Recent content by blakej

I'm trying to get a rough idea of how flow rate through a round, sharp edged orifice is affected when a fluid is water/glycol versus pain water. In this circumstance, it's 30% water, 55% Dihydroxydiethyl Glycol and 15% Polyalkylene Glycol. I don't need exact numbers at this point, just a...

Very interesting thought. I'll explore that one. Thanks. Blake

I have an application which requires a high purity reciprocating seal at 3000psig. An AS 568 size -002 o-ring is the size I need or close to it (must work on an nominal ∅.046" shaft.) Teflon or FFKM (like Kalrez etc.) would be acceptable, but spring energized Teflon seals are tougher at that...

Hi all, I'm looking for suggestions on selecting an Aluminum grade which fits the following criteria-- -The cheaper the better! -Medium hard to very hard -Highly machinable (I'd like to see chips, not strings.) -Holds anodize well -Strength is not particularly important I have some ideas, but...

Thanks for the follow-up. I experimented with a very small funnel shaped extension on the end of the bubble test tubes with a small floating ball inside. When the vacuum inside the fixture starts to suck the water up the funnel, the floating ball floats up with the rising water level and plugs...

Assuming a big crunch theory were to be true (I know it's not too popular a theory these days) I figure a collapsing universe would need to have decreasing entropy. If entropy is decreasing, would the arrow of time flip? Also, because physics is just as valid with time moving backwards, would...

sounds similar to a theory I saw on some science show where the theorist was saying that gravity may be a different manifestation of the strong force with its force carrier being two gluons

Hey all, I built a fixture for leak testing cylinder valves. The potential leak points are tested using very small ID stainless steel tubing which drop into a small container of water or leak detector solution. We currently monitor for bubbles and will fail the valve at very low leak rates (a...

Thanks Baluncore, I'm going to use a face seal with an elastomer. It's a static seal for use with various inert gasses and no temperature extremes. If I bottom out metal to metal on the outside of the groove, I shouldn't have to worry about extrusion like I would if sealing in a bore w/o a...

Hi, I'm doing a design which requires a face seal with internal gas pressure of 3000 psig. An elastomer face seal at that pressure may run into some issues. The threaded connection between the parts that retain the seal is small and the female thread is alum which will strip under high...

Thanks for the suggestions Travis! I will check out those standards.

Hi, I'm looking for a standard (CGA, ANSI, ISI, etc.) which lays out requirements for the marking of pressure ratings on shut off valves (which aren't cylinder valves) in the USA. Does anyone know what it is or if it even exists? Any insights are much appreciated. Thanks! Blake J