scope:

This British Standard specifies requirements for two types, type A and type B (see clause 3), of cast iron gate valves with flanged ends, predominantly key-operated, for underground use for waterworks purposes and primarily for use with potable water. The range of valve sizes covered is DN 50 to DN 600 for nominal pressures of PN 10, PN 16 and PN 25.

This standard does not cover the design of either the obturator or the stem diameter and stem thread lead for type A valves, for which only performance criteria are given.

NOTE 1 The information to be supplied by the purchaser at the time of his or her enquiry or order is detailed in Appendix A.

NOTE 2 The titles of the publications referred to in this standard are listed on the inside back cover.