Back Water Valve

[chrmcd]

Hello, new to this forum- Hello!!!
Looking for some clarification on installing a back water valve in exsisting home. Concrete removed to expose pipes in basement... From municipal system 45* up into cleanout, to 4/4/3 wye into 4/3" coupling to 3/3/3 wye. All tightly packed. Can barely get the new mainline back water valve in using 2- 3" wyes and a 3-4" bushing placed into the 4" back water valve. This leaves just enough room to put it all together. Curious if going from 3" directly into the BWV would impede flow or venting at all. In a perfect layout I would be able to transition using another 4/4/3 from the 3 wye then a couple of feet pipe but unfortunately this is just not possible... Any prof. ideas on this or code requirements??? thanks in advance!!!

 

[frodo]

are you trying to install a 4'' back water in a 3'' line?


can not figure out what your doing,

 

[chrmcd]

All lines are 3 inch up to the wye (4/4/3) and the 4 inch clean out leading to municipal sewer system. Mainline only sells 4 inch BWV.

 

[chrmcd]

My proposal is drains from left side of house, which are 3" go to 3" wye, which is attached to another 3" wye servicing the right side of house. Short 3"pipe to connect to BWV that has a 3" bushing into the 4" opening of the BWV. Not enough room, short of removing tons of concrete- to install 4" anything on house side of the new valve. Old setup was tight with no room to add this valve... Hope that clarifies this????

 

[frodo]

....................http://screencast.com/t/D4q1buhGSd4

 

[chrmcd]

thanks but I am going from 3 to 4 not back to 3 again. Only 1 size valve available- they were talking about making a 6 inch, but that is not applicable here. Only valve accepted by insurance is the mainline fullport back water valve (http://backwatervalve.com/products/fullport-backwater-valve.html). I just need to know if going into this 4 incher with a 3 inch pipe would effect the flow or venting. I am inclined not to think so, but just want to clarify that. There is a reason why final cleanout and these BWV only come in 4/4- just not sure of the reason.

 

[frodo]

no problem at all,,aslong as you are not reducing after the fitting

use a 4x3 bushing reducer if you need room

or...if a real bind

3'' fitting is same size as 4'' pipe