BS EN 144-3:2003 pdf download.Respiratory protective devices — Gas cylinder valves — Part 3: Outlet connections for diving gases Nitrox and oxygen.
1 Scope This European Standard is applicable to a thread connection used for the connection between a gas cylinder valve and a pressure reducer for respiratory equipment for diving containing breathable nitrox gas with an oxygen content greater than 22 % or oxygen. This European Standard specifies the dimensions and tolerances for connections which are used for respiratory equipment. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and, the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 144-1, Respiratory protective devices – Gas cylinder valves – Part 1: Thread connections for insert connector
3 Thread connection for valve outlet 3.1 Thread connection for pressures up to 250 bar (nominal pressure 200 bar) Figure 1 shows the thread connection and its dimensions to be used for cylinders with a maximum filling pressure of 250 bar. Dimensions in millimetres Tolerance: ± 0,1 mm unless specified
3.2 Thread connection for pressures between 250 bar and 350 bar (nominal pressure 300 bar) Figure 2 shows the thread connection and its dimensions to be used for cylinders with a maximum filling pressure of 350 bar. Dimensions in millimetres Tolerance: ± 0,1 mm unless specified
4 Marking In addition to the marking required in EN 144-1 the valve outlet connection shall be permanently marked with “200” for nominal pressure 200 bar connections and with ”300” for nominal pressure 300 bar connections.BS EN 144-3 pdf download.