Preaction dry pipe alarm valve for a sprinkler pipework

摘要

A preaction dry pipe alarm valve (1) is provided for a sprinkler pipework (24) and sprinklers with a fire detection and extinguishing control panel (26). A water supply (38 and an air feed (37) are selectively in communication with the sprinkler pipework. A pilot control chamber (19) of the preaction dry pipe alarm valve (1) is depressurized in case of a fault message from the fire detection and extinguishing control panel (26). When the pilot control chamber (19) is depressurized and, in the case of a decreasing pressure in the sprinkler pipework (24), a quick opener (40) opens the valve head (2) of the preaction dry pipe alarm valve (1), so that extinguishing water can flow into the dry pipework (24). The system allows very short flooding times for the sprinkler pipework with no additional rapid vents installed in the pipework.

主权项

1. A preaction dry pipe fire protection sprinkler system, comprising;
a sprinkler pipework (24) with a plurality of sprinklers (44); a water supply; a preaction dry pipe alarm valve (1) connected to the sprinkler pipework (24) and to the water supply, the preaction dry pipe alarm valve including a valve head (2), a pilot control chamber (19) and an annular channel (39) disposed in communication with the valve head (2); a fire detection and extinguishing control panel (26); an air feed (37) connected to the sprinkler pipework (24); wherein the pilot control chamber (19) is pressurized by the water supply pressure, the pilot control chamber (19) secures the valve head (2) of the preaction dry pipe alarm valve in a closed position; a quick opener (40) in connection with the preaction dry pipe alarm valve (1), wherein the quick opener (40) is activated only when the pilot control chamber (19) is depressurized in the case of a fault message from the fire detection and extinguishing control panel (26), the fault message being indicative that a failure is detected by the fire detection and extinguishing control panel; wherein the quick opener (40) is connected to the annular channel (39) of the preaction dry pipe alarm valve (1) via pipes, and in the case of the pilot control chamber (19) is depressurized due to the fault message from the fire detection and extinguishing control panel and a decreasing pressure in the sprinkler pipework (24), the quick opener (40) releases air into the annular channel (39), so that the valve head (2) is opened so that extinguishing water from the water supply (38) can flow into the dry pipework (24).