The Model VXD Data Center Upgradeable Pre-Trimmed Riser Assembly with or with an Isolation Butterfly Valve utilizes a Viking Model VXD Deluge valve and trim as a dry pipe system. The trim includes the A-1 Differential Valve (with a differential design of approximately 6:1) to control the water supply to the sprinkler system piping that is equipped with closed sprinklers. The system piping is pressurized with compressed air or nitrogen. A riser check valve is included to isolate the system air pressure from the outlet chamber of the deluge valve. The Model VXD Data Center Upgradeable Pre-Trimmed Riser Assembly is intended to be used as a dry pipe system that can be easily converted to a preaction system.