automatic air bleed valve

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automatic air bleed valve

Post  gwoodward on Fri Apr 08, 2011 4:35 am

I read a post with a photo of an automatic air bleed valve. It looks like it was made from stainless steel and brass. Does anyone know who did the post. It is buried in a post and I can't find it. I want to make noe for my nozzel.
Thanks
Glenn

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Re: automatic air bleed valve

Post  liteglow on Fri Apr 08, 2011 4:41 am

I think it was mario.

Btw, do you have a water tank for your nozzle where it stands ?
I drilled a tiny tiny hole in my nozzle 0,5mm thick !
And that hole work perfect as a air bleed hole.

First the air comes out, and when there is no more air a tiny drop of water comes out every minute.
And that tiny drop of water fall back into the water tank Smile works perfectly.

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air bleed

Post  gwoodward on Fri Apr 08, 2011 8:01 am

Liteglow,

Thank you for the tip. I'm going to try that idea, a lot less work than making the assembly. I'm hoping to fire up my nozzel sunday. I just recieved two selonoid actuators for my cutter. There pretty fast 50 millseconds for 12.5 mm of travel. Exactly where did you drill the hole? at the top of the face plate on on the top of the 8" pvc housing or does it really matter?
Glenn

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Re: automatic air bleed valve

Post  liteglow on Fri Apr 08, 2011 8:43 am

I drilled my hole in the top on the PVC tube (not on the top plate) !
Remember that the water should not travel into your water jet output.

And the hole I drilled is tiny tiny tiny Smile

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air bleed

Post  gwoodward on Fri Apr 08, 2011 8:52 am

Thanks for reminding me about not getting water near the output hole.

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Post  gwoodward on Mon Apr 11, 2011 8:47 am

I tried my nozzle yesterday, sorry I don't have any photo's. The ones I took are pretty poor quality. I first tried the stainless steel insert with the .5" (19)mm hole, the stream was 6'6" high x 12' long. I then tried the .375" (9.5) mm insert. The stream was 10' high x over 12' long. I have a ball valve installed on the output of the pump so I can throttle down the pressure without restricting the pump. The stream was very laminar except for the last 1 meter, the stream seems to wobble a bit and the stream doesn't enter the water very smoothly. Any suggestions? Maybe that's because the catch basin I am using is a little small. I didn't try changing the angle of the nozzle.
The stream is very smooth, the arc is very stable. I think the 2 low pass filters I'm using are doing the trick. I'm using a small low pass filter on the pump and a 2 gallon low pass filter before the water enters the nozzle. The hole I drilled for the air release is too big, I'll have to plug it and buy a smaller drill bit. Thanks for all of the help, my nozzle works pretty well for the first time out. The o ring groove I machined in the insert makes changing it out a breeze.

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Re: automatic air bleed valve

Post  liteglow on Mon Apr 11, 2011 10:19 am

Great to hear Smile

I did remind you to drill a tiny tiny hole...
You can heat up a PIN and stick it into the PVC nozzle, and pull it out again, then you got a tiny hole.

If the water not stays laminar to the end, it`s the law of physics that appears then Smile
You can try to tilt the nozzle down, less pressure, and maybe a low-pass filter (oh you have that?)

I think your system is OK, the length and thickness of water is what will decide how far and high it can travel.

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air bleed

Post  gwoodward on Mon Apr 11, 2011 10:39 am

yes, you did remind me the hole needs to be tiny tiny, I use a .4mm drill bit but it is too large, no worry I can close the hole. I'll try the hot pin idea. I was trying to get a range for the arc when i did my test yesterday. I will build somesort of mount tilt system next.

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Re: automatic air bleed valve

Post  pepe6859 on Tue May 03, 2011 7:01 am

gwoodward wrote:yes, you did remind me the hole needs to be tiny tiny, I use a .4mm drill bit but it is too large, no worry I can close the hole. I'll try the hot pin idea. I was trying to get a range for the arc when i did my test yesterday. I will build somesort of mount tilt system next.



Before any further change, first close the vent hole. You are saying that there is too much water comming out from there right? Well, this can be affecting the hole work.


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Re: automatic air bleed valve

Post  jetty on Mon May 09, 2011 8:50 am

You can find it here:

http://laminar.forumotion.com/t6-magic_nozzle-s-laminar-project

Looks like you'll need to do some machining though. I've used one of the automatic irrigation drain plugs from home depot for this purpose. Not as elegant a solution as the nozzle in the link, and not as simple as a small hole.

The irrigation drain plug bleeds the air, and then when it's gone, a very small dribble comes out of the top, probably equivalent in volume to the "Pin" method.
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Re: automatic air bleed valve

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