There are two main types of safety valves that are available, but when it comes to the specific ones, there are so man that can be considered. There are different applications that are required, and the various performance criteria will be needed by those industries.
The two most common safety valves that are used are called ASME 1 Valve, which is used for most boiler applications. ASME VIII valve is used to prevent overpressure that may happen when there are different valves that are available. It will help to know the different types of valves available so that you can tell which ones will be perfect, depending on the applications that are available.