O&M Manual v.1.42 October 2017
13
Pressure relief valve: releases water if the pressure at the UF membrane has exceeded 0,7 bar and/or
when pumping during backwash
Backwashing takes about 30 - 60 seconds and stops automatically. The backwash has
stopped once the indicator on the manometer has dropped to between 0
– 1 bar and only a
trickle of water comes out of the drain hose.
- Once the backwashing is completed, you can continue with pumping and purifying water.
5.2 First back-wash is not working
Note: due to transport and/or storage or not using the Villagepump for a longer period
it could occur that the (first) backwash is not working and the pressure reaches 4 bar
or more. If the pressure reaches more than 4 bar, water will come out of the pressure
relief valve with the red knob (see picture below)
Pressure relief Valve: in operation when pressure in the system exceeds 4 bar
If this situation occurs, please follow instructions below.
- When the pressure is reaching 4 bar,
unlock the padlock, open the cover and give a gentle
slab on the metal valve cover (indicated by green colour in the picture below). Usually the
valve opens and the Villagepump starts back-washing. Next time the pressure should be
between 2.9 and 3.6 bar.
However if this does not work, follow the instructions below.
- Open the small blue valve/tap (close to the valve) to release the pressure; the barometer
will go down to app. 1 bar; close the valve/tap again.
