Question Reducing IP on piston regulators

[Whitrzac]

Out of curiosity and with all due respect -- why go to these extraordinary lengths, whether by crippling regulators by shaving springs and / or removing shims; or by even the use of unbreathable gases, simply for drysuit use?

Aside from that initial seal at neck and wrists, prior to hitting the water, I seldom if ever added additional gas from my primary tank; it was typically one and done, and I was fully capable of using my unbalanced Cyklon 300, then set at 12 bar, for all of those needs.

In all the years of commercial and recreational diving with drysuits, I have never found it necessary to carry additional tanks for that particular purpose -- and while on a boat in the Great White North last year, found it oddly amusing at just how many of those overburdened weekend warriors, who already could scarcely stand on deck, also slung dedicated cylinders with that orange warm and fuzzy message "ARGON: THIS GAS WILL NOT SUPPORT LIFE."

I was beginning to feel underdressed . . .

Spoken like someone whos never dove trimix...

Even if they had argon stickers theres a 99% chance they were just running air in them anyway

 

[Bigbella]

Spoken like someone whos never dove trimix...

Even if they had argon stickers theres a 99% chance they were just running air in them anyway

I had used trimix for years, though generally not while using a drysuit; and no one on that aforementioned boat with the argon ponies was breathing anything but compressed air, from the onboard compressor.

Still, it does nothing to explain why anyone would purposely cripple a regulator and largely render it useless, for anything but drysuit inflation; and no one that I've ever known, to my knowledge, in the commercial trade, had ever sought to do that (and I had serviced enough of those regulators at the time but with never that request) . . .

 

[tongl]

I had used trimix for years, though generally not while using a drysuit; and no one on that aforementioned boat with the argon ponies was breathing anything but compressed air, from the onboard compressor.

Still, it does nothing to explain why anyone would purposely cripple a regulator and largely render it useless, for anything but drysuit inflation; and no one that I've ever known, to my knowledge, in the commercial trade, had ever sought to do that (and I had serviced enough of those regulators at the time but with never that request) . . .

Because my booster need to run below 8 bar, and it just happens I want to use my drysuit inflation reg to do that. Why? Because it also has a button spg, an opv, and a lpi, everything I need for drive gas as well, means I can travel with one less reg.
I just happen to have a few mk2 clones on hand, they are dirt cheap, I really don't care if will be destroyed.
Anyway piston reg just sounds like a nightmare to alter ip, so I bought another secondhand DS4 for that now, running happily at 7.5 bar.

 

[evandroairton]

AFAIK the mk2 has a spacer betwen the spring and body, by removing it turn the IP down (done it for a solenoid feed) by adding others brings it up
On older models it used to be a clean disk at the ambient chamber, on the evo is a blue piece of plastic withi the chamber

Regards