This part of ISO 6953 specifies which characteristics of compressed air pressure regulators are to be included in literature from their suppliers. It also applies to filter-regulators. This part of ISO 6953 applies to — manually controlled direct operated types (with or without relieving mechanism), — manually controlled internal pilot operating types (e.g. nozzle flapper), and — external pilot operated types. In addition, it specifies the product marking requirements for pressure regulators and filter-regulators. This part of ISO 6953 is applicable to compressed air pressure regulators with a rated inlet pressure of up to 2 500 kPa (25 bar) and an outlet adjustment pressure of up to 1 600 kPa (16 bar); and to filter-regulators with rated inlet and outlet pressures of up to 1 600 kPa (16 bar), in which the major contaminants are removed by mechanical means. NOTE 1 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2. The rated pressure should be selected from the preferred pressures listed in ISO 2944. NOTE 2 The main characteristics to be included in the supplier's literature related to electrically modulated pneumatic continuous pressure control valves are specified in ISO 10094-1.