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How trustworthy rotary fittings are? - Page 3

post #21 of 32
The key with 90's is not to apply to much pressure when installing the tubing. You need to counter the pressure on the other side.
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post #22 of 32
Honestly, I wouldn't worry about external O-rings drying and causing a leak. They stay soft for a long time in open air. You might want to check the tightness from time to time, though, just to compensate for the tiniest amount of drying out...though it should be extremley minor with quality o-rings. The bigger concern is internal o-rings in rotary fittings, as they are prone to wear and leaking if people play around with them instead of just installing and rotating them only the amount needed. They aren't toys wink.gif Still, some companies sometimes just ship out loose rotaries, so you should keep an eye on things, at least for a little while.

And if you're really worried about any leaking around threads, just use thread tape. It costs next to nothing.
post #23 of 32
Just about to order some EK PSC rotaries, anyone heard anything bad about them? trying to avoid a leak at all costs.
post #24 of 32
Not heard anything bad about EK rotaries. However, nothing is fail-proof. You might try taping some toilet tissue around any worrisome joints to see if you get any leakage.
post #25 of 32
Cheers smile.gif
post #26 of 32
Thread Starter 
Thanks guys...

Your feedback has persuaded me and I will use quite a few rotaries for my loop (probably number 1):

300
OR
300
OR
300

As you see, my rotaries have no compression fittings attached - something i would prefer- but still i have not decided if i should stay with my current tubing (as per Martin's preference smile.gif ) 7/16-5/8 or should change to the most popular 1/2-3/4.

I will use compression fittings, but for that size of tubing 7/16-5/8 i have to use separate items for the rotary part and separate for the compression fitting (by Bitspower).

Of course, if you guys believe i should prefer the 1/2-3/4 instead of 7/16-5/8, i am open to suggestions...

(7/16 is perfect for a good seal on 1/2 barbs, but since i will use CF, i dont know if its still the best size to stay with)

Thanks!
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post #27 of 32
There's no performance difference from 7/16" ID to 1/2" ID, so the only reason to switch now would be if you want to save money on fittings by ordering rotaries with compressions built-in. That's definitely a valid reason though, it doesn't take much savings to justify the cost of new tubing.
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post #28 of 32
Thread Starter 
Well, what also concerns me is the ability for tighter bending which I think is better with the 7/16-5/8.... or not?
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post #29 of 32
I've only had experience with Bitspower 90 degree rotary's. I had them in a setup running for about 6 months. Worked perfect. Moved them into another setup in which the rotarys were turned in a direction they were not in previously and they leaked ever so slowly. About one drip per couple of hours. My guess is the o-ring inside was slightly pinched from the weight of the hose+water and when not in the same position slightly leaked from the pressure of my D-5 pump.

Could have been a very bad situation if i hadnt leak tested. One of the fittings was directly over my 580's
post #30 of 32
Quote:
Originally Posted by z0so View Post

I've only had experience with Bitspower 90 degree rotary's. I had them in a setup running for about 6 months. Worked perfect. Moved them into another setup in which the rotarys were turned in a direction they were not in previously and they leaked ever so slowly. About one drip per couple of hours. My guess is the o-ring inside was slightly pinched from the weight of the hose+water and when not in the same position slightly leaked from the pressure of my D-5 pump.
Could have been a very bad situation if i hadnt leak tested. One of the fittings was directly over my 580's

This. You should not put too much pressure on any type of rotary joint. Also, using the natural bend in tubing can help as well.
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