We've had ongoing problems with a megaflo that loses its air gap approx every 4 weeks or so and have had a unvented qualified plumber looking at it.
So far he has cleaned the pressure reducing valve, replaced the the expansion relief valve and fitted an external expansion vessel.
Since that work, the system will work fine a similar length of time as it used to take for the airgap to go and then we start to get a banging and 'trumpeting' noises when the hot tap is turned on and off. Following the airgap replacement procedure fixes it again.
I've had the plumber back and he says that its because we've got 'mixer taps' with the hot water supplied via the megaflo and the cold water coming straight from the mains. He says that he thinks cold water is leaking through the mixer taps and bypassing the pressure reducing valve. He doesn't think he needs to replace the pressure reducing valve but wants to re-plumb the mixer taps.
All sounds fine, except the mixer taps he refers to are not what i would call mixer taps. They are normal taps that share an outlet but have two separate ceramic valve inserts that control the water flow.
Surely if one of these ceramic valves were leaking the water would just come out of the tap and couldn't pressurise the megaflo?
Advice appreciated.
So far he has cleaned the pressure reducing valve, replaced the the expansion relief valve and fitted an external expansion vessel.
Since that work, the system will work fine a similar length of time as it used to take for the airgap to go and then we start to get a banging and 'trumpeting' noises when the hot tap is turned on and off. Following the airgap replacement procedure fixes it again.
I've had the plumber back and he says that its because we've got 'mixer taps' with the hot water supplied via the megaflo and the cold water coming straight from the mains. He says that he thinks cold water is leaking through the mixer taps and bypassing the pressure reducing valve. He doesn't think he needs to replace the pressure reducing valve but wants to re-plumb the mixer taps.
All sounds fine, except the mixer taps he refers to are not what i would call mixer taps. They are normal taps that share an outlet but have two separate ceramic valve inserts that control the water flow.
Surely if one of these ceramic valves were leaking the water would just come out of the tap and couldn't pressurise the megaflo?
Advice appreciated.