FIRE DETECTION SYSTEM

摘要

The present invention relates to a fire detection system arranged for detecting fire by detecting a pressure drop in a detection conduit (15) caused by rupture of the detection conduit (15). The system comprises a detection fluid container (13) for holding a pressurized detection fluid, the detection conduit (15) which is connected to the detection fluid container (13), and a valve assembly controlling the supply of detection fluid from the detection fluid container (13) to the detection conduit (15). The valve assembly (17) is configured to assume: i) an open operating state, in which the valve assembly (17) permits fluid communication between the detection fluid container (13) and the detection conduit (15), wherein the valve assembly (17) comprises a holding member (41a) upon which a pressure force exerted by pressurized fluid in the detection conduit (15) acts to maintain the valve assembly (17) in the open operating position, and ii) a closed state, in which the valve assembly (17) prevents fluid communication between the detection fluid container (13) and the detection conduit (15), wherein the valve assembly (17) is arranged for switching from the open operating state to the closed state upon a reduction of the pressure force exerted on the holding member (41a) caused by said pressure drop in the detection conduit (15), such that outflow of detection fluid is stopped. The present invention also relates to a method of controlling such as fire detection system.

主权项

1. Fire detection system arranged for detecting fire by detecting a pressure drop in a detection conduit (15) caused by rupture of the detection conduit (15), the system comprising:
a detection fluid container (13) for holding a pressurized detection fluid, the detection conduit (15) which is connected to the detection fluid container (13), and a valve assembly (17) controlling the supply of detection fluid from the detection fluid container (13) to the detection conduit (15), characterized in that, the valve assembly, the valve assembly (17) is configured to assume:
i) an open operating state, in which the valve assembly (17) permits fluid communication between the detection fluid container (13) and the detection conduit (15), wherein the valve assembly (17) comprises a holding member (41a) being a plunger holding surface (41a) of a valve plunger (41) of the valve assembly (17) upon which a pressure force exerted by pressurized fluid in the detection conduit (15) acts to maintain the valve assembly (17) in the open operating position, andii) a closed state, in which the valve assembly (17) prevents fluid communication between the detection fluid container (13) and the detection conduit (15), wherein the valve assembly (17) is arranged for switching from the open operating state to the closed state upon a reduction of the pressure force exerted on the holding member (41a) caused by said pressure drop in the detection conduit (15), such that outflow of detection fluid is stopped.