Automated Pulsed Pumping

I believe it is also important to be fully aware of the different ways of measuring pressure.

It is not the same pumping at 3 in hg below ambient pressure that pumping at 3 in hg absolute pressure.

I assume there must be somewhere a thread talking about this?

Not sure I understand your point, here are some thoughts, please expand on your question.

I am trying to avoid discussing the differences in absolute pressure and gauge pressure as the majority of pumpers dont need to understand this to have a safe and effective pump program. Similarly I want to avoid a deep discussion on the effect of altitude on a pressure/vacuum gauge, gauge calibration, etc. It doesn’t impact most pumpers.

I will address it this way:

There is a rare situation pumpers probably need to be aware of. If you normally use a pump and live near the beach (sea level) and take your pump with you on a ski trip (high altitude), your entire body is in an environment of lower ambient pressure than it was at sea level, so one needs to be more cautious when pumping as the vacuum level you pump at plus the reduced ambient pressure from the altitude results in a situation where your penis is exposed to more delta P than it normally is. One could start with less vac level and monitor your penis’ response, checking for petechiae, edema and blisters, and increase vac level as warranted.

Expanding a little bit: As altitude increases, there are less air molecules which results in a reduced ambient pressure. This also means the greater the altitude, the harder it is to breathe, which may require a few days to get accustomed to and normal breathing be restored.

Well, maybe is just me not being familiar with the pumping equipment PE guys tipically use, specially gauges.

I’ve never pumped and only seen gauges with negative ranges (from 0 to -100 k Pa ie) when working with vacuum systems in the past, so my thoughts go into that direction.

The regulator I suggested is an example btw

One of the more common penis pump set ups is a cylinder/tube and a pistol type vacuum pump with vac gauge and hoses. This is popular as it is very cost effective and available in many places in the US and some of Europe.

For our purpose, vacuum can be defined as the reduction of pressure below ambient pressure. An unwritten assumption is everything takes place at sea level, which means ambient pressure equals 14.7 psia and the vacuum envelop is from 14.7 psia to 0 psia. As some 90% of the world lives below an altitude of 5000’, this is an acceptable working assumption.

Gauge pressure at ambient is 0 psig and as vacuum is below zero it is recorded as a negative value in scientific settings. We, the entire PE community, are very laisse-faire about using the correct terms and meaurement units when discussing penis pumps, aka vacuum erection (VE) devices. We often use “pressure” when the correct term is “vacuum” and seldom use negative when referencing vacuum pressure levels.

Short tangent here:
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Time has shown that sliding your dick into a plastic tube and pumping until the gauge reads “5” and maintaining that for some time period on some schedule for weeks/months/years is an effective method for increasing penis size. Needing to have a physics degree is unecessary for the activity, so we live with the relaxed environment.

However, when safety becomes and issue we do become more diligent in the discussion and explanations, which I see is the situation this thread is in for designing a pulse pump.

End tangent
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The common measurement units for vacuum systems in the US (SAE units) is inHg. Vacuum gauges typically register from 0 to -30 inHg. Gauges often have two measurement units on the dial. Mine has inHg and kpa. The metric equivalent to inHg is mmHg. You may occasionally see a vac gauge with units of atmospheres (Atm) or bars (bar). There are other pressure units that are very uncommonly used in the PE world, but occasionally surface when someone grabbed a vac gauge online, hardware store or other.

Note that: 14.7 psi = 29.92 inHg = 101 kpa = 763 mmHg = 1 atm = 1 bar.

"Imperial" pressure units are typically atmospheres, pounds per square inch, inches of water, or inches of mercury.

Metric pressure units are typically atmospheres, Torr, Barye, Pascals, bar, centimeters of water, or millimeters of mercury. (not counting older units in the cgs/mks metric system)

When I’m pumping I like to do 4 minutes at -5inhg then 1m at -10 before dropping back to -5 and repeating the pattern until 20 minutes is up
This pulsed pumping is faster and more extreme by the sounds of things.

I’ve been using a rig that I hacked together; it allows me to set any pressure (within the limits of my gear) for any duration and program it to run a pattern of combinations. I thought of it and wondered if it would work here. I’ve been using rather fine tubing which means the vacuum can only drop slowly (~2inhg/second), is that fast enough? I can use a bigger solenoid valve and tubing if I need to increase that rate

What is the ideal pulse… how much vacuum for what duration and is a drop in vacuum all the way to atmospheric pressure required or is there a small level of residual vacuum that would be considered ideal?