Check Valve

Where is the need of a check valve in a line of gravity dependent free flow, harvested from roof?

If you have more than one branch running off the downcomer, you need a ball, gate, butterfly type valve, not a check valve.

There are also in-line flow restrictors that are not adjustable.

Beyond that, I have no idea what you really are trying to do.

If this isn't homework, why not telk to your valve supplier. They will want to help you, since they will sell you the valves.

Is there no choice other than to install this questionably required valve "...under ground as verticalar without any maintenance chamber."? This seems short sighted as well as a road to problems in the future.

எதுக்காக? What for? A check valve prevents back flow.

Rain water flows through the down spout into the sump or the ground water recharging pit. Are you having a different application?

In this case, it is supposed to prevent back flow to where?

Most check valves for water have an exterior spring and arm. If you direct bury this check valve, I do not see how it will operate properly. Also, this seems unneeded. If you are concerned about connectivity to the potable system, a PRZ would work better.

I see no need to install a check valve on a gravity fed system.

If you do anything, make sure you install a mossie-proof net on top of your rain collection barrel, lest it become a Mosquito breeding ground! You don't want to get bitten and come down w/ Malaria or West Nile Virus....

ckaraman34

Mate, do you reckon you could provide a sketch of your proposed arrangement?

No maintenance chamber now will have you building one later on....unless this is a short term solution to a temporary need and will be abandoned post immediate benefit.