本文件为变速箱操作手动和自动开\/关和调节功能的工业阀门提供了基本要求，包括手动超驰变速箱。它包括合格评定的分类、设计和方法指南。它不包括在阀门和海底齿轮箱设计中不可或缺的齿轮系统。订购前，买方与制造商或供应商（第一方）商定与本文件中所示不同的其他使用要求或条件。

This document provides basic requirements for gearboxes to operate industrial valves for manual and automated on/off and modulating duties, this includes manual override gearboxes. It includes guidelines for classification, design and methods for conformity assessment. It does not cover gear systems which are integral part in the design of valves and subsea gearboxes. Other requirements or conditions of use different from those indicated in this document are agreed between the purchaser and the manufacturer or supplier (first party), prior to order.