Valve with a pilot valve seat arranged in a diaphragm

A valve comprising a main valve, a pilot valve, a housing, an inlet and an outlet, wherein opening and closing of the main valve is controlled by the pilot valve, and wherein a pilot valve seat is arranged in a diaphragm, and wherein a pilot chamber is arranged in the housing separated from the inlet and the outlet by the diaphragm, wherein, a support member supports the diaphragm, and the support member is guided in the housing, and wherein a radial gap is arranged between the radially outer end of the diaphragm and the housing in a radial direction perpendicular to the opening of the pilot valve, wherein the support member is guided in a cylindrical bore of the housing by fitting into the cylindrical bore at a circumferential, radially outer end of the support member such that a surface at the radially outer end of the support member that runs in an axial direction parallel to the opening direction of the pilot valve is in contact with the cylindrical bore of the housing such that the support member is slidingly guided in the cylindrical bore, wherein the support member is a unitary support member.