A spray nozzle chip (1-1) comprising: a first layer (3) provided with a first layer orifice (3a), and a mechanically flexible nozzle layer (5) provided with a nozzle orifice (5a), wherein the first layer (3) has a valve seat (3b) arranged aligned with the nozzle orifice (5a), wherein the spray nozzle chip (1-1) has a valve functionality obtained by movement of the nozzle layer (5) relative to the valve seat (3b) due to pressure changes, and wherein the nozzle layer (5) is arranged at a distance from the valve seat (3b) when the nozzle layer (5) is in a default non-pressurised state, whereby a gap with a gap length (L) is formed between the nozzle layer (5) and the valve seat (3b), wherein the gap length (L) is smaller than a dimension of a specific bacterial type, to thereby seal against bacterial ingrowth through the nozzle orifice of the specific bacterial type.
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