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Old 06-06-2019, 09:24 AM   #1
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Black Water Tank flush check valve

Other than replacing the whole thing is there something I can check to see if itís stuck closed and free it up?
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Old 06-06-2019, 10:25 AM   #2
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Here are 2 versions and you may have the black one. The clear one shows the internals. Water comes in from the bottom and pushes the disc up to seal off the vent to ambient and at the same time water pressure is applied to the horizontal output through a spring loaded check valve (ball) to the tank. If you pull out your valve these pictures should allow you to check the operation with either water or air. This may help.
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Old 06-06-2019, 05:18 PM   #3
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I know there's an anti syphon valve in the line.... not sure if there's a check valve (one way valve) anywhere.
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Old 06-06-2019, 08:26 PM   #4
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Quote:
Originally Posted by Oscarvan View Post
I know there's an anti syphon valve in the line.... not sure if there's a check valve (one way valve) anywhere.
They are one and the same. It's a vacuum breaker/check valve. A dual purpose valve as shown in previous post.
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Old 06-06-2019, 10:43 PM   #5
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Quote:
Originally Posted by bubbles View Post
They are one and the same. It's a vacuum breaker/check valve. A dual purpose valve as shown in previous post.
Ah.... now it makes sense.
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Old 08-10-2019, 03:22 PM   #6
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Originally Posted by gordonsick View Post
.....I do notice that disconnecting the hose to my black water flush does result in a bunch of clean water coming back out of the connection....

The same happens with my black tank flush. Anyone know if a bunch of water should come back out of the black tank flush connection when the hose is disconnected??
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Old 08-11-2019, 05:23 AM   #7
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The btf valve is at the high point, water runs downhill both directions once the pressure/vacuum releases. So yes ,water runs out of the connector
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Old 08-11-2019, 06:10 AM   #8
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The btf valve is at the high point, water runs downhill both directions once the pressure/vacuum releases. So yes ,water runs out of the connector

I get a lot of water forcibly. Definitely under pressure.
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Old 08-11-2019, 07:50 AM   #9
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I recently replaced mine with a brass Watts LF288A. The plastic one was leaking and there are lots of stories here about them breaking. You can also just replace it with a plastic 90 degree bend and use a backflow preventer made for a garden hose spigot. If you remove it, please use an equivalent somewhere in the water line feeding the flusher.

MartyQ, sometimes the factory installs them backwards and water won’t flow through them. That may be your issue. On my 2 trailers that have had a black tank flusher, you can hear the water spraying into the tank when the tank is empty.
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