5 votes
Accepted

Transfer pump suitable for air, water and their mixture

The terms you are looking for are "self priming pump" and/or "run dry pump". Centrifugal self priming pumps require some water to be in them to start, but can pull a vacuum including air. Diaphragm ...
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  • 7,489
4 votes
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Replace mercury with silicone oil in diffusion pump

I did some internet searching and did not find anyone that had done a direct swap out. Granted, probably the majority of these replacements occurred before the existence of the internet ;-). As I am ...
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  • 7,489
4 votes
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deep vacuum in the 19th century

Geissler invented the so-called "liquid piston" pump using mercury for the piston. The basic idea of the design is to entrap some of the air between two volumes of mercury in a pipe, and then force ...
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  • 12.5k
3 votes

Inlet/outlet of a fridge compressor

The small tube I believe is for the freezer coil, or it could be a capillary tube (thank you Swift). Regardless, simply solder it shut and use the two larger lines for pumping. I would like to note, ...
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3 votes

How to regulate a vacuum pump?

The device you're looking for is called a vacuum regulator and sits between the vacuum source and the process. This page from Equilibar shows some examples and provides links that explain how they ...
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  • 2,135
2 votes

Vacuum vessel at 10mbar with a diaphragm pump: do I need a venting valve?

I am not a vacuum expert, but if you look at the technical data for your pump, you'll find this "Leak rate 6x10-3 Pa m³/s". I take this to mean that your 10 liter = 0.01 m$^3$ vessel will leak at a ...
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  • 2,511
2 votes

How do vacuum sealers work on a glass jar?

What they are doing in the video is heating up the liquid inside the vessel, (with an open lid). Then they take it out and immediately (i.e. before it cools down), they pack the lid. What happens is ...
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  • 22.7k
2 votes

How do vacuum sealers work on a glass jar?

Not checked out the video, but if you put a jar with a liftable lid in a vacuum sealer then as the pressure outside the jar is reduced air in the jar will push past the seal to equalize the pressure. ...
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2 votes
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Vacuum Pump Specs

Evacuating 10 psi of pressure from a 500 cu ft chamber in under a second is pretty insane. This is a good calculator, as you will probably need to change your parameters (most likely time) in order to ...
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  • 2,402
1 vote
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Can I use a standard HVAC rotary vane vacuum pump to draw a vacuum on a sealed chamber?

I have the same pump and I use it to hold (no flow) vacuum without any problems (my use case is to hold vacuum while in epoxy mixture so that all bubbles can be extracted before pouring it into the ...
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1 vote

How do vacuum sealers work on a glass jar?

They heat the jars and take them out of the oven open the lid to let the pressure out and then close it. Once the jar gets cooler the pressure inside that was occupied with hot expanded air settles ...
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  • 21k
1 vote
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How do I increase negative air pressure without inhibiting airflow?

I'm not sure what the first paragraph was about (pickup tool?), but if the vacuum reserve is installed like you have drawn it, there will be no appreciable loss of airflow when the solenoid is open. ...
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  • 4,810
1 vote

Balancing suction air flow at different areas on pipe

I would suggest separate channels to each set of holes with orifice plates to limit the flow to / from each. That way you can control each set individually. The other solution will be to over-specify ...
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1 vote

Balancing suction air flow at different areas on pipe

It will be a next to impossible task to try and analytically predict the number/position/size of the holes in order to have exactly the same flow. Even if you do for a temperature and a set humidity, ...
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  • 22.7k
1 vote

How can I make a vacuum pump to move rocks from one place to another?

What you are seeing in the video is a vacuum generator/vacuum ejector/aspirator. Figure 1: Venturi effect (source: wikipedia) It uses the principle of the Venturi effect. I.e. that for steady, ...
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1 vote
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What kind of solenoid valve should I use for vacuum?

A pilot operated valve (often unfortunately generalized as a "solenoid valve") uses a small control solenoid valve and the pressure differential across the valve to open a diaphragm that ...
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  • 7,489
1 vote

Vacuum Pump Issues

eatscrayons suggestion for leak detection is great. However, instead of acetone, I would use isopropyl alcohol (or even better, a helium gas source since He is such a small molecule). It is ...
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1 vote

Vacuum Pump Issues

6 Torr isn't too bad really and that vacuum pump looks a bit small and I am guessing is not a high quality unit? Also, as said in the comments, that water valve may be leaking as well as it isn't ...
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1 vote
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What is the formula to work out time to remove water from an open vessel with vacuum?

So if your fan doesn't produce a minimum of 1m of water (which is about 2.9 inHg), there would be no flow. Afterwards, it depends upon your fan curve. You would find that the system curve would ...
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  • 5,313
1 vote

Arduino CNC - which vacuum pump?

I would recommend a slightly less technical approach and use double sided sticky tape. It's wonderful stuff, and you can get what's called removable tape. Probably makes it a bit easier, but you ...
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1 vote

Vacuum vessel at 10mbar with a diaphragm pump: do I need a venting valve?

You will likely want more than just a vent valve - to avoid contamination of a vacuum chamber, typically you re-pressurize with an inert gas like nitrogen to avoid sucking condensates and water vapor ...
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