本文件提供了变速箱的基本要求，以操作手动和自动开/关和调节功能的工业阀门，包括手动超控变速箱。它包括分类、设计和合格评定方法的指南。 它不包括作为阀门和水下齿轮箱设计组成部分的齿轮系统。 订购前，买方与制造商或供应商（第一方）商定了与本文件规定不同的其他要求或使用条件。

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.