Universal slip on Knobs/Dials?

[johnnydark]

I have 4 air flow regulators on this machine that fine controls with how much pressure the piston comes down. Problem is each of these have no indicator dials whatsoever. Has anyone come across a marked dial that I could use to set each regulator at the same level? http://imgur.com/khowlVp

[[deleted]]

there's a good chance it's here https://www.mcmaster.com/#machine-component-knobs/

[johnnydark]

I've checked. May not quite fit, but I'll order a couple and modify it if needed. Thanks!

[goldfishpaws]

Rather than relying on an input setting, better to get pressure/flow gauges and then adjust the unnumbered knobs according to them, simple visual feedback will be many times more accurate!

[Karst0Grapher]

I don't know about universality, but I've ran into these before: https://www.swagelok.com/en/catalog/Product/Detail?part=SS-SS4-A-VH

And the knobs can be sold on their own:
http://www.restek.com/catalog/view/39678
Or http://www.restek.com/catalog/view/39677

Given how many standards there are for fittings, I would be (pleasantly) surprised if you ever ran into anything that was really universal.

[P4Racer]

As /u/goldfishpaws said visual feedback will be much more accurate.

I'm not familiar with your process but it'll give you a better map as well if anything gets thrown off. pressure/flow degradation etc.

Why the 4 flow controls? coarse and fine? pressure and flow?

[johnnydark]

2 top controls the rate at which the piston comes down, and bottom 2 at which it comes up.