This standard specifies general requirements for cast iron gate valves: - for all fluids and all places of installations -with flanged,socket orspigot ends Isobaric from Pn6 to PN 25 Isomorphic from PN1 to PN10. The range of nominal sizes covered is: DN40 DN50 DN65 DN80 DN100 DN125 DN150 DN 200 DN250 DN300 DN350 DN400 DN450 DN500 DN600 DN700 DN750 DN800 DN900 DN1000. For particular applications, some specific or alternative requirements and/ or a amendments can be specified by the releva nt performance standards.