Double sewer anti-backflow flood valve installation

Here's how to fit a big dirty 160 mm double anti back flow sewer valve to keep the town's nastiness out of our manhole in case of flood!
Sewerage maintenance. underground drainage
Links to buy things:
110 mm anti flood valve
amzn.to/3uBwNhO
160 mm anti flood valve
amzn.to/3b694yB
to make a double valve you can put two in line.
you may also need a slip coupling
110 mm amzn.to/3b5Dstg
160 mm amzn.to/33n6uA2
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sewer flood valve (Check Size): amzn.to/2ZHeQkL

[@r3tr0nic]

Great work mate. Always good to have these, no matter where you live. Keep backflow out, as well as any potential activity from mains cleaning and etc... Good to keep a manhole for servicing them too. I like to open and inspect them per annum to make sure they actually fully close and do not have any caught debris in the valve seat.

[@J55S]

A joke about lubing up the poop shoot seems fitting.

[@deathmerchant8662]

Fucking excellent work. Everytime you do the minimum you can expect the maximum amount of failure. You sir have done the maximum and can expect the minimum amount failure. Well done.

[@frankie2234]

Very nice job. You saved a lot of money diy.

[@lordhoho1]

Very precise work you are an artist

[@lassei4659]

thx for the video. But i dont hope you have downsprouts and other rainwater drains befor the anti-backwater part. If you close it off due to backflow and the rain still poors down, youll end up with rainwater in the basement, if thats the case you will need a larger model of the Kessle that has a pump, same goes if you have a multiple floors, you then need the automatic model with alarm and pump.

[@bootsowen]

Maybe I didn't explain it clearly enough, but in the adjacent manhole there is a very old pipe that acts as a flood interceptor, this want it's original intention, but it seems to work that way, The one time it did flood the backflowing water along with all the house rain water filled up about 20cm in the manhole and then departed through the big old pipe. Luckily for me this is ever so slightly below the cellar doorstep and so we weren't inundated. Now, with the backflow valve, if there is a flood, it will only be with rainwater and not with municipal sewer water. I'll take rainwater over sewage.

[@H0DLTHED0R]

Great Job. Very neat & solid.

[@bootsowen]

Thanks very much, The reason I fitted it was because I saw what it was like when the pipe back flowed. 150mm of water packs some punch. Just waiting for some floods to test it!

[@seandoyle3251]

We need that system here in NY . Had some heavy flooding this passed week

[@williambudd6992]

Very good video

[@wooddawg4868]

One thing about this system is if you ever have to have your main drain snaked out you MUST HAVE this systems flappers raised or removed to sewer cable can be pulled back through or install a clean out on discharge side to sewer snake and power washer access. This valve sytem does have it where you can remove the tops of each valve for access to flapper just as long as you do not cover them up, also red levers can be locked in open position.

[@bootsowen]

Hi Frank, Not quite, these flaps can only be locked shut not open, so if you want to jet it you have to open the downstream lid and jet from there, it happened this year: kzbin.info/www/bejne/jISWmn2cg6mfirs but having the flaps in place and the manhole made it easy. Thanks for the comment.

[@jimreitenbach6023]

Nice job 👍👏

[@neilwatcham8932]

Should of used 2 slips boss. Gonna have a gap now between pies of 50mm.stuff will get caught up....

[@bootsowen]

You are right about using 2 slips, would have made a nicer job. But since it was done, over 6 years it hasn't had an issue. Nothing caught! I would do it your way next time.

[@Couch_engineer]

Looks good.

[@rufusmedrano2962]

Good job

[@mrsancho691]

what kind of material is,it works with PVC ?

[@croywedgewood2499]

I can see one problem with this set up. What happens if they have to run a snake through that line because you get a plug-up? The snake will go in but when they go to pull that snake back it's going to shred those valves, no? Shouldn't those red handles lock them open for just such a case? Hey, here's hoping they never see a snake anyway. Nice job and lots of work, no doubt.

[@bootsowen]

I wondered about that. There are two options, the first is to rod from the other way, that would work except there is no access in this case. the second is to rod or jet as usual through the two door flaps. then when /if it clears you can open the hatch lid bolts. this only takes a minute, (but obviously you wouldn't want to do it if there is a backlog in the adjacent manhole.) with the lids off you can hold the flaps open, or lift them out. the red handles are to lock them shut. I guess it also depends on the shape of the snake head that you use. I hope I never have to do this! It has been in about two years no and works well still.

[@brianheppell4506]

great work ! , but i think the high pressure from the snake would not have to go past your valves ?

[@rufusmedrano2962]

Double check valve

[@Gizmologist1]

There are no clampsto secure the valves in place?ust friction? Definitely would not be permitted in the US.To install the same type of system here in the US, we have a heavy duty rubber sleevy with a stainless steel fumm diameter hose clamp to tight down on both, one over the pipe, the other over the fitting ends.

[@martincoleshill7000]

Hi, great vid. I also need to have a man hole and non return valve installed (as currently having sewer water back up entering my basement), and was quoted 7k! Is that a realistic price if not doing it yourself? Just found your channel, very cool mate 😎

[@bootsowen]

For what I did there was £500-1000 parts and a competent person should be in and out in two half days. £3000/ day. I’ll be with you tomorrow. Lol. I guess it depends on what the ground is and how deep. If you need specialist equipment to shore up a deep hole etc etc and if the contractor has to remove material costs go up and up. Maybe £7k is reasonable. The reality is that there is not much to it.

[@ShadowGamer10675]

What happens to the sewage inside if the valves are closed?

[@bootsowen]

It stays inside.

[@POlley2]

I was wondering if you knew what the fall (or angle) was on your existing pipe? The double flap valve you show is I think a product made by karmat.pl If so, the output spigot is 34.4mm lower than the input. I therefore wondered how you installed this in a retrofit situation such that there is still a fall internally, unless your existing pipe had a significant fall on it.

[@bootsowen]

I didn’t even consider it. It has a fall but probably much less than 34.4 mm in the ~800mm length of unit. Since installed I have no way of knowing if it worked. I check and clean it every couple of years. And we have never had a back flow since.

[@POlley2]

@@bootsowen Many thanks for your reply. Interesting, quite possibly the slope is such that it works, even if it isn't ideal. Between the time that I commented and your reply, I received a response from karmat.pl In case this helps anyone, they advise that with their double flap valve, the installer will need to expose approximately 5 feet of pipe (so approximately 1.5m) in order to achieve a miniumum slope of 2% in a retrofit installation. My take on it is that in that instance one is likely to need adjustable angles on the 110mm pipe in order to maintain the slope and connect to the existing pipework. In my installation I just can't easily expose 1.5m of pipe. I found a double flap non return valve from redi.eu with an offset of only 7mm, designed specifically to cut into a short length of the existing pipework.

[@POlley2]

Update : the UK distributor for Redi advises that their non return valves MUST be installed level, in order to guarantee they will function as intended, and therefore, if installing into pipework that is on a fall, some additional work will be required connect the level valve to the pre-existing pipework.

[@willjones3908]

Excellent work!! Have you had any big storms since fitting it, and how did it handle them? I am about to do exactly the same thing.

[@bootsowen]

Hi there, we have had some good storms, but nothing like the one that made me fit it. The thing is that if it works correctly, i will never know.

[@willjones3908]

@@bootsowen Sounds like it's doing it's job! I've had 3 occurrences of the inspection chamber cover popping off due to backflow pressure during storms this year alone... I'm just deciding on the type of valve to use. Was there any particular reason you went for a double flap, other than for double security?

[@bootsowen]

@@willjones3908 Only because it wasn't much more expensive. The time in digging and the cost of the masonry is ultimately more than the cost of the valve.

[@rjstaffa]

What is the name of this valve? Where can one buy it?

[@catlook36]

if go into manhole ,is it easy to out? there is no iron step.

[@bootsowen]

no, it is a bad idea

[@mattmoreira210]

Double valve = two times the chance of going wrong.

[@scottrose3494]

Well good thing he installed a manhole for servicing

[@fixerdrew02]

what if you have to take a poo during a heavy rain then

[@bootsowen]

You thank yourself that you are only getting blowback of your own shit and rainwater and not the shit and rainwater of the whole city flooding your basement!

[@latenight6815]

The tank behind at 10:07 can work as a buffer when valve is closed

[@kippie80]

Why double valve? suggests to me it fails.

[@bootsowen]

I think the second one is for zombies.