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Old 08-06-2013, 03:08 PM   #1
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Black Flush Regulator

New problem. I drained the tanks today (first time in this location) and all went well until I started the black tank flush. The black and grey values still were open. Water started spewing out from the little black plastic regulator under the sink. I then realized it was part of the blank tank flush. I called a local Keystone dealer (25 miles away) - we are currently in Oregon - and he said Yes that plastic pressure regulators are breaking easily. So, he suggested I replace it with a brass regulator that is built much better and should last. I did make the replacement.

Now when I use the black flush I don't hear the typical "swirling around sound" that I had heard since getting this trailer. I left the black flush on and turned off the main water supply and held the toilet flush and sure enough it sounds like the tank is being cleaned with the black flush - just not the loud swirling sound I was used to hearing.

Options? 1. the pressure here is low and that might account for the difference? It is quite low and this is the first time I have used the black flush. 2. The new brass regulator changes things?

I don't care as long as the flush is doing its job - but wondered if others have had this experience?

Ideas?
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Old 08-12-2013, 10:53 PM   #2
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New to me; I've never heard of the black tank flushing system being inside the "house" part of the trailer. Our Grand Junction's system only had a hose connection outside with the PEX tubing running directly to the black tank, the backflow preventer was just prior to the black tank, under the floor. There is no water pressure regulator in the flushing system, it would defeat the purpose, because it is never closed, the spray-head is always open. At home my outside hydrants are unregulated,and line pressure is 100psi. It rinses the black tank very well, and the sound of the swirling spray is obvious.
As to low CG water pressure, I have experienced the same lack of spraying sound often.
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Old 08-13-2013, 07:10 PM   #3
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Ray is right in all he said. The flush system is a separate water line; there is not pressure regulation to it.
Only difference between flush inlet and city water inlet is flush inlets don't have check valves.
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