What is the proper way to install a safety or safety-relief valve? What mounting orientation should be used to install a safety valve?

Safety and safety-relief valves should be installed vertically with the drain holes open or piped to a convenient location. All piping must be fully supported.

Installing a safety valve in any position other than with the spindle vertical and upright may adversely affect performance and lifetime and may not meet code. Installation in any position other than vertical can violate code standards.