What is the main distinction between a V type PSV and a UV type PSV?

The main distinction between a V type pressure safety valve (PSV) and a UV type PSV lies in their specific applications related to different types of equipment. V type PSVs are specifically designed for use on boilers, which operate under unique conditions requiring tailored safety measures due to the high pressure and temperature involved in boiler operations. Conversely, UV type PSVs are intended for unfired vessels and piping systems, which have different operational criteria and safety needs compared to boilers. This differentiation ensures that each type of PSV can effectively manage the safety requirements pertinent to its designated application, maintaining compliance with industry standards and preventing overpressure scenarios that could lead to equipment failure or unsafe conditions.