In fact, when this air valve is used, the pipework can follow the relief of the land (as with drinking water) avoiding extra cost for laying pipes at great depths (reinforced trenches, lowering of ground Water level, ect.) Which are necessary for following a regular pipework profile.
Two functions model
- evacuates the air high flow rate
- Air inlet high flow rate
A variant is proposed by fitting a non-return valve on the air outlet, where the user does not want an air inlet.