Dry visor intended to be mounted in a fire protection installation of the type comprising a network of vacuum sprinklers

A dry riser intended to be mounted in a firefighting installation, of the type comprising a network of vacuum sprinklers, with the riser comprising:

• an elongate body having at one of its ends a connecting piece for coupling to a pipe, the connecting piece including a first nozzle configured to provide a connection between the riser and the pipe, with the riser including a first shutoff member for shutting off the first nozzle;
• with the other end of the riser bearing a sprinkler comprising:
• a fixing connector, by which the sprinkler is coupled to the elongate body of the riser, with the fixing connector having a second nozzle;
• a fusible member;
• a second shutoff member for shutting off the second nozzle, held in a shutoff position by the fusible member;
• an ejecting element configured to eject the second shutoff member,
• the riser further comprising:
• a connection between the first shutoff member that shuts off the first nozzle and the second shutoff member that shuts off the second nozzle, wherein said connection is mobile in such a way as to cause the shutting-off position of the second shutoff member to coincide with a shutting-off position of the first shutoff member of the first nozzle,
• wherein the elongate body has an inclined duct for evacuating water, rising towards an outside of the end section, and including a ball that can allow the water to flow in a bottom position in the inclined duct and prevent the water from flowing in a top position in the inclined duct.