Beckett Injector Housing... why does....

[MediaOne]

Okay, I understand that when you enclose a beckett the idea is to make it air tight so that you can't put a valve on it and control the amount of air it sucks in with the water. I have read on many DIY sites that you need to make sure that you leave room for water to spit out of the venturi holes.

What's the deal... why does water come back out those holes if they are all sucking air in?

Is that why the valve is up high on the "Bullet" from PM, because they have left room inside their "Bullet" for some water to come out of the Beckett intake holes?

What stops the chamber from flooding? the intake holes sucking some water back in??

Thanks!,

 

[AnotherGoldenTeapot]

It's not really an "injector", it's a "foamer". For its intended use it does not matter if it leaks a little bit.

 

[FMarini]

Hi:
When the pump starts and stops water squirts out the holes, its only when the head is fully pressurized does the water not squirt out the holes. its a vacuum thing.
Actually the beckettvalve was designed as a fountain head and as such had no reason to contains water, so it squirts a wee bit of water out the sides, it adds up after a while.
Yes the reason why PM air valve is up high is to keep in the water, the water level eventually reaches the air holes and thats it.
If you want to read how and why a becketthead works check out my article
http://reefkeeping.com/issues/2002-03/fm/index.htm

frank