

 

[jblizzle]

You should be fine just having one suction line open ... my pool only has one. Your flow rate will be lower.

You can also slowly turn them with the pump on, just never close all of them on either side of the pump at the same time.

 

[toofast]

Ok thanks much! That was easy...love this forum!