Abstract: A new and improved fluid restrictor means for use in a valve structure, as a backpressure plate, or the like and generally comprising a plurality of close-fitting mating cylindrical parts each of said parts including a plurality of openings spaced across the surface thereof. The mating parts are rigid in construction and arranged and configured whereby they are in a contacting relationship and the openings of contiguous mating parts are in an overlapping relation to form restricting orifices for flow communication between complementary openings. The volume of each of the openings is sufficient to form an expansion chamber for high pressure fluid flowing thrugh the restrictor means. The disclosed fluid restrictor means provides a structure which is easily arranged according to precise engineering specifications for a particular application.