5074 no flow ..........

[Herbie]

Noticed that my 3155 was not pumping water even though the pump was running . Unplugged it from the 5074 Calcium dispenser , and it pumped fine .
Diagnosed it down to a bad non-return valve . Will not flow anything through it .

Is it normal for these valves to go bad periodically ? No kalkwasser actually flows thorough it as its on the r/o side ???

Guess I will need to replace this valve to get the system up and running ........

 

[rvitko]

Try using a syringe to flush it with vinegar first, some kalkwasser will get back to the valve, especially if it is not elevated above the dispenser, their is a lag time where the pressure on both sides is equal and it stays open. They will eventually wear out, but we do use a US made check valve that is resistant to kalkwasser and we also pretest every one of them as well.

 

[Herbie]

Try using a syringe to flush it with vinegar first, some kalkwasser will get back to the valve, especially if it is not elevated above the dispenser, their is a lag time where the pressure on both sides is equal and it stays open. They will eventually wear out, but we do use a US made check valve that is resistant to kalkwasser and we also pretest every one of them as well.

Thanks Roger , tried soaking it , still ng . Guess the valve went bad.
Looks like I will have to order one .........probably out of warranty now, think its about 2 years old .

 

[rvitko]

OK, you can order them on Tunze.com, part 5074.010. An airline type check valve will also work, they just don't last as long.

 

[shifty51008]

Thanks Roger , tried soaking it , still ng . Guess the valve went bad.
Looks like I will have to order one .........probably out of warranty now, think its about 2 years old .

Did you try pushing water through it with a needle or just soak it? Ive found just soaking doesnt help but the needle does as it pushes the water through

 

[Herbie]

Roger,
Sadly , the brand new 5074 check valve has gone bad already. This time the opposite happened ...........now the check valve is stuck open . Had all the kalkwasser from the 5074 dump back into my top off reservoir . Luckily I had a PH Monitor alert me to the situation (Apex) . Ph was climbing pretty fast .
I pulled out the valve and checked it. It free flows wide open in both directions ??? Nothing I can do to get it to "stop" .
Any ideas on why this would happen so quickly ? I have seen them clog before, but never just fail open .
Its a brand new valve, just received it from Tunze ???

Thanks for any help .........
Herbie

 

[rvitko]

Is the valve attached so it is above the reactor? It should be in the input line but zip tied so it is above the bottle. Usually when they fail, it is open and usually because some powder jammed the ball open so it cannot seal, the reason it needs to be above the reactor is so that in the time it takes to close a back flow cannot get powder back into it. Usually if powder is the cause it can be flushed with a syringe and vinegar/water and will work again. If it failed mechanically, we would replace it. These valves are made in Minnesota and are semi custom for our purpose with talk resistant materials and we test them as well, we really try to get the best valve we can but given the need for a very low cracking pressure, it is not as solid as one with a higher cracking pressure.

 

[Herbie]

Thanks for getting back to me Roger.
Yes, its installed with the hose looped over the 5074 bottle and the valve above the reactor.
I will try some vinegar to flush it, and get back to you.
Its weird because its not just a little backflow , like a ball slightly stuck open. Its a wide open flow in both directions.

Will investigate further, and let you know.

Thanks !

Is the valve attached so it is above the reactor? It should be in the input line but zip tied so it is above the bottle. Usually when they fail, it is open and usually because some powder jammed the ball open so it cannot seal, the reason it needs to be above the reactor is so that in the time it takes to close a back flow cannot get powder back into it. Usually if powder is the cause it can be flushed with a syringe and vinegar/water and will work again. If it failed mechanically, we would replace it. These valves are made in Minnesota and are semi custom for our purpose with talk resistant materials and we test them as well, we really try to get the best valve we can but given the need for a very low cracking pressure, it is not as solid as one with a higher cracking pressure.

 

[rvitko]

Keep me posted, if it is a dud, we will certainly replace it.