TOILET FLUSH SIPHON UNITS – Repair diaphragm – Plumbing Tips

Posted on: January 22, 2017 by in Plumbing Videos
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TOILET FLUSH SIPHON UNITS – Repair diaphragm – Plumbing Tips


This video covers the siphon or syphon unit flush of a standard toilet. We show you how to repair the diaphragm on the flush, we show you how they work and we demonstate other aspects that can fail. Enjoy!

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Hold tight and welcome to today’s plumberparts.co.uk video. Today we’re going to look into the world of syphon units, we’ve done a load of videos before on how you actually take one of these out and replace it. But we’ve never done a video on actually how they work. So we’re gonna cover that now, but also we’re gonna cover the repair that you can do to these syphon units, to make them work. And also we’re gonna show you, using this lovely clear box here and a bucket just down there how they work. ‘Cause we’re gonna sit it inside this box here and get it running. So I hope you enjoy the video, please remember to subscribe by clicking on the links in the corner or whatever. You can follow us on Twitter and Facebook and let’s go! Hold tight.
So number one, the components you’ll get when you buy one of these syphon units. Firstly you’ve got a compression nut and a rubber O ring here, that you can put your flush pipe into, if you’ve got a flush pipe down. That’s for a cistern that we call a wall hung cistern, that’s not exactly close coupled to the toilet. So basically you can put your pipe up into there, this will go round and as you tighten that up, the rubber compression washer here will compress round onto that pipe and basically make a watertight seal. We’ll look at the other way of sealing one of the cisterns onto a toilet in a second. The other piece you have, is your actual locking nut, okay. What this does is creates compression on the bottom of the toilet cistern which is gonna be in here, onto this rubber little flange just here. So what’s that gonna do when that tightens up, it’s gonna make that really tight and then no water will be put into our makeup system for now. Will be able to leak through when you’re not flushing the toilet.
Before I actually pop this onto our little box that we’ve got here, it’s a great idea to know how to get one of these out. So let’s firstly cover the problems you can get with one of these. Let’s say you’ve got a handle on your toilet flush, and you just keep having to pump it to get it going. The problem with that is, and it’s really, really easy to solve, is that the flap inside here. If you look when pull this up we’ve got a flap that pulls up like that. I mean, it’s so hard if I put it here you can actually see it pushes air out onto my hair. What’s that doing is initiating the syphon. You’ve probably got about a litres worth of water sitting above this flap and when you pull this up, this retaining plastic area here doesn’t allow that water to escape back into the system. It’s only got one place to go. So it’ll fly up here and then down here. This downward action of water flowing through here, acts as kind of a valve and it carries on sucking water. That is the basic principle of a syphon. But how do you ask, does the rest of the water come out and through? Well if you look here, these flaps can lift up like so and basically allow all that water to carry on going through the syphon and then going out down the loo and flushing whatever you’ve put in the loo away. That’s the great thing about them, they go back automatically because underneath you’ve got a spring here, and that is basically the main fault that can go with these, is this flap starts to break and that is always indicative by the fact you have to keep pumping. In the end it does sometimes work. In the end they’re just so broken up and ruined that you can’t get at them to do it. So we’ve done a video on how you remove a syphon unit and they’re really easy to do. A lot of them now are even easier than that, and I have a little yellow pin in here that you can pull out and you can actually just lift top off without even having to drain down the cistern. It’s a majorly good idea, that is. But anyway, say you’ve got your syphon unit out, this will be handle linkage here, so as you pull your handle, that will lift the lever up and lift this piece up here like so. What you wanna do is take this linkage out like that and then you’ll be able to pull out the bottom part of our syphon just like so. Remember you’ve got a couple of washers here in the top, that you don’t want to lose. So look, now you can see, when we pull on that lever, that’s lifting up like so and push all that water up there but then obviously once the water starts to flow, it can go down like that, but it can’t escape when you’re actually trying to start your syphon.

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