Toilets can either work through water pressure, which is more common in commercial applications, or they can function by gravity flow, which is found in most household commodes. Understand how toilets work with tips from a master plumber in this free video on bathroom maintenance.
Hi, my name is Brent Miller, and today we're going to talk about how does a common household commode work. There are two types of common household commode, some are what they call a duel tank, or a diaphragm type tank, and these work off water pressure, and that causes them to flush some what, a little bit stronger, but most of the time they're used in a commercial application. Also, you have the gravity flow, and that's the main one we're going to concentrate on today. The gravity flow, it works in the sense that you have the water closet in the back, and of course, it's full of water, and generally has between two and three gallons of water in it, and sometimes there are state law regulate on how much water they can actually hold in them. But, and then you have this flapper valve, and you have this in the back, inside your water closet, the bowl in the back behind the toilet, where the water stays, and then you can, this is the actual flapper, and it works. And what happens is you have two to three gallons of water surrounding this area right here, and then you pull this up, and then of course that water rushes through this hole, and, and it causes, as it's flowing down through the sewage, it causes suction, so which is what causes the water to rush out of the bowl, along with the waste, or what ever it is you want to get rid of. Then, and this is how that part works there, and you can understand the, the visual here as you flush this handle, it pulls this and lets all this water out. Now let's talk a minute about how the actual water gets in to the water closet in the first place, and again, the water is the bowl behind the back of the toilet. You have what they call this flow valve, or flush valve, and what happens is water, you have a supply line that comes in to the bottom here, and it screws on to this part right here, and it screws on right here. And then you have water supply, and this is a little valve right here. And then what happens, as the bowl fills up with water, this connects in to the bottom of the bowl and sticks up there, and you've probably seen them. Sometimes they have that little arm that comes in, and it's got that little black ball on the end of it, and it works the same way, except this ones a little more compact, and it's less likely to get hung up on different things. But as you pull, as the water fills in, and it, this thing is very light weight, and it fills up and it controls this valve right here, and as this valve closes, it prevents water from coming in. Also, you have this little adjustment right here that you can turn, and as you turn this, this controls how high this, the water level is, and it controls how much this goes up, and you do that by turning this right here. A lot of people underestimate the importance of this little water tube. This little water tube goes in to the over flow valve. And this water tube, and these two are connected, the over flow tube and the flush valve are connected by this little tube right here, and it connects right on to the side of it, and it does it just like this, and as you put it on there, it, and what happens is this water goes in to this over flow tube, which is in the bottom, and it goes in to, and it goes, by going in here it goes directly in to the toilet. And because when you push all that water down through there, it sucks all the water out of the bowl, and, and this, as the water fills back up, it comes out of this tube, and it, it's what replenishes the water and builds up the water level inside your bowl.