Fire-fighting nozzle, fire-fighting system, and method for operating a fire-fighting system

Abstract

Firefighting nozzle with a tubular inlet having an inlet opening, wherein the inlet extends along a longitudinal axis from the inlet opening towards a shut-off valve, a tubular outlet with at least one nozzle opening, wherein the outlet extends along a transverse axis extending transversely to the longitudinal axis towards the nozzle opening, wherein the shut-off valve is arranged between the inlet and the nozzle opening and seals the outlet in a sealing area relative to the inlet, characterized in that a radial distance of the sealing area from the longitudinal axis is less than or equal to a minimum radial distance of the inner surface of the inlet opening from the longitudinal axis in an area between the inlet opening and the sealing area.

Description

[0001] The subject matter relates to a firefighting nozzle, a firefighting system, and a method for operating a firefighting system.

[0002] Firefighting systems with thermally activated nozzles are typically either dry-stressed or wet-stressed. The advantage of dry-stressed systems is their frost resistance, since in the idle state—i.e., when no fire has been detected and the system is ready for use—the supply lines and firefighting nozzles are free of extinguishing fluid, especially water.

[0003] Liquid extinguishing fluid, especially water, even when mixed with additives, is at risk of freezing. The natural expansion of the water during freezing can cause damage to pipes and nozzles. This problem does not exist in dry-preloaded systems.

[0004] However, if such dry-biased firefighting systems are activated—i.e., switched from their idle state to the active state in the event of a fire or a fire alarm—the pipeline is flooded with extinguishing fluid. The extinguishing fluid flows through the pipeline and reaches the firefighting nozzles. The extinguishing fluid is expelled from the system by the actuating firefighting nozzles. These firefighting nozzles must be replaced after the fire has been successfully extinguished.

[0005] On the other hand, however, those firefighting nozzles that were not triggered during activation remain installed in the system after activation. However, flooding the piping system during activation also floods the supply lines to these firefighting nozzles with extinguishing fluid.

[0006] After replacing the activated firefighting nozzles, the system's pipes are drained and the system is dry-primed again. After draining, no extinguishing fluid should remain in the pipes. However, the extinguishing fluid remaining in those firefighting nozzles that were not activated poses a problem. It cannot always be guaranteed that the extinguishing fluid will drain from all firefighting nozzles by gravity during draining. However, this non-draining extinguishing fluid represents a significant potential for damage, as it can freeze and then cause damage on-site due to its expansion.

[0007] Due to space constraints, firefighting systems, especially the piping, are usually mounted below the ceiling. In the simplest case, the firefighting nozzles could be installed in the angled section of the piping facing the ceiling, allowing them to drain naturally, driven by gravity. However, in this case, the firefighting nozzles are directed toward the ceiling and, upon activation, would initially discharge the extinguishing fluid toward the ceiling.

[0008] The effect can be minimized through structural measures, but the pipeline running underneath represents a spray obstacle. This limits the application and distribution of the extinguishing fluid.

[0009] However, since firefighting nozzles are qualified for a specific purpose, their placement within the room is crucial for proper installation. A firefighting nozzle qualified for vertically downward use cannot simply be used upward, especially vertically upward. This would contradict its qualification and constitute an installation defect.

[0010] The effort required to qualify firefighting nozzles is considerable, so there is a need to be able to install already qualified firefighting nozzles in dry-prestressed firefighting systems in a frost-proof manner.

[0011] WO 2016 / 071869 A1 relates to a valve for an atomiser head and in particular for an atomiser head used in a fire extinguishing system.

[0012] JP 2013-192752 A relates to a sprinkler head attachment for use in a sprinkler extinguishing system.

[0013] JP 2006-305376 A relates to a sprinkler head bracket connected to a fire extinguishing line.

[0014] Based on this state of the art, the object of the invention was to provide a fire-fighting nozzle, a fire-fighting system and a method which enables frost-proof use in dry-prestressed fire-fighting systems.

[0015] This object is achieved by a fire-fighting nozzle according to claim 1, a fire-fighting system according to claim 10, and a method according to claim 11 solved.

[0016] A firefighting nozzle can be equipped with either a sprinkler nozzle insert or a fog nozzle insert. When using a fog nozzle insert, the extinguishing fluid is finely atomized, especially at high pressure, in the event of a fire, which promises particularly effective firefighting.

[0017] The extinguishing fluid is, in particular, water, but can also be another liquid. Whenever water is mentioned below, this can also refer to any other liquid extinguishing fluid. Whenever extinguishing fluid is mentioned below, this can also refer to water or another liquid extinguishing fluid.

[0018] The firefighting system in question is, in particular, a dry-pressure firefighting system. The pipes of the dry-pressure firefighting system are pressurized with a static gas pressure in the idle state. Fire detection devices, which can be located directly at the firefighting nozzle, can detect a fire, for example, due to a rising temperature. In such a case, the fire detection devices are triggered and allow gas to escape from the piping system. The resulting pressure loss can be detected, and the firefighting system can be flooded with extinguishing fluid.

[0019] Extinguishing water can be released from the fire-fighting nozzles assigned to the fire, e.g., because they have been triggered, and used to fight the fire. After the fire has been successfully extinguished, the extinguishing water is drained from the piping system, and the activated fire-fighting nozzles are replaced. Non-activated fire-fighting nozzles, however, remain in the system.

[0020] To drain the water from the non-replaced firefighting nozzles, these have a tubular inlet with an inlet opening, with the inlet extending along a longitudinal axis from the inlet opening toward a check valve. The firefighting nozzle is attached to a pipeline with an inlet opening, and extinguishing fluid can enter the tubular inlet via the inlet opening and flow from there toward the check valve. When installed, the nozzle's longitudinal axis runs horizontally. The position of the longitudinal axis relative to the horizontal preferably has a tolerance range of -5 to 45°.

[0021] The shut-off valve can be closed in the rest state and only open in the activated state.

[0022] A tubular outlet with at least one nozzle opening can be provided on the shut-off valve, wherein the outlet extends along a transverse axis running transversely to the longitudinal direction toward the nozzle opening. This means that the inlet and outlet, or the longitudinal axis and transverse axis, extend in an L-shape relative to one another. The inlet is a first leg along a first direction, and the outlet is a second leg along a second direction. This makes it possible to arrange the fire-fighting nozzle on a suspended ceiling installation on the pipeline and to position the outflow direction of the nozzle opening downwards. This allows those nozzle inserts that are qualified for a downward spray pattern to be inserted into the nozzle openings.By aligning the discharge direction in the installation position essentially vertically, any desired spray pattern can be generated by the nozzle, especially in the downward area, since the area below is free of spray obstacles in the form of pipes.

[0023] However, the height of the nozzle is lower than if the inlet and outlet extended along a common axis.

[0024] The check valve is located between the inlet and the nozzle opening. The check valve is designed to seal the outlet from the inlet in a sealed area when inoperative. This prevents extinguishing fluid from passing from the inlet to the nozzle opening via the sealed area. For this to happen, the check valve must first open, which only occurs when activated.

[0025] After activation, the nozzle must be drained. To this end, it is now proposed that a radial distance of the sealing area from the longitudinal axis be less than or equal to a smallest radial distance of the inner circumferential surface of the tubular inlet from the longitudinal axis in a region between the inlet opening and the sealing area. The longitudinal axis is in particular the center axis of the inlet, in particular of the tubular inlet. Starting from this center axis, the inner circumferential surface of the tubular inlet has a radial distance. In the region between the inlet opening and the sealing area, the inner circumferential surface has a radial distance from the longitudinal axis. This distance can be constant or variable, stepped or continuous between the inlet opening and the sealing area. The radial distance increases in the tubular inlet, starting from the inlet opening towards the sealing area.In particular, the diameter of the tubular inlet tapers towards the sealing area.

[0026] The radial distance of the sealing area from the longitudinal axis is smaller than the radial distance from the longitudinal axis in the area between the inlet opening and the sealing area. In particular, the radial distance increases continuously from the sealing area to the inlet opening in the tubular inlet, whereby the increase in the radial distance can be continuous and / or stepped. This smallest radial distance in the sealing area ensures that, when the inlet of the firefighting nozzle is installed horizontally, extinguishing fluid flows safely and reliably from the sealing area via the inner surface of the firefighting nozzle, driven by gravity.

[0027] The firefighting nozzle is mounted on the pipeline in a horizontal plane, i.e. the longitudinal axis runs in a horizontal plane in the mounting position of the firefighting nozzle. The design also allows for tolerances from the horizontal, with the range preferably lying between -5 and 45°, rising towards the shut-off valve. The supply line to the firefighting nozzle also runs in this plane. If the radial distance of the sealing area is smaller than any radial distance of the inner shell surface from the longitudinal axis between the sealing area and the inlet opening, this ensures that extinguishing fluid flows from the sealing area to the inlet opening by gravity, thus draining the firefighting nozzle.

[0028] According to one embodiment, it is proposed that a spring acts on a valve stem of the shut-off valve. This spring can move the shut-off valve from a rest position to an activated position. In the event of activation, the shut-off valve can be released for movement, and this movement is effected by the spring force. In particular, the shut-off valve is hinged to fire detection means, in particular mounted on the fire detection means. When the fire detection means is triggered, this mounting is released, and the shut-off valve or valve stem can be moved toward the fire detection means, driven by the spring force. This releases the sealing area, allowing the extinguishing fluid to flow out of the fire-fighting nozzle.

[0029] According to one embodiment, it is proposed that the spring is mounted against a radially inwardly pointing collar on the tubular inlet. The check valve moves in particular transversely in the longitudinal direction. Viewed in the longitudinal direction, a fire alarm device is located, for example, on the side of the inlet opposite the inlet opening. The inlet opening and fire alarm device are thus located at distal ends of the tubular inlet. The spring is mounted on a collar on the side of the check valve facing the inlet opening. The collar runs along the inner surface of the inlet and points inwards. As a result, the spring can exert a force on the check valve acting in the longitudinal direction away from the inlet opening. When activated, this force, when the check valve is released, causes the check valve to move transversely along the longitudinal axis towards the fire alarm device and the sealing area is released by the check valve.However, this circumferential collar is responsible for the fact that, starting from the inlet opening behind this collar, a volume is created between the collar and the sealing area which cannot drain due to gravity. In order to enable gravity-driven drainage, it is proposed that the collar have a longitudinally running opening (e.g. groove), particularly in the area of the bottom of the tubular inlet facing the outlet. The opening has a base (e.g. groove base) which is in particular flush with the adjacent inner surface of the tubular inlet in the direction of the inlet opening or has a smaller radial distance than the tubular inlet to the inlet opening. The base can be flush with the adjacent inner surface of the tubular inlet in the direction of the sealing area or have a greater radial distance than the tubular inlet towards the sealing area.The base of the opening may extend longitudinally beyond the walls of the collar toward the sealing area. The base may form a step in the inner shell surface.

[0030] The opening walls extend radially inward. In the installed position, the longitudinal axis runs horizontally. The opening is particularly located in the area of the lowest point of the inner surface of the tubular inlet. The transverse axis then runs perpendicular to the vertical.

[0031] According to one embodiment, it is proposed that the opening span an arc angle of more than 1 degree and less than 45 degrees. The opening is provided in particular in the lower area of the inlet. A larger arc angle could result in the spring no longer having sufficient contact surface. A smaller arc angle could result in insufficient drainage.

[0032] The spring is mounted against the front end of the outlet, opposite the nozzle opening. In this case, the valve stem of the check valve is mounted so it can move parallel to the transverse axis. The spring pushes the valve stem toward the nozzle opening. When the check valve is released, the spring force moves the valve stem toward the nozzle opening. For this purpose, the spring is mounted on the side of the outlet opposite the nozzle opening and can thus exert a spring force.

[0033] The spring force acts on the valve stem in such a way that the valve stem is pressed against the fire alarm device and, when the fire alarm device is triggered, moves toward the fire alarm device. In the idle state, the fire alarm device exerts a counterforce to the spring force. In the activated state, this force is deactivated, and the valve stem can be moved toward the fire alarm device by the spring force.

[0034] According to one embodiment, it is proposed that the valve stem be mounted so that it can move along the longitudinal axis or along the transverse axis. This mounting is particularly suitable for transverse movement along the longitudinal axis or the transverse axis.

[0035] According to one embodiment, it is proposed that the sealing means seal an annular space between the valve stem and the tubular inlet or the tubular outlet. When the valve stem moves in the direction of the longitudinal axis, the sealing means is arranged at the tubular inlet. When the valve stem moves in the direction of the transverse axis, the sealing means is arranged at the tubular outlet. The sealing means is always arranged in the region of the transition between the inlet and outlet. This movement moves the sealing means into a region where it no longer seals the annular space, allowing extinguishing fluid to flow from the inlet to the outlet.

[0036] According to one embodiment, it is proposed that the cross-section of the tubular inlet be point-symmetrical to the longitudinal axis. It is also proposed that the cross-section of the tubular outlet be point-symmetrical to the transverse axis.

[0037] According to one embodiment, it is proposed that the nozzle opening be designed to accommodate a nozzle insert, in particular a fog nozzle insert. The nozzle opening can be designed, in particular, for a screw-in insert. A nozzle insert can be designed for the corresponding application and can be, for example, a fog nozzle or a sprinkler nozzle. This is preferably screwed into the nozzle opening and forms the end of the firefighting nozzle. The extinguishing fluid is discharged from the nozzle insert when activated.

[0038] According to one embodiment, it is proposed that the inlet opening be designed for placement on a mounting fitting of a distribution pipe. A mounting fitting can be, for example, a T-piece, a tapping clamp, a mounting clamp, or the like. In particular, the fire-fighting nozzle can be screwed onto it. Likewise, the nozzle can also be connected to the pipe network, for example, via press connectors.

[0039] According to one embodiment, it is proposed that the fire alarm device be a glass bulb. The glass bulb is loaded with a spring force by the spring and the valve stem. In the event of a fire, the glass bulb bursts, and the valve stem is released and moved toward the glass bulb by the spring force.

[0040] Another aspect is a firefighting system according to claim 10. Here, the firefighting nozzle is supplied with extinguishing fluid via a supply line. A nozzle insert is arranged within the firefighting nozzle. Another aspect is a firefighting method according to claim 11.

[0041] The subject matter is explained in more detail below using a drawing showing exemplary embodiments. The drawing shows: Fig. 1 shows a section along the longitudinal axis through a fire-fighting nozzle; Fig. 2a shows a detail of a drainage system; Fig. 2b shows a section through a groove; Fig. 3 shows section 3 according to Fig. 2b ; Fig. 4 a longitudinal section along the transverse axis through a fire-fighting nozzle.

[0042] Fig. 1shows a firefighting nozzle 2, which is connected to a mounting fitting 6 of a pipeline 8 via a tubular inlet 4. The firefighting nozzle 2 can be flooded with extinguishing fluid via the pipeline 8 in the event of activation.

[0043] The firefighting nozzle 2 is tightly screwed to the inlet 4 of the fitting 6 via a screw clamp 10. The inlet 4 has an inlet opening 4a. The inlet opening 4a is circumscribed by an inner surface 4b of the inlet 4. The inlet 4 extends along a longitudinal axis 12. In the installed state, the longitudinal axis 12 runs horizontally. A transverse axis 14 runs perpendicular to this longitudinal axis 12. In the installed state, the transverse axis 14 runs vertically.

[0044] The inlet 4 is connected to a tubular outlet 18 via a sealing area 16. The outlet 18 runs along the transverse axis 14. An outlet opening 18a is provided at the outlet 18. A nozzle insert 20 can be inserted, in particular screwed, into the outlet opening 18a.

[0045] In the sealing area 16, a circumferential seal 22 is arranged on a valve stem 24. A collar 26 is arranged on the inner circumferential surface 4b, remote from the inlet opening 4a, and points radially inward. A spring 28 is pivoted to this collar 26. The spring 28 is tensioned in the rest state. The spring 28 is held in the tensioned state by a glass bulb 30. The valve stem 24 is attached to the glass bulb 30.

[0046] The tubular inlet 4 extends between the inlet opening 4a and the collar 26 as well as between the collar 26 and the sealing area 16.

[0047] In the resting state, the pipe 8 is subjected to a resting pressure, which presses against the valve stem 24. This places pressure on the glass bulb 30.

[0048] If a fire occurs, the increased temperature causes the glass bulb 30 to burst, causing the spring 28 to push the valve stem 24 out of the inlet 4 in the direction of the longitudinal axis 12. The seal 22 of the sealing area 16 enters a free space 32, allowing air to escape past the seal 22 and out of the nozzle insert 20. Such a pressure loss is detected in the pipeline 8 and results in the pipeline 8 being flooded with an extinguishing fluid. The extinguishing fluid can then flow through the inlet 4 and the free space 32 to the nozzle insert 20 and be expelled there.

[0049] However, such activation only occurs at the nozzles 2 located directly above or in close proximity to the fire load. Nozzles located farther away do not trigger, as the glass bulb 30 does not burst.

[0050] Nevertheless, the pipeline 8 is flooded and extinguishing fluid also reaches the inlet 4a of non-activated nozzles 2, thus into the area between the collar 26 and the sealing area 16, in particular up to the seal 22.

[0051] After successful fire extinguishing, the pipeline 8 is emptied. To prevent extinguishing fluid from remaining in the nozzle 2, particularly between the inlet opening 4a and the seal 22, it is proposed that the radial distance 34c of the lateral surface 4b from the longitudinal axis 12 in the sealing area 16 be less than or equal to the radial distance 34a, b between the inlet opening 4a and the sealing area 16. This particularly also includes the collar 26, which represents a tapered inside diameter of the inlet 4a. A groove 36 is provided for this purpose in the collar 26. This is shown in more detail in Figure 2a.

[0052] Fig. 2ashows the inner circumferential surface 4b of the inlet 4. The collar 26 is provided on the inner circumferential surface 4b and is circumferential. The spring 28 is hinged to this collar 26. In the bottom area of the inlet 4a, however, the collar 26 is provided with a recess, thus a groove 36. The groove 36 is in the bottom area of the collar 26, particularly in the area of the collar 26 that points towards the nozzle outlet 18a. In the installed state, this is vertically downward. The groove bottom extends beyond the groove wall in the direction of the sealing area 16 and thus forms a recess on the inner circumferential surface 4b between the collar 26 and the sealing area 16.

[0053] Fig. 2bshows a longitudinal section of the collar 26. It can be seen that the radial distance 34a in the area of the inlet opening 4a is greater than the radial distance 34b in the area of the groove 26. Further towards the sealing area 16, the radial distance 34c becomes even smaller. The radial distance 34c is the smallest of all radial distances 34 there. The groove 26 extends with its radial distance 34b in the longitudinal direction 12 toward the sealing area 16 and forms a step on the lateral surface 4b.

[0054] This makes it possible to completely empty a non-activated nozzle 2 after the fire has been extinguished. The longitudinal axis 12 runs horizontally. Because the radial distance 34c, starting from the sealing area 16, through the radial distance 34b in the region of the groove to the radial distance 34a at the inlet opening 4a, remains at least constant, but preferably increases, extinguishing fluid can flow out of the inlet opening 4a by gravity.

[0055] The groove 36 is shown again in the section according to Fig. 3 There it can be seen that the radial distance 34c behind the plane of the drawing is always smaller than any radial distance 34b, a in the direction of the plane of the drawing.

[0056] It is also possible to mount the valve stem 24 in the outlet 18 along the transverse axis 14, as in Fig. 4 shown. The spring 28 allows the valve stem 24 to be moved toward the glass bulb 30, allowing the seal 22 to enter the free space 32 and be surrounded by extinguishing fluid. However, this also ensures that a radial distance 34 from the longitudinal axis 12 in the sealing area 16 is smaller than any radial distance 34 between the sealing area 16 and the inlet opening 4a.

[0057] Using the nozzle shown, a dry-stressed system can be protected from frost damage even after it has been activated.

[0058] The invention can be described in more detail with reference to several embodiments. One embodiment 1 relates to a fire-fighting nozzle with a tubular inlet with an inlet opening, wherein the inlet extends along a longitudinal axis from the inlet opening in the direction of a check valve, a tubular outlet with at least one nozzle opening, wherein the outlet extends along a transverse axis running transversely to the longitudinal axis towards the nozzle opening, wherein the check valve is arranged between the inlet and the nozzle opening and seals the outlet in a sealing region with respect to the inlet, characterized in that a radial distance of the sealing region from the longitudinal axis is less than or equal to a smallest radial distance of the inner circumferential surface of the inlet opening from the longitudinal axis in a region between the inlet opening and the sealing region.

[0059] Embodiment 2 relates to a fire-fighting nozzle according to embodiment 1, characterized in that that a spring acts on a valve stem of the shut-off valve.

[0060] Embodiment 3 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that that the spring is mounted against a radially inward-facing collar on the tubular inlet.

[0061] Embodiment 4 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that the collar has an opening running parallel to the longitudinal axis, in particular in the region of the bottom of the inlet facing the outlet.

[0062] Embodiment 5 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that that the opening has an arc angle of more than 1° and less than 45°.

[0063] Embodiment 6 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that that the spring is mounted against a frontal base of the outlet opposite the nozzle opening.

[0064] Embodiment 7 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that that a spring force of the spring acts on the valve stem in such a way that the valve stem is pressed against a fire alarm device and is moved in the direction of the fire alarm device when the fire alarm device is triggered.

[0065] Embodiment 8 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that that the valve stem is mounted so as to be movable in the direction of the longitudinal axis or in the direction of the transverse axis.

[0066] Embodiment 9 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that the sealant seals an annular space between the valve stem and the tubular inlet or the tubular outlet.

[0067] Embodiment 10 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that that the cross-section of the inlet is point-symmetrical to the longitudinal axis.

[0068] Embodiment 111 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that that the cross-section of the outlet is point-symmetrical to the transverse axis.

[0069] Embodiment 12 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that that the nozzle opening is designed to receive a nozzle insert, in particular to receive a mist nozzle insert.

[0070] Embodiment 13 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that that the inlet opening is designed for arrangement on a fastening fitting of a distribution pipe.

[0071] Embodiment 14 relates to a fire-fighting nozzle according to one of the preceding embodiments, characterized in that that the fire alarm device is a glass vessel.

[0072] Embodiment 15 relates to a firefighting system having a supply line, at least one firefighting nozzle according to one of the preceding embodiments connected to the supply line, and a nozzle insert arranged in the firefighting nozzle.

[0073] Embodiment 16 relates to a method for operating a fire fighting system according to one of the preceding embodiments, in which In the event of a fire, a dry-prestressed supply line is first flooded with extinguishing fluid, and the supply line is emptied after the fire has been extinguished, whereby the extinguishing fluid flows completely out of the area between the inlet opening and the sealing area via the inner surface of the inlet opening. List of reference symbols

[0074] 2 Firefighting nozzle 4 Inlet 4a Inlet opening 4b Inner shell surface 6 Fitting 8 Pipe 10 Clamp 12 Longitudinal axis 14 Transverse axis 16 Sealing area 18 Outlet 18a Nozzle outlet 20 Nozzle insert 22 Seal 24 Valve stem 26 Collar 28 Spring 30 Glass bulb 32 Clearance 34 Radial distance 36 Groove

Claims

1. Fire-fighting nozzle (2) with - a tubular inlet (4) having an inlet opening (4a), said inlet (4) extending along a longitudinal axis (12) from said inlet opening (4a) toward a shut-off valve, - a tubular outlet (18) having at least one nozzle opening, the outlet (18) extending along a transverse axis (14) transverse to the longitudinal axis (12) toward the nozzle opening, - wherein the shut-off valve is arranged between the inlet (4) and the nozzle opening and seals the outlet (4) in a sealing region (16) relative to the inlet (4), wherein - a radial distance (34) of the sealing region (16) from the longitudinal axis (12) is smaller than or equal to a smallest radial distance of the inner lateral surface (4b) of the inlet opening (4a) from the longitudinal axis (12) in a region between the inlet opening (4a) and the sealing region (16) characterized in that - a spring (28) acts on a valve stem (24) of the shut-off valve - the spring (28) is mounted against a front-face base of the outlet (18) arranged opposite the outlet (18), - a spring force of the spring (28) acts on the valve stem (24) in such a way that the valve stem (24) is pressed against a fire detection means and is moved in the direction of the fire detection means when the fire detection means is triggered, and - the valve stem (24) is mounted so as to be movable in the direction of the transverse axis (14).

2. Fire-fighting nozzle according claim 1, characterized in that - the collar (26) has an opening extending parallel to the longitudinal axis (12), wherein the opening is located in the region of the lowest point of the inner surface (4b) of the tubular inlet (4).

3. Fire-fighting nozzle according to claim 2, characterized in that - that the opening spans an arc angle of more than 1° and less than 45°.

4. Fire-fighting nozzle according to any one of the preceding claims, characterized in that - the sealing means seals an annular space between the valve stem (24) and the tubular inlet (4) or the tubular outlet (18).

5. Fire-fighting nozzle according to any one of the preceding claims, characterized in that - the cross-section of the inlet (4) is point-symmetrical with respect to the longitudinal axis (12).

6. Fire-fighting nozzle according to any of the preceding claims, characterized in that - the cross-section of the outlet (18) is point-symmetrical to the transverse axis (14).

7. Fire-fighting nozzle according to any of the preceding claims, characterized in that - the nozzle opening is formed for receiving a nozzle insert (20), in particular for receiving a fog nozzle insert.

8. Fire-fighting nozzle according to one of the preceding claims, characterized in that - the inlet opening (4a) is formed for arrangement on a mounting fitting of a distribution pipe.

9. Fire-fighting nozzle according to any one of the preceding claims, characterized in that - the fire detection means is a glass barrel (30).

10. Fire-fighting system comprising a supply line, at least one fire-fighting nozzle connected to the supply line according to any one of claims 1 to 9, and a nozzle insert (20) arranged in the fire-fighting nozzle.

11. A method of operating a fire-fighting system according to claim 10, wherein - a dry-biased supply line is initially flooded with extinguishing fluid in a fire event, and - the supply line is drained after the fire has been extinguished, the extinguishing fluid flowing completely out of the area (4a) between the inlet opening (4a) and the sealing area (16) via the inlet opening's (4a) inner circumferential surface (4b).

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