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Determining the right size, for mixing valve and pinch valve

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Determining the right size, for mixing valve and pinch valve

Postby Dimitris » August 4th, 2013, 12:53 pm

Good morning, everybody, - late evening in Greece!
In the photo below is the tank that is going to be the pressure pot. It is 14 ½ “- (370 mm) height and 4”-(100mm) in diameter, similar size with the PAB Model B Portable System. The size of the air fittings are 1/4’’, right side and top (abrasive filling port) and 1/2” at the bottom (mixing and pinch valve). What is your suggestion about the size of these valves: 3/8” or 1/2”?
As well as for the proper length of the stand pipe? : viewtopic.php?f=28&t=385

Ps: I will use the pressure pot for etching and finishing metals
Thanks in advance
Dimitris
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Re: Determining the right size, for mixing valve and pinch v

Postby JESS » August 4th, 2013, 1:03 pm

Dimitris-
Your nozzle will always be smaller than 1/4", so 3/8" will work, but both would do the job fine. The orifice of your nozzle should always be the tightest spot in the system.
Jess
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Re: Determining the right size, for mixing valve and pinch v

Postby Dimitris » August 4th, 2013, 1:41 pm

Hi Jess
For the mix valve I can find any size I want so there is no big deal. But the pinch is little difficult to find 3/8” (I’ll do more search, who knows maybe I would find a 3/8”), I’m glad that 1/2” can work to. For the nozzle size I’m thinking somewhat close to 1/32” (0.8mm) and 3/64” (1,2mm) maximum. I have made small silent portable compressor- planning to make a bigger one.
As for the length of the stand pipe what do you think?
Thanks
Dimitris

Ps: my compressor
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Re: Determining the right size, for mixing valve and pinch v

Postby Terry W » August 4th, 2013, 2:33 pm

Dimitris the little compressor you made looks great.

One thing if your mixing valve and hose are too large 1/2" and your nozzle is say 1/32 you may get whats called packing. The grit will try and push to the nozzle and then pack up and stop flowing because the grit can't flow out fast enough so you'll really have to play with the settings. I think if you can find 3/8 you'll be better off. Just my opinion.
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Re: Determining the right size, for mixing valve and pinch v

Postby Dimitris » August 4th, 2013, 2:50 pm

Hi Terry
Thanks for the suggestion I’ll try to find the 3/8’’ if not, then I’ll send e-mail to Airpinch if they can send to Greece, will see! As for the stand pipe inside the pot, thinking a length up to 3” max?
Soon I’ll upload photos of the project...
Glad you like my compressor!
Thanks a lot
Dimitris
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Re: Determining the right size, for mixing valve and pinch v

Postby JESS » August 4th, 2013, 4:44 pm

The one I used is about 6" long.
Jess

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Re: Determining the right size, for mixing valve and pinch v

Postby Dimitris » August 4th, 2013, 5:12 pm

Hi Jess
If you are using 6” !! I think that is better 2" max length for my small pot.
I’ll try to upload as soon as I can photos!
Thanks again
Dimitris
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