前言本出版物代表了热水供应系统自动气体切断装置的安全运行、坚固耐用的结构和可接受性能的基本标准。它是在热水供应系统自动气体切断装置的制造、测试、安装、维护、检查和研究方面多年经验的结晶。器具本身存在对人员造成伤害的风险，如果完全消除，将破坏器具的效用。本标准中的规定旨在帮助减少此类风险，同时保持设备的正常运行。1.1范围1。1.1本标准适用于新生产的自动气体切断阀和完全由新的、未使用的零件和材料制成的装置。除非另有规定，本标准条款中使用“装置”一词时，指所有类型的自动气体切断装置。 1.1.2当温度传感元件处于210°F（99°C）或更低温度时，自动气体切断装置应运行。在本标准下，工作温度较高的设备是不可接受的。1.1.3附件A“美国独有的项目”包含美国独有的条款。1.1.4附件B，加拿大独有的项目，包含加拿大独有的条款。4.1.5附件C“参考标准清单”包含参考标准清单。

PrefaceThis publication represents a basic standard for safe operation, substantial and durable construction, and acceptable performance of automatic gas shutoff devices for hot water supply systems. It is the result of years of experience in the manufacture, testing, installation, maintenance, inspection and research on automatic gas shutoff devices for hot water supply systems. There are risks of injury to persons inherent in appliances that, if completely eliminated, would defeat the utility of the appliance. The provisions in this standard are intended to help reduce such risks while retaining the normal operation of the appliance.1.1 Scope1.1.1This standard applies to newly produced automatic gas shutoff valves and devices constructed entirely of new, unused parts and materials.When the term #device# is used in a provision of this standard, it refers to all types of automatic gas shutoff devices, unless otherwise specified.1.1.2An automatic gas shutoff device shall operate when the temperature sensing element is at 210°F (99°C) or less. A device with a higher operating temperature is not acceptable under this standard.1.1.3Exhibit A, Items Unique to the United States, contains provisions that are unique to the United States.1.1.4Exhibit B, Items Unique to Canada, contains provisions that are unique to Canada.4.1.5Exhibit C, List of Reference Standards, contains a list of reference standards.