A pump for a system for dispensing a liquid as a spray, in particular for a dispensing system which comprises a compressible container , wherein said pump comprises - a housing forming a chamber and a dispensing opening , wherein said pressure in said chamber may be varied for pumping liquid from said container to said chamber , and further from said chamber to said dispensing opening , and - a regulator being fixedly arranged in said chamber , said housing being resilient and having a longitudinal direction (L), said regulator comprising - an inner valve for regulating a flow of liquid between said container and said chamber , - an outer valve for regulating a flow of liquid between said chamber and said dispensing opening , and - a stem extending in said longitudinal direction of said housing at least between said inner valve and said outer valve , said stem being resilient along its length so as to be sideways bendable from an original shape to a distorted shape, characterized in that said regulator further comprises a displacement guide located at an outer portion of said stem on an inner side of said outer valve , and said housing comprising a guide region located adjacent to said displacement guide , an outer perimeter of said displacement guide and at least a portion of an internal surface of said guide region being adapted to each other so as to allow relative displacement between said displacement guide and said guide region substantially along said longitudinal direction (L) of said housing , so as to transfer said sideways bending of said stem to a relative displacement between said outer valve and said housing along said longitudinal direction (L) of said housing . wherein said pump comprises - a housing forming a chamber and a dispensing opening , wherein said pressure in said chamber may be varied for pumping liquid from said container to said chamber , and further from said chamber to said dispensing opening , and - a regulator being fixedly arranged in said chamber , - a housing forming a chamber and a dispensing opening , wherein said pressure in said chamber may be varied for pumping liquid from said container to said chamber , and further from said chamber to said dispensing opening , and - a regulator being fixedly arranged in said chamber , said housing being resilient and having a longitudinal direction (L), said regulator comprising - an inner valve for regulating a flow of liquid between said container and said chamber , - an outer valve for regulating a flow of liquid between said chamber and said dispensing opening , and - a stem extending in said longitudinal direction of said housing at least between said inner valve and said outer valve , - an inner valve for regulating a flow of liquid between said container and said chamber , - an outer valve for regulating a flow of liquid between said chamber and said dispensing opening , and - a stem extending in said longitudinal direction of said housing at least between said inner valve and said outer valve , said stem being resilient along its length so as to be sideways bendable from an original shape to a distorted shape, characterized in that said regulator further comprises a displacement guide located at an outer portion of said stem on an inner side of said outer valve , and said housing comprising a guide region located adjacent to said displacement guide , an outer perimeter of said displacement guide and at least a portion of an internal surface of said guide region being adapted to each other so as to allow relative displacement between said displacement guide and said guide region substantially along said longitudinal direction (L) of said housing , so as to transfer said sideways bending of said stem to a relative displacement between said outer valve and said housing along said longitudinal direction (L) of said housing . <EOS>