Steam-valve is a mechanical device used to control the flow of steam in a system. It is essential in regulating the pressure of steam and preventing accidents due to over-pressurization. Some common synonyms for the word steam-valve include pressure valve, relief valve, control valve, and safety valve. These terms are all used interchangeably in the industry as they all refer to devices that relieve excess pressure in a system. Other related terms include pressure regulator, pressure relief device, and pressure control valve. Regardless of the specific term used, all of these devices play a critical role in ensuring the safe and efficient operation of steam-based systems.