F
Foston
I have a leaking Gate Pump Valve which needs replacement. The system has two gate pump valves [GP1 and GP2] either side of a pump. The pipe to the right of the pump [after GP2] is divided one branch going to the boiler and one to a tank [expansion tank?] The expansion tank has a Ball Valve Isolater. The pipe to the left of the Pump [ and it is on this side that I need to change the Gate Pump Valve] divides into two branches. One [B1] goes to the other side of the loft but at the far end [30 feet or so] there is a valve that I can shut off using a screwdriver. I am not able to see where the actual end of this pipe goes. The other branch goes to a Honeywell Motorised Valve Ref V4043H1106. The central heating controls to the boiler have been switched off. The valve on the BI branch has been closed. The valve on the Gate Pump GP2 has been closed. The ball valve Isolator on the expansion tank has been closed. The control switch on the Honeywell Motorised Valve is in the "Auto" position. [The only other position is marked "Manual Open]. However, when I start to disconnect the faulty Gate Pump Valve [GP1] the water appears to be still flowing. Questions; 1. How much water should I expect to flow after I have shut off the supply? 2. Do I need to shut down any other valve etc to ensure the water supply to GP1 is totally Off?
