check valve

I have a customer that has had 2 main drain blockages due to another problem. Whilst they were blocked the main soil stack started to fill with waste which back flowed along the 1 1/2 waste pipe and came up into the sinks. The mains will get sorted but I would like to know if there is an in line...

Ladies and Gents, I have been called to see a customer who has recently developed water hammer on her rising main. The hammer is close to the kitchen sink. The washing machine is connected to the rising main from a tee and hammer occurs when the machine valves operate. I know that is nothing...

I ieed help pls . The system is :an electric boiler ,pump for flow,3 port valve, open dhw cylinder and a second pump which is connected to the dhw pipe, out to the consumer .The problem I have is that the second pump, (dhw /shower/tap) is running more or less all the time even though no...

hi all this is my first post I got called out the other night to sort a overflowing cold water storage tank after inspection the ball float valve is fine not passing, after a short while the lady of the house informs me, that it happens when they get a shower. After inspecting shower i find the...

My father in law has an old oil heating system about 30 years old. A valve is leaking on the pipework and I'm not sure what it is. It is situated near the boiler end on the pipe running from the boiler to the cylinder (entering near the top half of the cylinder), which I assume is also the...

Is it compulsory to have a non return valve at entry of property after main stop valve? Also why is it wrong to use a lever valve (one that works on mains) in the place of a stopvalve to a dwelling? Thanks again folks look forward to your replys!!

Hi All My first post on this forum so hello to you all ! :) My flat as a gravity fed hot and cold feed for the bathroom. The kitchen has a mains fed cold and a gravity fed hot for my mixer tap.The hot water pressure is dire and you have to turn the cold practically off to get warm water...

i removed old bath taps and replaced them with ceramic disc one the flow has been reduced y is this the taps r ment 4 hi and low pressure systems all the pipes r 22mm and it has full bore lever valves with double check valves as stated in the instructions aswell as the water regs .does the check...

Helped my neighbour replace an old single rad(approx 30yrs old) for a new double rad, had to alter old pipework to fit new valves. So drained down the sysyem, altered pipe to suit new rad refilled the system and bled the rads. Switched on heating all come on fine and went off ok, but when the...

Do isolating valves prevent water backflow.

How can you increase the Water Pressure ?