B Understanding Vacuum: 15HgV, 25HgV & High Viscosity Fluid

[FiveO]

Hi

First question:
In one end there is vacuum something like 15HgV, other end is something like 25HgV, in the middle there is high viscosity fluid that is pre vacuumed in 25HgV for any air bubbles. 15HgV , space, high viscosity fluid, space, 25HgV . Does the fluid move to the higher vacuum or stay in place?

Second question:
If I use vacuum pump in full vacuum(29.9HgV) and I want to split(Y - way) vacuum for two regulators, first 15HgV, second 25HgV, do I get 25HgV to the second regulator?

Thanks!

 

[Nugatory]

For the first question, what do you think happens and why? It may be easier to think in terms of absolute pressures.

I must confess that I don’t understand the configuration in the second question.

 

[FiveO]

I think the fluid move for the higher vacuum side. But can this help to stay in place - 15HgV , space, high viscosity fluid, vacuum tower with 15HgV, high viscosity fluid, vacuum tower with 25HgV ?

Vacuum regulators compensate the lower output vacuum with normal air pressure. So if the first vacuum regulator is set to 15HgV, does the second regulator can get to 25HgV or stay the same as the first regulator?

Vacuum pump - Y separator - first regulator on left Y side, second regulator on right Y side. To point... I want two different vacuum pressures with one vacuum pump.

 

[Lnewqban]

 

[Lnewqban]

Could you make a diagram, even with paper and pencil, and post it?

 

[FiveO]

I hope this helps.

 

[FiveO]

Ok. I try to explain again.
On the picture:

Q1 #1 What happens with blue medium(it is vacuumed with 25Hgv before put on the pipe). Do it moves to 15Hgv, 25HgV or stay in place?

Q1 #3 Same as like the firs question but with additional(2) 15Hgv port/tower.

Q2 #1 One vacuum pump with 29.9Hgv, 1 regulator regulated to 15HgV, 2 regulator regulated to 25Hgv. Do I get 25HgV on the 2 regulator or I am stuck with both regulators on 15HgV?

 

[Arjan82]

Q1 #1 and #3: it is about relative pressures. The blue goo will move from high pressure to low pressure with a force acting on it equal to the pressure difference times the normal surface area. Whether the absolute pressure is higher or lower than atmospheric is irrelevant, as long as there is no contact with the atmospheric pressure. So in both cases the goo will move to the lowest pressure tube.

Q2: If the regulators are mounted in parallel with the low pressure end connected but the high pressure end separated as shown in your drawing, you get indeed the pressures the way you draw them.