General This Standard Practice covers round opening@ full@ regular and reduced port metal ball valves. End connections covered herein are threaded@ socket-welding@ solder joint@ grooved and flared end in nominal pipe sizes 1/4 through 4 inch. These valves are intended for on-off operation and should be used for modulating or throttling service only when recommended by the manufacturer. This Standard Practice covers ball valves of the following materials: Carbon Steel Alloy Steels Stainless Steels Grey Cast Iron Ductile Iron Malleable Iron Copper Alloy References Standards and specifications adopted by reference in this standard and names and addresses of the sponsoring organizations are shown in Annex A. It is not considered practical to refer to a specific edition of each of the standards and specifications in the individual references. Instead@ the specific edition references are included in Annex A. A product made in conformance with the edition reference applicable during the time of manufacture@ and in all other respects conforming to this standard@ will be considered to be in conformance even though the edition reference may be changed in a subsequent revision of this standard. Description of Valve and Parts Examples of some valve types are shown in Figure 1. When variations of these basic types are used@ they shall be named by the manufacturer. The names of basic valve parts are given in Figure 2. Note: The valve sketches shown in Figures 1 and 2 are for the purpose of illustration and nomenclature only and do not represent or endorse any manufacturer's product.