Very cool tool - HVAC schrader core changer
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- เผยแพร่เมื่อ 30 ก.ย. 2024
- You may get Deja-vu from this video, as it's the full length (and horizontal) version of an earlier short.
Because China has a huge infrastructure, there are some very cool tools available cheaply from online sites like eBay. This is one of them.
It's a schrader valve core changer, but is designed to change the cores under pressure/vacuum in active refrigeration and air conditioning systems. Note that this tool is not intended for changing schrader inserts on car tyres/tires. I'm not sure what size of port they use. This tool accommodates 1/4" and 5/16" valves.
The extra side port is for extra functionality, including pulling vacuum or injecting refrigerant with the core removed for speed.
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/ bigclive
#ElectronicsCreators
That's brilliant! I have no use for it at the moment, but I feel I need one.
You stole my comment! The need/want conundrum is a technical concept, difficult to explain to Mrs Banana, I then point to her stash of shoes.
Same here😊
Yes same here
Yes, a must have! Better to have it and not need it. Than need it and not have it, kind of thing.
The fact is if you don't buy it you'll inevitably later discover that you need one.
You are correct, the side port is used to connect a hose, Typically if you are pulling a vacuum you will remove the schrader valve(restriction) to speed the process up.
The other use is to purge the tool of air, with refrigerant from the system.
You don't want any air from opening the tool to swap the valve to get into the system. Air is a non-condensible and moisture in the air will cause ice particles that can block the tiny restrictions leading into the evaporator.
Could also be used to recover refrigerant if something goes pear-shaped while swapping the core... Like if it cross threads, or if it falls out of the holder. Probably to pull a vac in the tool though, to prevent contamination.
It can also be used to attach probes as well as hoses.
Pulling a vacuum would be blocked by the one-way valve when present. But attaching any toolB that needs access to the pressure system makes sense even with keeping and reinserting the original valve, as this toolA will only leak just enough gas to fill the toolA internals as it unplugs the valve and closes up, forming a closed chamber connecting the installed system and toolB.
The CorePickingLawyer 😉
The SchräderPickingScotsman
One week before seeing the short version of this I found a leak in my car’s AC at a Schrader valve. I was wondering how I could replace it. Saw the video, bought the tool, changed the valve and topped up the freon. AC blowing cold again! Thanks!
The side port has a Schrader valve so what’s the point of removing one only to leave one in as a restriction. I remove the end after closing the valve and evacuate/charge the system directly. The side valve can be used for checking for pressure but best for fitting a vacuum gauge
Super cool to see how these actually work. I've seen Chris over at HVACR Videos use one of these many times and while I understood the concept of the device I was never quite sure how the isolation worked once the core was removed but before the ball valve was closed.
As for the port on the top, while I'm not certain if this is what it's intended for, it can be used to speed up recovery and charging of a system since you can tap onto it while the core is removed thereby reducing the restriction caused by said core.
I was just making a similar comment, they both do such good work, no?
Same here! Seen it used a number of times.. Its magic isn't it?!
Man, do I love specialized tools that solve incredibly specific problems, but do so in an equally incredibly creative way.... Thanks for sharing!
I don't even do HVAC and it is one of my fav tools. It's one of those tools when you learn about it you are like "HOW DOES EVERYONE NOT KNOW ABOUT THIS!?!".
Clive, the side valve is to safely depressure the core changer prior to removing it as it would have pressured up to system pressure during the core change. This type of manifold is quite common in the refinery industry. But in that environment, the pressures, temperatures, and the size of the manifold are tad bit larger.
All the Best, Chuck
It's also to allow evacuation of the line set without the shrader installed for faster vacuum.
That's actually an unintended benefit of its real use, to pull a vacuum, as Nick said.
"Tad bit bigger" LOL, everything is relative! HAHA
Hey!!!! I own a hvac company that specializes in ductless mini splits and use one like that every day
You didn't mention it, but the backside of the valve cap is also a valve removal tool.
can you pinpoint the time in the video where that is visible ?
@@jyvben1520 From about 1:30 until the end of the video. Sitting on the table, cap end up.
@@NusaCat thanks for the info, sadly not really moved so impossible to see how it would work.
These were like $500 when they were new and under patent. I bought mine when I first saw it for
In a pro situation I'd be using pro components. It's cheaper in the long run.
Somewhere I have an AMP D-Sub connector pin inserter/remover tool that was given to me by a guy who worked in telecommunications when D-sub connectors were new. Told me it cost over $200 and his boss would have a shitfit when anyone lost one. At the time he gave it to me, AMP was selling the exact same tool for $5 or less.
@@bigclivedotcom
Hi Clive.
There spamers in the comments.
I have reported meny of them.
But maby it easyer for you to clean them out.
Thanks for a grate channel.
😎👍
@@janne65olsson I've blocked one and tried to implement a new filter.
Can't comment on the use of silicone lubricant in refrigeration lines but any grease in, or near, an oxygen line is a no-no. It's possible for a leaking oxygen line / valve to cause the grease that a worker can get on their overalls to combust.
The side port is because it is a pain to vacuum or pressurize a system with the valve in. So you can connect your vacuum pull the core and pump the system down in 20 min vs hours if it is installed.
That’s fantastic. I’ve never had to replace a schrader valve at work or on any car, but I’m glad there is an easy means to do so.
This is mostly used in domestic hvac. And not neciasarily for changing the core just removing and replacing it during service work.
Refco make a far superior model. Same theory but better build quality. The 1/4” access on the side is for pressure reference if pumping down a system or if no other access points at evaporator it can be used for vacustat.
Great explanation!
I did 12months of trade teaching and you explained this much more efficiently then I ever did and this is part of my trade haha
Clive.
Thank you for your help via email, it's really helped me.
Today I woke up and got some jobs done, I have a good meal and visited my old support worker in her new workplace.
I've got past the first day, next will be the first week.
It's still hurts inside but I can cope with the pain.
Thank you for being awesome. ❤️🙂👍
Glad things are looking up. It will take a while to get back to normal, but each day will be easier.
There is something similar for a SCUBA regulator. It is an inline adjuster for the 2nd stage orifice. You thread the tool between the 2nd stage and hose and you can adjust the orifice under pressure. You can't remove or replace the orifice though.
That is ingenious! Learned something useful today, hopefully will never need to use it.
love to see trade tools shown off, this is my favorite tool for pulling a vac down when doing a resi install. compared to leaving a schrader in i can pull down to 150 microns in 15 minutes compared to 20-30.
I've used one of those a lot.
The port is for your charging guage set.
The Schrader valve is a significant flow restriction and it's removal makes charging much faster.
Nice Clive!
I use the Appion 1/4 and 5/16 units……even nicer “ kit”😎
So weird seeing these on here having used them so frequently at work haha, glad someone else finds them interesting!
Similar devices are used for adding branches to pipelines operating and under pressure. Called hot tapping, it often involves welding..exciting? It gets better. Also done on natural gas collection and distribution lines. And hot repairs, where the leaking gas is often ignited on purpose. A pipe saddle installed in half sections is fully welded over corrosion holes.
Schrader valves are used in car AC systems and tend to become leaky over time, the system has to evacuated to change them, I imagine that this is tool is intended for changing those without the need to evacuate and refill.
Sadly this tool is too small for those valves - they are bigger and there is two sizes. And not all systems use the same valves / couplers just to make it extra fun.
@@zaprodk Shame, pre-emptively changing them before they leak would've been nice.
That's a super clever doohickey
This would be good for working on my bus's ac units. Thanks, Clive.
This is exactly the kind of amazing purpose-built tool you get when the people doing the work actually design them.
I found some instructions for a very similar tool on TH-cam (E5G0ehjlHHE). It turns out the side port is there to connect a gauge, then you can evacuate/refill the system through the end of the tool, close off the ball valve, and swap in the new stem. Such an elegant little combination of manifold, valve, and access port, all in one tool.
Once you remove the valve, you have the full pressure on the refrigerant behind it, so placing the new valve takes a bit of effort. Fortunately, this is a very infrequently needed tool. Usually, it's the fault of a heavy handed torch user, not protecting the valve from heat, that causes the valve to fail. They are capped except for service, so dirt should never be an issue.
Not removing the valve core before brazing is unthinkable! 😏
@@markhonea2461 😆 We've ALL done it....
@@davelowets yeah. Yep. Sure have. 👍
"How 'bout it , Hank? Should I let you go?"
"My name is HVAC Schrader"
Came here for this exactly! I knew somebody would've made this joke.
@@static_motion Same.
This is basically a tiny version of how we make taps on water mains live. How we can drill, tap and install threaded valves. I agree very cool tool. Thanks, now I want one for demonstrating
They are currently replacing the gas main at the end of my street and will do so without interrupting the supply, I imagine they will use a similar device.
@@chrishartley1210 the non sparking version i hope ...
@@jyvben1520 I'm not fully sure, but I think sparks wouldn't actually do any harm on gas line as I think it's way "oversaturated" in lines to create any kind of explosion. Things would change if oxygen/air is allowed in the party though 🤔
Sliced bread doesn't even come close to how useful these tools are :) I started using this tool in the 80's for refrigeration. I've also used these for installing and removing liquid tire ballast (weighted fluid) in heavy equipment and farm machinery. The side port is your system access service port (fluids and gases in or out).
I have six they are great the second port is for a vacuum pump line we pull the Schroeder valve out to evacuate the system
There are two thing, one the extra fitting they sent you probably is for 5/16 which typically is on ductless split systems so you can just use regular non 410a hoses. Secondly the best function of this tool as some already stated is removing the s header and using the side port to speed up charging or evacuation.
We use this tool not only for core removal but it also helps in large refrigerant charge/discharging as removes the restrictions you can then use that side port to move refrigerant in liquid form rather gas
Getting a serious sense of Deja Vu watching this video...
We have a very similar very old very name branded version of this for automotive AC systems, we rarely use it but it is neat to have! It's like an airlock for AC systems!
Lemme guess.... "Snap-On", and it prolly costs $350.
I'm not saying don't buy Snap-On tools, as I own many of them, but for a tool that I'll use twice in a decade, the one in the video will do just fine... 👌
@@davelowets Not sure, might be Mac or a boutique brand but it's got fittings for R12 if that tells you how old it is!
@@huzudra Probably 1995 or earlier..
@@davelowets Very likely, it hangs out in the cabinet below the R12 machine. I'm sure at the time whomever made it had a lock on the design and were the only ones making or licensing it's sale through other vendors.
Clive, you can also use PAG oil from the system you are working on.
Depending on the materials the o rings are made of, would a fluorocarbon lubricant/sealant compound be more appropriate? Silicones can outgas stuff that doesn't play well when compressed. (That's residual shop lore from long ago that may no longer apply.)
Yes silicon will off gas seemingly forever, even the smallest amount. Directly proportional to the pressure differential. Probably wouldn't hurt anything. Unless you are manufacturing silicon wafers or some such critical component.
I also commented this.
Shold have read the comments before i were writing. 😎👍
@@janne65olsson Uh... I wrote that without looking too so don't feel bad.
Was expecting you to say "this is the tool I made with BosnianBill" 🤣
Cool tool indeed. ✌♥️🇬🇧
huh, really cool. Like you I feel I want one, although I cant imagine me ever needing it.
I like to crack the valve before I completely screw on the top to remove the air.
Holy hell that's smart
Ima actually buy one so i can replace them when i need it myself
I have never touched any kind of refrigerant system and I most likely never will and I only have a theoretical understanding of them but this is a really cool tool, both in aesthetics and in function. Thank you for showing it.
We have things like that over here in Germany to change heating radiator valves under pressure. So you dont need to drain the heating system. It is called "Schleuse"... sluice...
Same thing, but a bit bigger.
Yep - search for "Ventilschleuse" and you'll find a number of videos showing these things being used... Someone had to do this for our bedroom several years ago after the valve failed. Sleeping in a 34°C room is really not recommended...
yes, bought one of these, worked perfectly...
No Link to the tool? 😕
I dont think i would need it, but i still want one! 😍
I use these to evacuate systems quickly and to manage fill rate and add my Bluetooth psi sensors. Super handy time saver
Those bluetooth sensors are great.
I use these almost every day. If you are filling a system the core can freeze and never seal up again apart from the restriction it causes both when evacuating and filling. I use the side port to fit a vacuum gauge that needs to be removed before filling, because any pressure will ruin them.
If there was a vacuum behind the Schrader valve, it would instantly pull in ambient air. Unless the valve is backwards.
Cool little tool. If someone were concerned about using silicone, they could easily use a drop of PAG oil, instead. It's available in any auto parts store.
Those tools are generally used for evacuation of a system and removal of the Schrader greatly speeds up the process. Removal and replacement of the Schrader under pressure is doable but very difficult due to the force required to ensure the core is installed correctly. Not an issue under vacuum however. The side port is for gauges or hoses
What's up with the date on the video ?? I thought I was going crazy because I remember seeing this video weeks ago ... but it says it was posted just now hahaha. Thankfully the comments are still old enough to regain my sanity
This is the non-short version.
So you shouldnt use silicone lube on stiff shafts?
These have been around for years. I had an extra one and gave it to my mechanic, he had never seen one. Very handy to have.
It is always gratifying to play with a cool tool! ;)
Thanks for putting this version up - I don't watch shorts.
NB. You wouldn't ever use a Schrader valve to hold a vacuum. They're basically a one way valve which will let gas in but not out. Kinda the total opposite of what you'd want in order to hold a vacuum.
HVAC techs use these to pull and hold a vacuum with the Schrader cores removed because it's faster.
HVAC is a matter of life and death.
Appion by far makes the the best one.
Yellow jacket used to make a thermometer that could be used for direct refrigerant temps although it's useless for obvious reasons.
If your core does not come out it's because your seal is compressed and is decreasing the diameter inside. Just loosen it a little on the access fitting and try again.
Instead of silicone we will use vacuum pump oil or mineral oil.
Have you tried Nylog? Handy stuff, nice and thick
On to it
What you have there is a great idea if it was produced by a manufacture that had the correct tolerances and a quality assurance standard. Otherwise, it is just a good paper weight / conversation piece. I know because I purchased one that was labeled (exact fit for my vehicle) yet it came with extra an extra rod for the just in case one doesn't fit.
Good idea but at $25 bucks you get what you pay for. A China paper weight.
Now go make a live video using this amazing paper weight that you have just indorsed as it was intended on a pressurized AC system. Good luck.
I'll agree that Chia has produced some good parts and tools for cheap.
THIS is not one of them. Although I'm sure that a very small percentage do actually work ok once or twice. The one I purchased didn't even come close.
Sigh, most of these Chinese made ones are horrible quality. I've had 3 out of 3 leak on a weld , or just won't hold a vacuum.
I learned about these while learning air conditioning in community college in 1989, it was called a "Schrader evader" back then.
I once watched a contractor "hot tap" a 12" high pressure gas line with a similar outfit. They welded a plate with a threaded nipple to the pipeline while fully pressured and gas flowing. They then screwed a valve to the nipple and then a device to drill a hole in the pipe through the ball valve. They drill the slug from the pipeline with a magnetic hole saw about 3" round and extract the slug a drill shavings through to valve they just installed. Then they connect the new pipeline to the system. Scary watching them welding a big metal plate to fully pressured pipe filled with methane.
"Hot tapping" with that tool to siphon off illicit gas and sell it. Not really a thing in developed nations. We send camera pigs through the lines that would see it.
Even scarier these days, considering the pipes are made of plastic.😳
How do they do it safely?
@@mrtechie6810 The methane inside will not burn without air so as long as they don't go through the pipe there's no danger. The old pipes were probably made of cast iron, newer ones from steel, and were quite thick. The welder would not have enough power to burn through.
Even with a leak (such as a cracked pipe) all they do is set fire to the escaping gas. I believe they then repair it with a similar technique, the gas to the flame passing through the valve which can then be closed to finish the repair.
Great to have for automotive use so you don't loose all the air in a tire because of a leaky valve
If you ever watch a new tyre being filled you will see that they don't put the valve in until afterwards, they only lose a very small amount of air. Changing the valve only takes seconds, it wouldn't be worth the effort of fitting the tool. Unless you've been conned into having your tyres filled with very expensive nitrogen.
Very cool. I will be adding this to my shopping list! 😁👍
this device has saved me many hours and headaches. i use the yellow jacket ones. one in the tool bag and two in the speed-evac kit. the side port is typically used for a micron gauge while pulling a vacuum. I also have an automotive version of this with the adapters for various different ports. Highly recommended
Holeeeee crap, that is EXACTLY the sort of tool I could have used a good while back!! I needed a way to evacuate and seal off a Bourdon tube assembly (long story), but make it reusable (otherwise I would have pinched off the tube). Ended up making basically this tool that could seal on to a little connector on the Bourdon tube. Zero need for one now, but I've gone and ordered one of these anyway just to remind me!
I started out nearly 50 years as a time served capstan setter operator and set lathes up for mainly females to operate them as many years passed I was went on to NC lathes and maybe the first of many to be involved in CNC lathes, the concept was staggering, but now I see turned and milled parts like this are just on another level. I don't vape but often find then in the gutter and with hand protection, I take them apart to just look at the level of accuracy on the tiny parts, with threads, dovetail grooves, holes of the size I just cannot believe and the goal post just gets smaller and smaller. I suggest with gloves and pick up one of these components off the pavement and take it to bits It's just bloody insane ... Martin Green
Under pressure!
Mm-ba-ba-beh, mm-ba-ba-beh
Dee-day-da, ee-day-da
Pressure pushin' down on me
Pressin' down on you, no man ask for
Under pressure that brings a building down
Splits a family in two, puts people on streets!
Err .....changing valve...one assumes a faulty valve...how much gas would be still in system?
Beyond that ...neat!
Use them almost daily.
Rainman ray needs one haha
Ohh that's cool. Saw the thumbnail and thought "Oh can you swap the core under pressure?"
Kinda related, ARB (and I’m sure others) makes a similar tool for airing down tires faster (for Jeeps, 4x4s, etc). Pretty slick, once you figure out how to use it properly.
Also, am I the only person that saw the thumbnail of this video and thought you were using a yellow "-" in the same font from just above, just to block out something from view? Turns out it was just the valve handle. Lol
3:13 that additional Schrader(?) port, I guess, is for a pressure/vacuum gauge as well as for refilling/extracting the refrigerant "in-situ" if necessary along with a valve core replacement. Some videos on "Rainman Ray's Repairs" 's channel feature leakage checking, recovering/refilling the refrigerant and clearing compromised refrigerant loops on cars. Very interesting, insightful processes & footage, although I don't like the person much. I can imagine that there could be a situation where valve core access and a High/Low Side connection or P/V gauge migh be useful to have at the same time. Maybe a damaged or stuck-in-closed-position core, but you *have to* know how much is in there?
I can hear now "Oh, do pay attention, Bond"..... It has all the hallmarks of a spy gadget.
"Miss Moneypenny, has 'M' authorised that new valve swapping gadget yet, or are we still stuck with the old PPK model that jams under pressure?"
Oh yeah. Those ARE the groovy tool.
While evacuating a refrigeration system, meaning mechanically extracting EVERYTHING from the system, say after a repair to the system, just prior to recharging the system with refrigerant. Getting absolutely EVERYTHING out of the evacuated system, including air molecules, and especially water molecules, is kind of tricky.
So, if the system is ready to evacuate, likely what is in their is a pressure test charge of dry nitrogen, let's say, 150 lbs psi that you would use to insure there isn't any leaks. It is important, but doesn't have to be very hi tech, and spraying water mixed with any foaming agent for example dishwashing detergent around any suspected areas and looking for telltale bubbles. Ok no leaks, so open it up and the pressure exits the system down toatmospheric pressure. Then attach your mechanical vacuum pump and draw out EVERYTHING. Like, it should be the same(or better) as stepping outside the international space station, while in orbit.
The thing is, molecules are basically like anything else. They drift around and drift around Willy nilly until they bounce into something, then change direction. If there is little to come into contact with, there isn't any real reason for them to move at all. But they do seem to have a certain perpetual kinetic energy that prevents them from not traveling to and fro as they do, until contacting anything in their path. So somewhere in the environment they reside a vacuum pump is collecting molecules just like them and forcing those molecules to bounce right out of system and into the atmosphere. The mechanical vacuum pump doesn't reach in further than itself and latch onto molecules, no, after a point, it is simply a waiting game. The molecules of perhaps nitrogen that were left behind during the mass exodus of their brothers are basically lost, and alone. And they could actually be 50 feet away from the vacuum pump. Drifting merrily along and bouncing AWAY from the last thing they may have brushed up against. By chance, or statistically, the molecules closest to the vacuum pump have the highest chance of drifting into the throat of the vacuum pump, but they will only enter that chamber and be expelled after bouncing down a long (relatively) narrow tube, with nothing actually pushing it along, and randomly aiming it's path so that nothing is going to make it bounce off course. Just traveling by its own volition through the narrow metal tube is, when you think about it, more UNLIKELY than likely. So, you want to make the path in front of the molecule as clear and without obstructions as you possibly can, so the dam molecule doesn't get only inches away from leaving only to bounce directly backwards after coming into contact with some part of the tiny obstruction called the 'schrader valve'.
It is directly in the path. But for a rather convoluted route to allow escapement while being held open. Not an easy task for the random chance of direction of travel multiplied by time, or would that be divided by time (?)in your attempt to collect the remaining molecules, as best you can. I mean, eventually, everything will find its way out the hole, but taking that Schrader valve out of the way, without allowing atmospheric pressure to contaminate the system, vastly increases the level of vacuum one can achieve under such conditions. Every little bit helps, and I really mean - every little bit.
Now, some of you may think I am over thinking this, and that it is unnecessary to achieve that level of vacuum for a refrigeration system to work perfectly fine, or on some level of - 'good enough'.
And I think you are probably right. About all of that.
I still stand by using that tool during evacuation, as it saves time, and time is money. And you will produce a better product and get better performance.
I believe the devil is in the details of many situations, so I am kind of 'anal' about the details that are often overlooked by others. I was given a nickname 20 years ago and it stuck.
He calls me. ' Markonius Refrigeranus.
Kind of a Roman title, don't you think?👍🤓 I don't mind it.
That's my comment. Except I left out some of the procedure that is required to reach 100 microns or less in a large system, but I won't go on about it.
That is indeed a very cool tool. I feel the need to have one. It is very useful for changing out the schraders of your car tires at home, without having to use a jack or lift.
But for DIY HVAC? If you need to replace a leaking schrader valve, that means, you'll also be needing a manifold set and a jug of the right refrigeration gas in order to properly refill what leaked out. Might as well call a pro.
But still, I want that tool. Just fiddling with those things can keep me busy for hours.
And there are household applications for that tool, too...
I'd imagine fitting valve stems to some cola bottle caps. And getting a small jug of CO2. With that, I could keep my half empty cola bottles pressurized so the fizziness will always be at the same level as that of a freshly opened cola bottle. Of course I need to be able to change a schrader valve without spoiling any fizziness.
literally was driving home today, stopped and heard a hissing. My AC gas was coming out of the schrader valve! I bumped the pin and it reseated before all the gas was lost. Then i'm thinking how can I recore the valve without losing all the gas. Well here's my answer! Crazy coincidence!
Reminds me of a "hot tap" at the gas plant were I work.
They weld a pipe on to a live line (keeping gas flow to keep weld from burning through, norm. 900 psi @ app 30 mmcf)
Bolt a new valve on, bolt a drill on with an isolated chamber. Drill pipe and back up bit, close valve and remove drill.
They do it so we don't have to go down to tap new lins in or blow down the whole system
I have 20+ year old C&D version of this tool, its very similar except it uses a gate valve instead of a ball valve. I guess it was made before ball valves were invented or manufactured well enough to hold the pressure of refrigerant?
That port is typically used without its schrader for pulling a vacuum. Pulling a vacuum without the schraders in place can easily half its time if not more. Since time is money this results in a higher quality vacuum instead of someone saying "good enough" after an hour. You just need to be careful in the order you connect your vacuum pump because its easy to lose the vacuum if you are running on cruise control and don't put the schrader back in before you take the pump off....ask me how I know...
If anyone here is looking into this tool get the current versions from Appion or C&D.
The problem with the one in the video is its length. Often you'll have a limited distance between the port and another object the port is pointing toward. You'll go to pull the schrader out but be blocked by something you can't move. The brand name version of this tool move the ball valve much closer to the port reducing their overall length. Since the rod that holds the schrader needs to be the length of the tool and you need to pull it all the way out any length savings is doubled when using it.
Great video btw!
You really, really, REALLY need to be sure the valve is seated properly and sealing when removing the tool at 2:50 or you will get about -70C refrigerant on your fingers. I always use gloves with neoprene coating when removing hoses and tools from a pressurized system
Here's an interesting gizmo, Has anyone ever heard of a vortex tube??? Compressed air goes in, scalding air & ice chunks come out....
schrader valves are way common to use in the states. Hell AC's that run on gas yet to you petrol use the same valves. Even Friders. Maybe expand more than where you are from. This is common knowledge here in the US.
Even though you’re not injecting silicone into the system most refrigerants are pretty good solvents. I’m not sure if silicone is soluble in any standard refrigerants but that might be a reason to not use silicon even in relatively innocuous locations such as the one you mention.
My $0.02, you’d probably be 100% fine.
This is similar to installing a new water valve/connection on a pressurized water main. Search TH-cam for "hot tapping water main".
Watching TikTok style video on a desktop monitor, is like watching people through the spacing between fence planks, peeping Tom style.
I can see people with phones that watch videos in portrait mode would have a perfect video, but the rest of us landscape mortals can suck it. 😁
I served in the US Army with a guy who often said, upon parting, "Keep a cool tool, and don't let your meat loaf." Of course I had to watch this video.
Love all your videos. A very cool tool. Surely though a Schrader valve would just suck inwards and leak if the interior was under vacuum? Are they not just designed to stop pressure going outwards not inwards? Curious to know.
Might also be useful for changing leaky valves in large tyres in agricultural or industrial machinery.
I've renewed the vacuum in a liquid nitrogen dewer with a system like this. Instead of unscrewing a schrader valve, it was a normal cap, though. The port on the side was what was used for the vacuum connection.
You're as bad as me, buying tools i will never use, just because they're 'cool'.
Tchotchke's for tech heads.
When you're drawing a deep vacuum on a system, you attach one of these to both the high and low side ports and withdraw the Schrader valves to open up the lines and pull a faster vacuum including hoses that don't have the depressors in the end. Also, you never know when a piece of crap might stick a Schrader valve open and won't seal after the gauges are removed so it's a good idea to have one handy along with a thin glove. There are keyed safety caps required by code to keep the huffers out of AC and heat pumps but the brass flare caps are a minimum to keep the system tight. They have these tools for some automotive ports and they're not very expensive, but a lot of automotive ports don't use Schrader valves.
I have something similar to this for 4x4ing.
So you can let your tired down very quickly and easily.
It appears to be constructed entirely from standard fittings aside from the rear cap and plunger.
Easier to design, produce, modify, and repair. Very good!
I have a similar tool for servicing my second stage scuba regulator. It allows me to balance it while under intermediate pressure (10 bar).
If one was to inflate a racing bicycle tubular tyre to 160 psi, then remove the presta core, it can be quite an exciting challenge avoiding the flying core and also finding it.
These would generally be immediately lubricated in service, as the refrigerant carries a charge of oil as a well-distributed aerosol in operating condition. It takes quite some time, on the order of weeks or months of inactivity, for the oil to fully settle out.
Reminds me of hot tapping on a pipeline. Weld a new stub pipe on the original one, put a valve on the added stub, add another piece of pipe with a drillbit. With the valve open drill through the original pipe, retract drillbit, close valve, remove drillbit, and now you can add pipe as you wish.
It's used by hourly guys evacuating a system as fast as possible without a core in the way. I rarely see Schrader valves spontaneously leak.