The purpose of the IOGP S-562 specification documents is to define a minimum common set of requirements for the procurement of ball valves in accordance with API Specification 6D, 25th Edition published November 2021 and Addendum 2, published September 2024, for application in the petroleum and natural gas industries. The IOGP S-562 specification documents follow a common structure comprising a specification, also known as a technical requirements specification (TRS), a procurement data sheet (PDS), an information requirements specification (IRS) and a quality requirements specification (QRS). These four specification documents, together with the purchase order, define the overall technical specification for procurement