I just think the HEV is cool...

[omx5o]

Originally Posted by padi56

But do you know what the HEV does,? or will you ever use it in the environment it was made for.

Nobody goes to the moon these days, but they still buy moon watches.

[ma2045]

Originally Posted by RJRJRJ

https://www.youtube.com/watch?v=SPvtXaI7dYQ

Thanks very much. I've only ever found model cutaways or diagrams on the operation. But the video was more illuminating. Looks like it doesn't even protrude a half mil.

[Andad]

Originally Posted by padi56

Agree most dive watches bought today will never see water other perhaps a shower or dip in the pool, and the max depth ratings on many of these watches will never be used by man or superman in water.The HEV is just a one way valve fully automatic on all the Rolex dive range it's only used for saturation divers who work underwater and reside at depth in dry chambers at the same outside water pressure.The gas they breath mainly now a high helium content the gas particles are that small they can pass thought the watch crystal seals etc.And when the divers are being re-compressed to normal atmosphere pressure, any gas thats in the watches escapes through the HEV valve. Otherwise the gas would expand with the rise to normal atmospheric pressure, and the weakest point the crystal would most probably explode.A normal scuba diver would have no need to use the HEV on any watch.Think of it this way take a balloon down to 10m under water. That's 2 atmospheres one water pressure one surface air pressure.Now fill that balloon with air at that pressure of 2 atmospheres.Now because the compressed air is now under-pressure and quite dense. You can fill it but the amount of air breathing gas content would be twice as much as normal above water on the surface.Now release that balloon and let it go back to the surface because of the return to one atmosphere surface pressure balloon would expand and burst simply because there was twice as much air in it at surface pressure.

But at what internal pressure does HEV valve open?

Eddie.

[padi56]

Originally Posted by Andad

But at what internal pressure does HEV valve open?

Eddie.

If any gas is inside the watch the valve would start to open as the watch returns to normal surface air pressure in the dive chamber.

[Andad]

There must be a specific pressure inside the watch before the valve opens based on the HEV design?
1 Bar - 2.5 Bar - 3 Bar?

Perhaps Bas could chip in?

[angelfox]

Originally Posted by Ketler

Attachment 1154338

Amazing close-up photo

[1William]

It works with the watch.

[padi56]

Originally Posted by Andad

There must be a specific pressure inside the watch before the valve opens based on the HEV design?
1 Bar - 2.5 Bar - 3 Bar?

Perhaps Bas could chip in?

It would be a slow process just like the divers lungs being returned to normal atmospheric pressure in the pressure chamber.I would suppose it works the same way, and no 100% pressure bar when it opens, only the fact it opens slowly as pressure is released when returning to surface air pressure.

[garyk]

Originally Posted by omx5o

Nobody goes to the moon these days, but they still buy moon watches.

Such a good point! I was fortunate to be wearing my Omega moon watch one night while dining five feet away from Neil Armstrong. A short conversation ensued and Neil took my watch for a moment to inspect it. Possibly in the top five moments of my life!

[omx5o]

Originally Posted by garyk

Such a good point! I was fortunate to be wearing my Omega moon watch one night while dining five feet away from Neil Armstrong. A short conversation ensued and Neil took my watch for a moment to inspect it. Possibly in the top five moments of my life!

Wonderful. I would treasure that moment more than the watch.

[Ranger67]

Originally Posted by garyk

Such a good point! I was fortunate to be wearing my Omega moon watch one night while dining five feet away from Neil Armstrong. A short conversation ensued and Neil took my watch for a moment to inspect it. Possibly in the top five moments of my life!

Surreal moment.

[garyk]

Originally Posted by omx5o

Wonderful. I would treasure that moment more than the watch.

Exactly, I was never going to the moon but lucky thing back in the 90s I acquired that watch.

[Hiflyin20]

I have the SD43 and love it. No I don’t use it for what it was designed. But then how many people use the Daytona to time laps or the YMII for a regatta timer? These watches are so overbuilt that people just appreciate the engineering that goes into them.

[Polarexplorerii]

cool pic

[ma2045]

It opens at 2.5 bar

[Seddyspaghetti]

I think it is cool as well

[tgyberg]

Originally Posted by omx5o

Nobody goes to the moon these days, but they still buy moon watches.

I'm scheduled to go Friday