their high elongation capacity and robustness allow them to easily accommodate irregular or soft subgrades while preventing damage to the nonwoven structure itself when covered with stone. the three-dimensional needle-punched structure of crimped fibres provides high abrasion characteristics and resistance...
pilot valve a half turn and then reading the downstream pressure, gradually adjust the pressure: counterclockwise to decrease (-) the downstream pressure or clockwise to increase (+) the downstream pressure. repeat the starting-up procedure, steps - . caution: small changes in the adjustment of the needle...