本文件规定了用于燃气燃烧器和燃气器具（以下简称“恒温器”）的机械式燃气恒温器的安全、结构、性能和测试要求。 本文件适用于标称连接尺寸小于等于DN 50且声明最大入口压力小于等于50 kPa的机械式气体恒温器，用于天然气、人造气或液化石油气（LPG）。不适用于腐蚀性气体和废气。 本文件适用于机械恒温器: -？通过一个整体式气阀直接或间接控制气体流量，且其操作不需要外部电能； -？用于恒温器不直接暴露于室外环境的燃气器具；和 -？用于操作控制功能。 本文件仅涉及型式试验。

This document specifies safety, construction, performance and testing requirements for mechanical gas thermostat intended for use with gas burners and gas burning appliances hereafter referred to as “thermostats”. This document applies to mechanical gas thermostats of nominal connection sizes up to and including DN 50 with declared maximum inlet pressures up to and including 50？kPa, for use with natural gas, manufactured gas or liquefied petroleum gas (LPG). It is not applicable to corrosive and waste gases. This document applies to mechanical thermostats: —？controlling the gas flow directly or indirectly through an integral gas valve, and which do not require external electrical energy for their operation; —？used on gas appliances where the thermostat is not directly exposed to the outdoor environment; and —？which are intended for operating control functions. This document covers type testing only.