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One way of delivering oxygen to somebody is using a demand valve. Now in other videos we're looking at a constant flow type outlet where you are running a set amount of oxygen coming through a pipe. We should be running at between nought and maybe in some cases 25. But often 15 litres per minute. What a demand valve does, it gives you all you want. So if you put the mask onto somebody and they breathe in really, really fast and very, very deeply, it will give them every single bit of oxygen. So it delivers 100% pure oxygen.

Now this is a typical demand valve system here. It works on a Pin Index System. And you got the regulator standard, and then we have the demand valve outlet. And then it goes through to this end where you have the valve itself. And on the valve, the oxygen is coming through and the regulator works that it allows the oxygen to come out only when you are breathing in. Now this works very similar to the likes of an ENTONOX cylinder or scuba regulator, if you've been diving. As much as you want to breathe in, it will give you as much oxygen as you need.

Now it won't leak. It's not like a constant flow which is always coming out. It only comes out when the person's breathing in. What you can do with this is take a TrueFIT mask or other mask and these come in different sizes. This is an adult size. It pushes onto the end. Just seal it on.

And then from there the person can take the mask, put it over their mouth and they can just breathe normally. Now they are holding this in place themselves. So they are making sure they get the oxygen that they need. Unlike a constant flow, when they take it away, there's no other oxygen coming out. So it's just exactly what they want as they breathe in.

Now with these types of demand valves you can also use a standard pocket mask. And pocket mask will then, the valve will come off and the hole on there is the same size as the other mask and that will fit in place. So if you don't have one of those, you can actually use the pocket mask onto their face as well.

Now we have included these on the course because they are used as another way of delivering oxygen. If you are working within the medical sector, this type of system is not as common. But if you are working someplace in the leisure sector, particularly areas where oxygen is so important, would be things like scuba diving where you must be able to deliver oxygen at very high concentrations, that's where this would be absolutely ideal. This system would only be used for somebody who is conscious and able to breathe themselves. So if you got somebody who's unconscious, you'd have to switch from this to a non-rebreather mask on constant flow.

Now one other thing this will do is to be able to resuscitate somebody. This particular unit, you have them with or without, you have a standard demand valve or this one's got with a manually triggered valve. And that's the button on the end here. When you push this button, it will allow oxygen to come out. Now what this is used for, it can be used for resuscitation. It's a forced air ventilation system. So you could place the mask over the patient with their airway open, and then you can push the button which will put 100% oxygen in and inflate their lungs. You can't overinflate 'cause as soon as it gets to a preset resistance, the valve will stop it. No more will come out. You'd need to physically release the valve and then push it in again. So there's no way you can overinflate somebody's lungs.

Now this is again only used in very specialized applications. And the only real one with these within the scuba diving world. You would have to be trained in order to use this type of valve. So if you see one of these and you are using it as a standard demand valve, just bear in mind what that is. If someone is conscious and breathing, they don't wanna be pushing that because it's just going to be forcing oxygen through. So when they are holding it, make sure they would hold it without the fingers on the end button.