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backflow

Backflow is a term in plumbing for an unwanted flow of water in the reverse direction. It can be a serious health risk for the contamination of potable water supplies with foul water. In the most obvious case, a toilet flush cistern and its water supply must be isolated from the toilet bowl. For this reason, building codes mandate a series of measures and backflow prevention devices to prevent backflow.

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  1. T

    Megaflow CL120 Backflow issue.

    Hi, Hi wonder if anyone could help? I have a customer that has recently had backflow problems with her cylinder. She gets very hot water coming through her cold taps in her 3 floored property. I recently changed her ground floor basin taps and in doing so had to drain down the cylinder as a...
  2. Dolidert

    Do we need Backflow testing?

    Hello Plumbers Community! One of my client needs flowback testing service in gold coast, is there any company or individua service provider working here that's offering this service with all modern tools and gadgets. Before further explanation, I want to add the signs that indicates the need of...
  3. B

    Copper connection on backflow

    Hi, trying to remove copper pipe from sprinkler back flow. Used blow torch to soften solder. Did not melt what ever they used on connection. What could they have used instead of solder ? Thank You . BH
  4. T

    Why does my basement toilet backflow?

    Hey there, First time posting here, thanks in advance for any advice you can give. First things first: I'm an idiot and I have no idea about proper plumbing lingo so go easy on me! I'm pretty cash strapped but I have a serious problem with my basement toilet and shower drain - dirty water is...
  5. S

    Backflow prevention on mixer taps

    Hey guys, I’m not completely up to speed on water regs, but what type of check valve has to be fitted on mixer taps that mix in the spout? Double or single? Thanks in advance
  6. B

    What does backflow mean?

    Hi Everyone, what does backflow mean in plumbing terms, what would happen if you had a water backflow problem in your home and how do you prevent it? Any information would be really appreciated, thank you.
  7. S

    Two toilets backflow problem

    Hi, I've got two toilets installed back to back either side of a stud wall, they are joined with a branch, which then flows to the stack and vent. When the further toilet is flushed, it causes the trap level in the near toilet to drop by half inch whilst the other completes the emptying...
  8. P

    Backflow prevention

    What would be a suitable means of preventing backflow for a wash station Belfast sink, hot & cold to tap that has a long arm off it leading upto a spray head that can potentially be submerged in the sink. Sink is at a meat processing factory. many thanks guys Colin
  9. L

    Backflow Prevention

    Hi All, if anyone has a copy of the water regulations guide, second edition page 6.37 second paragraph advises where a combination tap with water mixing in the body is used on balanced pressures single check valves should be used on both sides. If you turn the page 6.38 second paragraph seems to...
  10. R

    Backflow on Vented Gravity System?!

    There's something not right going on. If I can ask a simple question first and then expand on it from there if necessary. It's easy to understand backflow caused by mains cold going through the hw side of a gravity fed system but how can gravity fed hw backflow through the cold pipes of the...
  11. S

    Primary Circuit Backflow in Solid Fuel / Oil Fired system

    Hi Question on how best to design/solve back flow in a Solid Fuel Primary circuit. This is happening when the fire is not lighting and the oil fired boiler is operating into the common dual coil copper cylinder causing the idle stove coil to heat and thus starting back-flow in its circuit...
  12. W

    Backflow prevention drain valve

    I'm looking for something to prevent back flow into a surface water drain when the beck floods. I rember some cast iron thingy from years ago which went in line and had a small chamber with a ball which floated up and closed off an orifice from the land drain which the sewer level rose. None of...
  13. C

    new toilet - 6 litre flush and side exit

    Hi, I'm aware that some modern 6 litre toilets don't flush away well. Does anyone know of a brand which does work okay? Also, I'll have to use a right angled connector for a side exit to the toilet outlet for space reasons. Would this contribute to any problems with flushing? I could...
  14. S

    Cold water in Basin/toilet hot when turning on Bar Thermostatic Shower

    I have a strange problem that has recently arisen. There is a separate shower with a bar thermostatic shower control, a basin and bath. When the thermostatic shower is turned on to warm/hot then the entire bathroom including the toilet cold water has very hot water coming out. There is no cold...
  15. C

    Backflow problems with mixer taps/showers

    Hi, I have a gravity fed traditional system (header tank in loft, hot water cylinder below, gas boiler on ground floor), The problem is an intermittent header tank overflow, that has been on and off for the last 2 years (since new bathroom installed on ground floor). Sometimes there can be no...
  16. S

    SVP Poblem

    Hi, I'm new to this forum but I've got a problem with my house in Spain. About 2 years ago I had an exra bathroom added to my single story property and the existing bathroom renewed by a Bulgarian building company(big mistake and no longer contactable). From the start 1 of the toilets never...
  17. R

    What the difference betwween part 1 and part 2 Ball cocks?

    please tell
  18. U

    Isolating Valves

    Do isolating valves prevent water backflow.
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