1.1 本规范 2. 涵盖阀门锁定装置的应用、设计和材料。 1.2 本规范中描述的I型和II型锁定装置旨在将阀门固定在全开或全关位置。 1.3 本规范不适用于配备阀门制造商锁紧装置的阀门，除非本标准在阀门或其锁紧装置或两者的采购订单数据中引用。 1.4 以英寸-磅为单位的数值应视为标准值。本标准不包括其他计量单位。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification 2 covers the application, design, and materials for valve locking devices. 1.2 Locking devices Types I and II described in this specification are designed to secure the valve in a fully opened or completely closed position. 1.3 This specification does not apply to valves equipped with locking devices from the valve manufacturer, unless this standard is invoked in the procurement ordering data for the valve or its locking device, or both. 1.4 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.