easiest n cheapest way?

bend the arm downward

and tie some empty mineral water bottle at the end

problem solved

zero cost

rumah TS ni air tank dia kat atas siling. kalau bocor .....habislah....no need 1 year .. air tangki can jatuh already

you have two outlets which have the check valve

either one may caused the problem
this is a spring check valve

i always prefer a swing type check valve

the spring check valve got a plastic disc attached to the spring. like some forumer said, the backflow pressure is too strong that it pushed the valve open

This valve might help for my dad's place.
Currently the pump is pushing water to the 2nd floor to the tank, then from tank flow back down.. but the pressure is super weak.
If i make a t before the tank with the outlet of the tank do you think this would help?

clean inside the float valve.. maybe got debris inside

Pelampung not big enough. & try clean the stop valve. After a long period of time, they stainted and difficult to push in.

As what lucifer mentioned, the issue lies with your one-way valve. Instead of visualizing the water flowing out of the tank and into the main pipe, you should visualize it backwards, say main pipe water flowing into the tank outlet pipes (stopped by the one-way valve).

Its a piping system that says in case no pressure from mains, tank water pressure will take over. If got main pressure, it will top up your tank and bypass the tank water usage for outlet 1 and 3. Since one of the one-way valve is faulty, then system fails and it will flow main water into the tank non-stop.

One of the two valves is faulty but my best advice is to replace both to save time from testing which valve is faulty. Just go to any hardware shop and ask for one-way valve with the correct size (measure your pipe diameter). Also, my advice on replacing both the valves is to sumbat outlet 1 and 3 from inside the tank (with a thick cloth and must be tight) and off main pipe tap. Drain the water in outlet 1 and 3 (Just open any tap to outlet 1 and 3). Do valve replacement with two pipe wrench. Don't forget to apply fresh Plumbing tape (white tape).

Too bad my house tanki piping system isn't like that and whenever water shortage, all the taps connected directly to the mains will run dry. 

maybe u can try tie some light rope or benang to tank outlet for outlet 1 and 3 inside the tank for simple visual inspection of water back flow due to failing valve..if any failed then better replace them both

Its a good way to test but considering risking more overflowing water from the tank, might as well get it done before your water bill sky rockets. 

My problem was a bit different from yours.

Last time, my reservoir tank got leak, causing the water to FOREVER enter the tank and for 3 months, my water bill skyrocketed like crazy. Actually a very tiny crack at the bottom near the edge. Solution: put the silicon sealant (water proof) at it and problem solved.

But then again, it happened again. This time i suspected my water pump which i put near the main had caused the water pressure to hammer the tank and perhaps the check valve couldn't stand it. Some more, my water pump was faulty and in the end, i removed the water pump permanently.

Problem solved till today.

So yeah, i  guess the water pressure being too strong is highly likely the main cuplrit.

You can go and saman SYABAS nao. 

But if there is no water from SYABAS, the water would flow back to SYABAS main line?
of course i think SYABAS water meter is single way as well.

BTW the sketch of water flow i wrong i guess.
one way valve for master bedroom is wrongly indicated.

Its obvious the float ball has punctured and there is water inside.

still not solved? 

Just for my information, how long does it usually fill up a water tank from empty?

Hi guys,

I'm having some kind of weird problem that I cannot figure out the source.....

My water tank is overflowing like waterfall dei...not sure if it's related, but it happened right after the maintenance by SYABAS in gombak area (batu caves).

Went to the bumbung to check, panjat here panjat there, found the tangki..opened the tangki, checked the pelampung, ok i think it's time to change the pelampung..damn hard to unscrew it..

So the process of changing the pelampung went well eventually. I thought I have solved it..but after a few hours, started overflowing again.....   

Went back to the bumbung, suddenly tengok-tengok, the tangki full (above normal level).. Turned off main pipe, opened some taps to reduce the water level in the tangki..then checked the pelampung back again.. here are some pictures,
1) Checking the newly bought and installed pelampung set... Tangki is being filled..

[attachmentid=5182311]
2) Tried hand-stopping the pelampung, good, no water dripping...

[attachmentid=5182312]
3) Water automatically stopped, meaning no dripping. confirmed pelampung ok..

[attachmentid=5182313]
4) Now the water level still rising, until the pelampung also tenggelam....started overflowing again...

[attachmentid=5182343]
Now i really pening what could've caused the overflowing problem....I suspect it's the non-return valve.. But, well.. i don't know where it is, don't know what it looks like..and too many pipe connection...lol..

Can someone help me pleaseeee....tension gila!
------------------------- UPDATE ---------------------------------

Went back again to the roof, to take some pictures of the pipe connection just in case some one can help pinpoint the problem.

THIS IS THE FIRST TIME I WENT TO THE ROOF, SO VERY THE MESSY...NEVER KNEW SO MANY SAMPAH SARAP HERE LEFT BY THE OLD CONTRACTORS..ISH ISH ISH       
1) Is the red circled the NON RETURN VALVE? The black pipe is the main pipe from outside into the tank.

[attachmentid=5182339]
2) Is this too?

[attachmentid=5182342]
If the non-return valve may be the cause, how much would it cost? can D.I.Y ke???? easy?? if can, I might do it myself... hujung bulan no gaji yet...     
The flow of the piping:

1) [attachmentid=5182656]

2) [attachmentid=5182659]

3) [attachmentid=5182664]

4) [attachmentid=5182665]

5)[attachmentid=5182668]
-----------------------------------------------------------------UPDATE 1ST NOVEMBER 2015-----------------------------------------------------------------
So I finally went to the hardware shop and bought two Check Valve (3/4") size..

Started to operation roof!! While going to the hardware, opened all taps to empty the water from the tank.. Then started opening the first suspected Check Valve.. It was soooo ketat to open had to use extra force.. I thought that was hard, but removing the previous pipe tape (the white tape) was even harder!!!!!

Here's the pic of the old check valve.. I THINK THE SPRING IS NOT WORKING ANYMORE. PUSHED EITHER SIDE, NOTHING MOVED. SO YEAH I GUESS THE SPRING IS NOT FUNCTIONING ANYMORE
Front

[attachmentid=5225135]
Back

[attachmentid=5225136]
And here's the pic of the new Check Valve.. The spring works wonderful..

[attachmentid=5225137]

[attachmentid=5225138]
Changed two suspected Check Valve to avoid double work.. I accidentally left one of the old check valved on the roof, malas nak ambil lagi.. later ambil lah..haha

Cost?? RM30 for one Check Valve (made in italy woi!!), and RM3 for the white tape..total with GST = RM67.30 (IINM)..

This is the first time my operation roof.. Hopefully with the lack of skills, I am able to solve my problem. Checked at the joints, alhamdulillah no leaking or evidence of water outside of the valve.. I hope the connection is tight and secure..

Tank is still filling though. I'll update if it still overflows....hopefully not!!!!! Touchwood!!

after replaced the two Check Valve (3/4") size..
overflow problem solved?

thanks ..

yes.. problem solved till now.. haha

Dude. Your plumber fcuked up the water inlet and outlet already. 2 pictures already exposed the problem. One of it is this,



If you link the inlet and outlet, once the tank fills up and stops, the additional pressure will go to the second outler pipe. Assuming second pipe also stops due to normal faucet on/off, the water pressure has to go somewhere, it goes back to tank la. hahaha.