Are non-return valves required for bath side valves with freeflow bath filler?
Anonymous user 09/03/2024 - 3.05 PM
Hi,
Are non-return valves required for bath side valves going to a freeflow filler? In particular this one:
https://www.victorianplumbing.co.uk/cruze-deck-bath-side-valves-with-freeflow-bath-filler
Additionally (21.11.19).
Thank you for your answers so far.
Additionaly, in-between the free flow overflow and the bath side valves, I intend to have a Bristan thermostatic mixing valve (MT503CP-ISOELB). So where would the one or maybe two non-return valves go? Two before (hot+cold from bath valves to mixing valve hot+cold) or one after the mixing valve (valve to free flow)? Double check or single check valves?
Thank you
Are you a tradesperson and able to answer this question?
Hi Neil. That's a very good question to post, thank you.
If the overflow became blocked the water outlet / nozzle could become below the water line thus a potential back flow under certain conditions. I believe this to be the water reg requirement for check valves / back flow scenarios.
*Check with the manufacturer to confirm their fitting requirements / warranty requirements.
Hope this helps, Bob.
Answered21 November 2019
9
Anonymous user
Having looked at the item description and details on Victorian plumbing, there does not seem to be any means of back flow protection. Although it does state "Manufacturered in accordance with EN 200" which is a British standard for sanitary taps and includes the scope and backflow protection it does not say its wras approved. I would contact the manufacturer and if in doubt put in check (non return) valves anyway. Better to be over cautious and safe.
It really depends upon whether the supplies are mains or gravity fed as to if a check valve is required. Either way if you are incorporating a mixing valve then the pressures need to be balanced. That said, if it were a pumped installation then check valves wouldn't be necessary, however if it were mains fed then either a double check valve or 2 singles must be present between the cold supply pipe of the installation & the main stopcock to prevent potential backflow into the utility main outside, same as for an outside tap. You may already have 1 installed on your incoming main so could possibly negate the need to fit another. If you are fitting a check valve do remember that it needs to be accessible for maintenance.
