热膨胀泄压阀是一种用于管道系统的泄压装置，用于防止因有限体积的截留工艺流体的热膨胀而导致的过压。热膨胀安全阀通常用于低温液体或冷气体可能被困在两个阀门之间或两个装置之间的管道系统。热膨胀安全阀也称为线路阻塞安全阀、pop安全阀或热安全阀。本出版物阐述了这些阀门的安装和重新测试要求。

A thermal expansion relief valve is a pressure relief device used on piping systems to prevent overpressurization caused by the thermal expansion of a limited volume of trapped process fluid. A thermal expansion relief valve is normally used on piping systems where cryogenic liquids or cold gases can be trapped between two valves or between two devices. Thermal expansion relief valves are also called line block safeties, pop safeties, or thermal relief valves. This publication addresses requirements for installation and retesting of these valves.