Regulator Venturi - Good or Bad? - Scuba Tech Tips: S06E15
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- čas přidán 20. 11. 2017
- A viewer asked if they need to purchase a second stage regulator with a venturi? Alec explains why regulators have a venturi, how it works and who would benefit from having it.
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When you mix ton of charisma with years of experience you get Alec! Best scuba gear videos out there by far. Keep on good work! V
Wow! Thanks Voj.
Alec
What a great video! As a beginner these videos have been extremely useful in making me understand the equipment, and making me a better diver in the process. Thank you for sharing!!!
As a “big” guy who has been diving for ever, this was very informational and helps make sense. Plus after watching your video on your training (I took my course in 1974!) I’ve decided to go back this Spring and take a refresher. Even though I’ve been rec diving for years, taking time off and coming back, it really made me think and decide, why not take a course and make sure I’m “up to date” with my training. Thanks for these great videos Alec!
I smart decision Paul. May of us stone age divers have lots of dives but the new gear and training keeps you current, safe and enjoying diving longer. Stay safe my friend.
Thank you Alec for all good advises..
Alec, thanks for another great video. Keep them coming........
Brilliant explanation, thank you! 👌
Beautifully explained! Thank you Alec !
Thanks for watching Aquanaut.
Take care.
Alec
Alec, your videos are a blessing! Thanks again.
Glad you like them!
A
Very informative! Always a little smarter after watching your videos. Keep them coming, Alec! Thank you..
Finally I get it!!! Thank you sooo much for sharing your knowledge with us!!
Glad to help. Scuba is simple but sometimes the explanations I hear make it complicated.
Alec
Thank you Alec! Love the real demo of venturi and now I understand.
Glad you liked it!
Another very helpful episode. Thanks Alec!
Thanks for watching Glenn.
Alec
Your videos and explanations are priceless. Thank You !
Glad you like them!
A
always great to watch
Glad you like these Paulo, I love doing them.
This has been one of the most interesting, educational videos I've seen. Thank you!
Well, thanks Matt.
I have found (over 2 million views) that each video has something for someone.
I'm glad you found something useful in this one.
Alec
Another great video. Thanks Alec.
Thanks for watching.
Alec
You are the king of scuba! thanks for all the content!
I appreciate that!
Awesome presentation! Tons of charisma as well as expertise!
Thanks so much!
That was an awesome explanation and show and tell
I'm glad it worked for you flyer.
Alec
Great explonation! Thank you Mr.Pierce!
You are welcome!
A
Thanks Alec. What you presented provide me with lots of useful information to better understand the workings of the regulator.
Welcome Ryan. Lots more for you to learn.
Thank you. I love this video. Great job in explaining...
Glad it was helpful Monica. Thanks for watching.
I can't remember how many of your videos I've seen so far and I learned a lot from you some things I didn't know, I've been certified since 1989, and I learned your never to old to pickup something new. Thank you for sharing your passion I also have for diving. 🇺🇲👌🏼
Great to hear Rocky. Vintage gear is great fun to collect and dive but for easy no fuss diving, I love the modern stuff on my old bones.
Thank you Sir....for another information packed video. Your delivery of the material and attention to details...make it a great way to learn. Please keep up the amazing work!
Much appreciated Michael and thanks for watching.
Great videos Alec! Thank you so much for your honest and sincere tech tips! Perfect! Wish you health and flexibility of your mind Thank you for sharing 60 years of experience this is priceless
Welcome Evgeny and thanks for watching.
Alec
Excellent information...love your videos...."your knowlege sails in a sea of experience...".😍😍😍
So nice of you. Appreciate it Miklu.
I learned one more feature of my regulator. Thank you for your lesson.
Glad it helped
Hello Alec.Thanks for explaining that in laymans term. Short and concise, straight to the point..
Thanks Chris. Hope it helps your understanding of your scuba gear.
Alec
This is wonderful, love your explanation.
Glad you enjoyed it!
A
I have found these videos so interesting. You go in great detail with all the gear and throw in some personal experiences while explaining which are very memorable and I can easily relate your suggestions to my own gear.
Thank you so much for doing this and sharing you broad knowledge on diving!
Well thank for watching.
I'm glad you're enjoying it. I enjoy making the videos or it that too obvious?
Almost every day someone asks why I don't make money on U-Tube.
My answer is simply - my viewers don't want ads and I don't want to spoil my fun.
Take care.
Alec
Very detailed tip!
Man, you cleared all my doubts like anything. Best video on how the regulator works. Thanks. ton.
You're welcome Deepak. Lots more to learn.
A
As always great informative video
Thanks Chevy.
Alec
Great explanation again! Every time I watch your videos, even on a subject I thought I knew, you show me something I never knew before. I love your presentation style too, simple and to the point without any flashy green screens or animations, just a man in his workshop showing us the ins and outs with practical demonstrations.
Thanks for your uploads, haven't found a single bad one yet!
-Rob
Keep watching Wij. I'm sure there's a bad one in there.
Let me know when you fid it.
Thanks for watching.
Alec
You nailed the explanation of what i had diving this holiday against current. Had the Mares rover from dive center, but against the medium current it was a hard work for me and didnt give enough air for me.
Awesome videos.keep them coming
Thanks Chris.
Alec
I’ve only just discovered you and your tech tips. You are a revelation! I love watching your videos, you explain things in a way anyone could understand and you clearly have a LOT of experience. You also make me laugh a lot. Keep up then good work, I’m telling all my dive buddies about you!
Thank you Paul.
Hope you find something useful.
Alec
Hey Alec! That s a great video again. Thanks very much!
Thanks for watching Lulu.
Is that really your name or your U-Tube name?
And are you small, as in Little LuLu?
Take care.
Alec
Hey Alec,Nico is my real name ;)
I love love that vid Alec, really great and made me to understand even more the benefits and how to not have a free flow too easily ;) ... I have that exact reg 1st and 2nd stage except mine if the 50th edition bronze ...
Yep. Good reg.
Alec
What a great video. Excellent explanation for a newby like me.
Glad you enjoyed it!
You're the BEST! Thanks again for a great video and explanations!
Houston TX
You are so welcome!
A
I love your channel. I'm getting back into diving after 23 years, since I was a teenager, and your channel has brought me up to date. Thx you and keep em coming....
That is awesome! Welcome back and hope my old man rants give you tips for buying gear and diving. Take care.
A
Just got a nice set of regs with these secondhand and had them overhauled. Thank you for making this.
Glad you like them!
A
Very helpful explanation - thanks!
I have listened to many scuba "experts" trying to explain some scuba gear principles and been confused. I hope my videos help.
Alec
Thanks a million, finally I get the idea.
You, sir, are a mentor to a student like me. Thank you and Kevin for the time spent making these videos. Your contributions to all things diving are immeasurable.
You are very welcome John.
absolutely a thrill to watch and learn about the Venturi lever, thank you so much! now i know why my regulator acts funny 😂
Regulators often act 'funny' but there's always a reason.
Thanks for watching.
Alec
Thanks for the class on venturi I just bought a Brawn 1st, 2nd and octopus and they both came with this feature know I understand it a little better
Glad I could help
Great tech tip-While watching I actually took my regulator apart and cleaned the diaphragm area. Will add to my maintenance agenda. Thanks, Jim
Thanks for watching Jim.
Glad it was helpful.
Alec
Greetings from Orlando Alec, glad to see another video! Hope you are doing well.
Thanks Scott.
Di and I are looking at getting a home in your area - around Little Canada in Kissimmee. Maybe we'll get together.
Take care.
Alec
That would be great!
Just excellent!
Much appreciate the feedback.
A
great explanation and most importantly, demonstration of the venturi effect in a 2nd stage. I came to this video trying to understand what a venturi caused free flow is and I learned so much more than that, including how a 2nd stage works. TNX !!!!
Glad you enjoyed it and are smarter for watching.
Thanks,
Alec, another great explanation. Your Tech Tips have saved me so much money, I was finally able to buy that ScubaPro G2. ;-) Well maybe not enough for the G2, but you have definitely decreased my annual expenditures significantly and increased the life and reliability of my gear. I really did get the G2 and love it, although I look a little odd diving with a G2 and twin steel 70s with a J-valve. Still looking for a twin hose regulator.
Alec
What an amazing video!! I bought a scuba pro MK25EVO and A700 reg a year ago and it has a Venturi on it. I found this Venturi useful on a dive on el um farod wreck in Malta, we were swimming back into quite a strong current and this Venturi helped a lot when I turned it on. I wasn't sure of the science behind it, I just knew it helped me. Now I know why!! Me and my 19 year old boy love your videos and think you're well cool, keep up the good work!!
Kind regards
Johnny Battiste
Thanks very much Johnny. I'm happy to be of some help on your diving.
Alec
Thanks a lot!
Very helpful. Keep it up
Thanks ALEC for your explanation.I am 54 years and kind of the guy you just described even with the same regulator!!!! It is a very good help for all divers.Keep following yor tech tips
AH. A young diver.
Glad to hear you're enjoying my tips.
Alec
Thanks for the up-date Alex , life saveing air is to precious to be Liberal with it.........
thanks for posting............................
Wow Alec, great presentation. Very illustrative, mostly for somebody that is restarting to dive after more than 30 years of not doing it and needs to know how the equipment works nowadays. Keep on with the good work.
Most things haven't changed - new materials and some new technology. But we still fin up and down - not sideways (except for the odd tech diver) and have the same old problems -fogging masks, dives are too short, etc.
Have fun.
Alec
Non-diver preparing to go into diving here. Absolutely love the explanation and humour in this video. I know understand how this works! Thanks
Glad it was helpful and know you will love the underwater world.
A
this has been the single most informative video I have ever seen, just watched it with my 12yr old boy who is doing his open water along with me, he now understands how the regulator works, what the parts are, and what a venturi does, brilliant video
Thanks Mark.
I'm glad it has helped you guys know what's going on.
Alec
Thank you, Alec. I’m a new diver researching for my first reg purchase. This video explains well the need or not for venturi.
Glad it was helpful!
Thank you. Much easy to understand.
Good.
My viewers are a mixed lot (in more ways than one). Some are new divers who just learned to pronounce regulator properly while others are very experienced divers with a lot of regulator experience including how to service them. I have to direct my videos at the common factor trying as much as possible to make them understandable without being too boring.
Glad you enjoyed it.
Alec
Love your videos
Thanks for watching Frank.
Alec
WOW you just explain this so great !!!
Your should be a teacher.. now i see and hear how this works PERFECT !!! THX !!!
I am! I am a teacher!
Thanks for watching. Glad you enjoyed it.
Alec
You have a great talent for explaining things in a simple and understandable way.
I'm very fit but you never know what condition you could run into under water that might exhaust you (like being chased by the Loch Ness Monster ..lol ) and having that venturi can save your life. Worth the extra bucks.
Thanks sir, glad you enjoy my ramblings.
Wow that was informative Thanks Alec .
Thanks again.
Alec
Oh I`ll be asking questions , I tried to get into diving as a younster , Till my brother sold a motorhome we got Ieft all my gear in the compartment I was so choked , But I ended up being a big guy in my 50`s now but losing LBs again I know of a buy and sell link the people sell diving equip Cheap enough , Obviously if you have a 50 dollar life buy 50 dollar gear , But they have some nice Regs. Guages. BCD . for 100 to 500 should I consider this --I know of ( Don`t buy 6351 tanks ) Any tips
Hi Alec, I just bought a new reg, a Scubapro MK11/C350. I just wanna say thank you, because I happen to watch this video just before my first dive with my new reg and could really understand about the venturi feature - and not panic when it easily freeflowed because I already know what made that happen - because of this video! Keep these useful videos coming!
Comments like yours are what make the work worthwhile. If I can help just one diver understand his gear better and maybe enjoy his dive more, I'm happy.
Thanks very much.
Alec
Wow, great explanation!!! Thnxs
Glad you enjoyed it!
Fantastic Video. Thanks for that :)
Thanks Easy.
Alec
Great video again :)
Thanks Igor.
Alec
a divemaster in my open water training didn't even know what the venturi was, thanks for the knowledge
Not surprising Flyer.
Dive Gear knowledge is minimal for instructor training.
Alec
That's it I want a hooker system too. Sounds way funner than scuba!
Once again, you bring us a fantastic video. You truly are an awesome educator and presenter. Thanks! By they way, how is that video on painting or refinishing aluminum tanks coming along... (hint hint) lol. You are doing a great job!
That it fantastic! Thank you.
Thank you too!
Excellent vid.
Thank you Shaul.
A.
Lol😅. Dont get water on my 1st stage... Wow!! What more can i ask . A Million thanks Alec!!
LOL.
That's "don't get water IN my 1st stage" Marvin.
It's OK to get water ON your 1st stage.
Good luck.
Alec
Alec, I have that reg. Mine on the venturi says surface or dive or something to that effect so I always thought it was just a free flow issue. It sounds like I am wrong from the video. Love the videos!
Some regs, Scubapro comes to mind, have a 'Pre-Dive and Dive' setting. Others might say 'Surface and Dive' or whatever.
Strictly speaking these are not Venturi settings but simply devices that attempt to eliminate the sudden FreeFlow from a second stage it it's dropped into the water or if the purge is pressed on the surface. In the case of Scubapro, it's just a small lever that keeps the diaphragm from being pushed inwards too far. Other regs use different methods but the intent is the same - on Pre-Dive you have less chance of a FreeFlow; on Dive you have the least breathing effort.
Just use it as suggested. Turn it to Dive after you enter the water.
Alec
Thank you for this tip
Thanks for watching.
Alec
Thank you for this info...
Glad it was helpful!
Great demo with taking the cap off the 2nd stage
Glad you like it.
A
Alec again thank you. A few years ago I bought a new reg set actually a ScubaPro set and spent a bit more than $800.00 on them. They have the venturi feature and until now I didn’t really understand the function. The only thing I knew is that the lever had to be off and then pushed forward when I was ready to start my descent. I thought that spending the extra money on the regs that the first and second stage where just better quality but now I understand that maybe I didn’t have to spend that kind of money to get a good reg set. Well too late for that now. I am totally satisfied with them and hopefully they will last me years to come. Keep up the great work with these videos as I am learning so much from them and I am becoming a well informed diver because of them. Hats off to you Alec and your no nonsense approach to things.
I'm glad I was able to enlighten you a bit Martial.
Don't be concerned about the few extra bucks to get a Venturi. It probably wasn't much and eventually, you may find it was a good investment. You have Scubapro regs so you'll have them for a long time. The day may come, with age or a perhaps certain dive situation, where you will be glad you have it.
Take care.
Alec Peirce Scuba your quick responses are also much appreciated Alec.
Thanks for another great episode. I know you have mentioned doing an episode or two on drysuits. Just wondering how that might be coming along. Thinking of taking that plunge soon and would love to hear your thoughts.
We should have that ready in January.
Alec
Hello Alec! Thank you so much for all your super informative videos. But this is one of my favorites! Wow, no one explains this as well as you do. This was a spectacular demonstration of the Venturi effect, which is basically the Bernounilli's principles of pressure differential in moving air ( the principle responsible for modern aviation). The rapid flow of air inside the diaphragm causing the pressure to drop significantly as compared to the pressure outside the diaphragm, and thus the diaphragm will continue to be "pushed" in as long as the flow is there. This principle applies to air flow within a narrow tube is called the Venturi effect allowing continuous air flow and thus helping the diver putting forth less effort on air-sucking. The manufactures called this Venturi-assisted, indirectly implying somehow they created this technology, but it is nothing more than the natural physics principle discovered by Giovanni Venturi in the 18th century. Closing the lever will partially close down the tube and slowing rate of air flow to the point the pressure in the chamber will rise enough together with the return force of the diaphragm back to its normally closed position, thus abolishing the Venturi effect. So the question is do we actually need this lever in the alternate second stage, commonly used only in an emergency? Probably not. Do we need the lever to prevent accidental free flow in the primary second stage when the purge button is struck, or when we need the Venturi effect to get more air with less effort? Probably. Your choice. It appears that the manufactures often charge hundred of dollars more to have this lever put in to their newest models, everything else being equal. Finally Alec, I am new to diving but watching your videos helped me learn a lot about this wonderful sports and save a ton of money at the same time, buy not purchasing unnecessary equipments!
Clearly your understanding of Bernoulli's Principle is solid and you're right. It's nothing new.
Re the design of regs, I agree that the venturi is NOT necessary in a safe second. In fact, it may cause more problems than any advantage offered.
I don't mind it in the primary provided it can be adjusted to minimal effect if wanted. When the diver needs some assist, he just dials it in.
DACOR (and maybe others) had a neat venturi system in which the lever had a vane on one side that directed the air across the diaphragm but only when the lever was depressed a lot. That is, with a normal shallow breath, there was no venturi effect but if you drew a big breath, as when you needed more air, the vane on the lever was drawn into the air stream and directed the air across the diaphragm to create a venturi effect. Essentially you automatically got a venturi asist when your needed it - automatically.
Glad you've been enjoying the vids.
Take care.
Alec
Hi Alec, Love your videos. I recently got recertified and have been watching you tech tips on what a person really needs. My son and daughter wanted to get me a regulator first and second stage for Christmas which they did. MK 25 Evo with a A700 reg. I told them it was way to much and over the top, but they insisted. I now need a safe second and would really value your thoughts on what to get. I am from the PNW and cold water dive, but will travel to Florida and Hawaii in the future. Thanks again.Scuba Pete
You can get a good octo from Scubapro if you like but I'm a fan of the specific safe second designs. Oceanic has one and Sherwood too. They are a lot less expensive, work as well if not better and are much easier to deploy in an emergency. Check out the AltAir from XS Scuba. It's my favorite. I guessed that PNW means Pacific North West right? That means I live in the GLCO (Great Lakes Central Ontario) ha ha.
Good luck.
Alec
I would love if you would talk about different types of full face masks and the pros and cons of using them!! I love the videos and I'm an avid watcher, keep it up!
I'm working on that.
Alec
Great video my friend. Pushing forward with my training to become an instructor. Bye spring I hope. Suggest a video: Are LED lights better than the old bulb type. And service your light. Maybe a video on transporting your tanks.
LED vs incandecent bulb - not even close. MUCH brighter and uses so much less power so smaller overall package, or longer life) and they don't burn out/break filament. He did a video (very useful) on why you want to remove your batteries between dives for storage. I ruined one cheap light not doing it. I remove them after each wkd dive now.
Thank you!
You're welcome! Alec
Great Video as usual. What you did not say in direct words (as you were talking to novices) was 'ease of breathing' although you certainly discussed it. In one article a tech diver said was that you can literally just take 3 breaths a minute (at rest) underwater. He was right. (7 second inhale, 7 second hold, 7 second exhale). I cannot do that on land! I attribute that to the light weightiness feeling in water and the EASE of breathing from the Venturi regulator. I have show students the difference in feel too, as you were showing on video with good, well maintained regulators vs some of the horrible ones I have seen used for pool use (and as rentals!). I do consciously try to do slow deep relaxed breaths while diving. As a result I have great deal more air than most of the group coming back. A venturi certainly helps. Full disclosure- I am a big guy and usually dive sidemount or with other gear/cameras- so more drag than most.
My test subject is always Kevin. He is a tiny diver just like a blue whale. He loves the venturi effect for his big lungs and slow breathing can make air last a long time.
Great video Alec! Thanks!
Able to do a video about water resistance testing on dive computers and how they test it in pressure chambers?
Few dive shops can do a pressure test. The test chambers are very expensive - $2000+. There's no way divers will pay enough to warrant having one. And you cannot test the computer functions, only the watertightness and even that's iffy.
If you've just installed a new battery and O-Ring and want to test it, the only way to know if it's watertight is to take it down in the test chamber while in water (easy to do) and then open it afterwards. If it's dry it's good; if it's wet it's ruined. And if it is dry, then you have to reseal it and repeat the above.
See? It's not as definitive as you might think.
The test chamber will check the depth and time readings. That's about it.
Any other dive computer problems can only be addressed by the manufacturer.
Alec
Very helpful
Glad it helped Sarah.
Nice video 😊
Thanks for watching.
Alec
Nice to read ur replies
Thanks for watching Caetano.
Alec
Great feature it’s like having park assistant on your car.
Welcome D.A.
A
Greetings from South Africa, Been scuba diver since 1986. Great and informative videos. Keep up the good work. Am of the opinion that most of these "features" are gimmicks and the average diver does not really derive a whole lot of benefit from the apart from a lighter wallet ;)
Hello Marcel. Did you see my videos from South Africa? Starting at S06E17. Had a great time diving and safari.
Great informative videos and so well presented. Experience is priceless and thank you for sharing it. Like so many activities it does seem to me that buying the best you can afford is the only option, whether it's 2nd stage valves, face masks, BCDs and so on. Is there a range of equipment that competes with the very best in terms of functionality and performance without the flashy bits and what equipment do you use? Thanks again.
Alex
Great job on explaining how the Venturi does and how it helps out at diver. Keep the video's coming I miss not seeing one a week from you about fixing them. We live down in FL and started diving over five years ago in upstate NY. Diving in Lake George very cold around this time of the year. I'm glad we live in FL now on the west coast side.
Can you tell what a PADI or if NAUI tec course on maintaining your equipment goes through and is it worth it?
Thanks
Will
Diana and I are looking at getting a home in west Florida - in Little Canada close to Kissimmee.
The Equipment course is always a good idea. It mainly shows you how to take care of your gear so it lasts a long time. That alone is valuable besides the technical information you pick up about operation.
Take care.
Alec
Excellent video Alec. One question, since you have shown us the way the assist functions, would you be willing to explain how/what is happening in the regulator when a diver uses the breathing adjustment knob as featured on your example regulator in this video? Best.
I can do that. Added to the list. Keep watching. It may be a while.
Thanks. Alec
Hi Alex. Thanks for the vid. Excellent, as always. Was wondering if you do a comparison between PADI & NAUI dive courses. It's been 30 years since I last went diving & I'd love to get back into it. We are in northern Australia. Cheers.
I don't really want to get into an agency debate Ed. I'm an instructor for 7 different scuba training agencies and have friends in all of them. I think they all feel they are doing a good job.
I will say this - PADI is larger is numbers and worldwide recognition than all the others combined! So it makes sense if you want to get back into the sport (or if you're just starting) to choose PADI. The knowledge and skills are the same for all of them but the training materials and methods and the universal recognition of PADI makes it the logical choice.
NAUI was big in Oz as it was in Canada but they have simply not kept up with the times.
Good luck. Keep in touch.
Alec
That i had to exp myself when got my A700 and had to do clearing on my mask😂 air won't wanna come out to my nose. You'll get used to🤔 had to adjust. Works great at depth, easy to breathe if got air yo spare.
Practice and experience is not the best way to become a good diver - it's the ONLY way!
Good luck.
Alec
Thanks, Alec! It explained perfectly what happened to my regulator! So if I dive with max on my Venturi, does that mean I am consuming more airs and will likely run out of air faster?
Using a venturi assist does not use more air but makes inhaling easier with less work so your more relaxed while diving. Thanks for watching.
The most different second stages I know of are those by Poseidon. They're much smaller than most second stages, and the purge button is on the opposite end to the hose, rather than in front of the mouth. I know people who swear by them though.
Everyone has a favourite they love. That's why we have so many choices in gear, lucky us.
A