A pressure regulator comprising a housing containing a channel arranged to communicate a fluid from a fluid inlet to a fluid outlet, said channel comprising a valve seat and closure member with said closure member operable with valve seat to control fluid flow through the channel and; wherein the housing comprises a resilient diaphragm member in fluid communication with the fluid and in physical communication with the closure member such that the diaphragm member is operable to deform in response to a change in pressure of the fluid and such that deformation of the diaphragm member causes the closure member to change position and; wherein that the regulator comprises a deflection member located in the channel and arranged to deflect fluid flowing in the channel such that the closure member is shielded to substantially prevent fluid, that is flowing generally parallel to the movement axis of the closure member, and in a downstream direction, from impinging on the portion of the closure member that is upstream of the valve seat.