Patent ID: 9694222
Date: 2017-07-04
CPC Classifications: A62C,B05B,F16K

Claim:
1. Method for firefighting using a system having a firefighting medium emitted from one or more nozzles installed on a wall or in a ceiling, where the firefighting medium is supplied and allowed to escape from the nozzle through one or more apertures, the nozzle being provided with an internally arranged valve in sealing contact with a valve seat until the valve is released from its sealing position, said release being caused by a heat sensitive release mechanism acting on the valve, whereby the sealing effect of the valve is relieved, the method comprising: providing a locking force required for maintaining the sealing effect by means of a removable cap or cover acting as part of a locking mechanism, the removable cap or cover attached to and covering at least a part of the nozzle front, the cap or cover extending from the wall or ceiling and covering the nozzle and the apertures of the nozzle, said locking force being established between at least two interacting surfaces; releasing the sealing effect of the valve by removing a sealing effect between said at least two interacting surfaces; allowing the cap or cover to drop off its seat on the nozzle; and relieving the pressure causing the sealing effect on the valve of the nozzle, the removal of the cap or cover being caused by the heat sensitive release mechanism, wherein the cap or cover is releasably attached to the nozzle by means of a locking force, caused by friction established between surfaces on the cap or cover and interacting surfaces on the nozzle front, such locking force being produced by a heat sensitive trigger rod of the heat sensitive release mechanism producing the required locking contact between one or more pairs of interacting surfaces, wherein one end of the heat sensitive trigger rod is in forced contact with a seat fixed to an inner wall of the cap or cover, and an other end of the heat sensitive trigger rod is in forced contact with a seat fixed to an attachment plate attached to a free end surface of the nozzle, wherein the interacting surfaces are inclined or slanted with respect to the axial direction of the nozzle, wherein the heat sensitive release mechanism is positioned between the cap or cover and the nozzle, and the cap or cover is provided with one or more holes in its rim, communicating with the release mechanism through space between the cap and a front of the nozzle.