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Old 03-19-2011, 11:29 AM   #11
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Quote:
Originally Posted by mtnguy View Post
I think maybe the black thing-a-ma-jingie is an anti-siphon device.......but I don't know why a check valve wouldn't work.
Hi Chap, I did some investigation of the original BFP and what I found led me to believe why it would work as long as the water pressure was low:
This is a picture of the original BFP and all of its internal parts. And here is what I think was happening with the original one.
In the picture you can see the little piece of white plastic. That piece pushes into the BFP after the spring and ball are in place. What I found was that the little white plactic piece would come out of the BFP and slide into the water line where the collar nut was. This would allow for room for the spring to enter behind that plastic piece causing the ball to travel further then it was designed to. That's when ball would jump back and forth causing the water to bang and closing off the water supply. Then in my case if you would kink the hose line going into the trailer the ball would re-set. That's when I would release the kink slowly and would here the water cleaning the inside of the tank. Once I would release the kink compeltely the ball would start bouncing back and forth creating the banging sound and then seal in the closed position, thus allowing no water to enter into the tank.... Hope this all makes sense.
With the brass BFP all of its internal parts can't be removed so life is good...
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Old 03-19-2011, 05:57 PM   #12
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Bill,

I just checked and have the same unit, mounted the same way, in my camper. I never noticed the buzzing noise of the turbo flush stops occasionally here as well. Your fix is on my summer "to do" list.

Thanks,
Lou
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Old 03-20-2011, 11:24 AM   #13
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Quote:
Originally Posted by herk7769 View Post
Bill,

I just checked and have the same unit, mounted the same way, in my camper. I never noticed the buzzing noise of the turbo flush stops occasionally here as well. Your fix is on my summer "to do" list.

Thanks,
Lou
Glad to have helped you out Lou. I also located this BFP from Tweetys RV, but didn't order it and just stayed with what others have used. I think the only difference is that it has male threads on both ends. This would have have saved me one fitting only. Here is a pic of that one:
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Old 03-20-2011, 02:00 PM   #14
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Bill, could you post the link to that fitting? I will order it when I get home.
Lou
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Old 03-20-2011, 02:16 PM   #15
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Quote:
Originally Posted by herk7769 View Post
Bill, could you post the link to that fitting? I will order it when I get home.
Lou
Here is the link to the male threads on both ends:
Back Flow Preventer

Here is the link to the one I used (Check Valve, 1/2" MPT x 1/2" FPT ):
Check Valve, 1/2" MPT x 1/2" FPT

Cheers,
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Old 03-25-2011, 10:56 PM   #16
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Hey Lou did you get the info on the valves???
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Old 03-26-2011, 07:30 AM   #17
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I did. Thank you. It is on my "to do" list for next week when we get home.
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Old 03-26-2011, 10:39 AM   #18
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Good luck to you with the replacement valve.....
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Old 04-29-2011, 10:49 AM   #19
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Pressure regulator

Do you need to use a water pressure regulator on the black water flush outlet.

It was recommended by my dealer to use a seperate hose for just this purpose but they never mentioned if I needed a water pressure regulator.
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Old 04-29-2011, 11:05 AM   #20
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I do not. I figured the more pressure the better.
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