Looking down a recent hole-in-the-pavement in its maturing phase (left to its own devices for a week), found they had removed a chunk of what I think is the water main and added a "stopcock". But they also fitted a bypass with an intricate-looking thing in the middle. Anyone know what it is?
2 pics here (the blue pipe at the bottom left is just being used as a wedge):-
It looks like its a venturi flow meter
Jon
They look a bit like solenoid operated valves, and this, along with the small-bore flexible pipes attached, suggest that it might be some sort of automatic chemical 'dosing' or maybe sampling unit perhaps ?? Any signs of any power being run to the hole from anywhere ?The guys are gonna be there for at least another day at some point sorting out the reinstatement. Keep an eye out for them, and ask.
Arfa
I'd make a guess that the branch device is an orifice plate with pressure sensing tubes connected either side. The main line gate valve will be normally shut except for emergency use such as downstream fire hydrant operation. The water flow will then be forced through the orifice, developing a diferential pressure proportional to the magnitude of the flow and this diferential used to derive a metered consumption for charging or monitoring purposes. If there is a badge with a makers name on it you could google their site for confirmation.
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