JP2019201687A - Firefighting equipment - Google Patents

Abstract

To provide firefighting equipment in which a relief mechanism from secondary piping to primary piping is installed, and, in a case of a fire, a pump is started without delay.SOLUTION: Firefighting equipment includes: a pump P for sending water of a water source W to piping; a water flow detection device 3 connected to the pump P by piping; a sprinkler head S connected to secondary piping 2 of the water flow detection device 3; and a pump starting switch 5 installed to primary piping 1 of the water flow detection device 3. The water flow detection device 3 is provided in a plurality of numbers for each protection area, and the primary piping 1 continues to the pump P. A relief valve 4 installed on bypass piping that bypasses the primary side and the secondary side of the water flow detection device 3 is opened when a difference in pressure between the primary side and the secondary side is a predetermined value or more. A motor-operated valve 6 is installed on the primary piping 1 branched for each protection area. When the water flow detection device 3 in a protection area where a fire occurs is operated, the motor-operated valves 6 in the other protection areas are closed.SELECTED DRAWING: Figure 1

Description

The present invention relates to fire extinguishing equipment such as sprinkler equipment and foam fire extinguishing equipment.

  In fire-extinguishing equipment such as sprinkler equipment and foam fire-extinguishing equipment, a water flow detector is installed on a pipe that extends from a water source to a sprinkler head (or foam head). The water flow detection device has a check valve structure and allows only one-way water flow from the water source to the sprinkler head. The secondary pipe where the sprinkler head is installed expands and contracts due to seasonal temperature differences. Especially in the summer, the water in the secondary side pipe expands and the pressure increases, and the sprinkler head may be damaged. In winter, when the volume expands due to freezing of water in the secondary side pipe, the water in the pipe is compressed and the pressure rises, and damage similar to the above may occur.

On the other hand, in patent document 1, the bypass flow path which bypasses the primary side and secondary side of a flowing water detection apparatus is installed, and the differential pressure | voltage valve is installed on the bypass flow path. The differential pressure valve opens when the pressure on the secondary side becomes higher than the pressure on the primary side, and allows water to escape from the secondary side pipe to the primary side pipe to prevent damage to the sprinkler head.

JP-A-8-131574

  When a fire occurs in the fire extinguishing equipment of FIG. 1 having a relief mechanism such as the above-described differential pressure valve, the sprinkler head S operates to discharge water in the secondary side pipe 2a. Thereby, the pressure of the secondary side pipe 2a falls below the pressure of the primary side pipe 1, the valve body of the flowing water detector 3a is opened, and an operation signal is output. When the flowing water detector 3a is opened, the water in the primary side pipe 1 is supplied to the secondary side pipe 2a, and the pressure in the primary side pipe 1 is reduced.

  Since the primary side pipe 1 is also connected to the flowing water detection devices 3b and 3c of other systems, the primary side pipe 1 and the secondary side pipes 2b and 2c in the relief valves 4b and 4c of the system where no fire has occurred. Differential pressure is generated. When this differential pressure exceeds a predetermined value, the relief valves 4b and 4c of the non-fire system are opened, and water flows from the secondary side pipes 2b and 2c of the non-fire system to the primary side pipe 1.

  By supplying water from the secondary side pipes 2b and 2c of the non-fire system to the primary side pipe 1, the pressure drop in the primary side pipe 1 becomes slow, and the pump start switch 5 installed in the primary side pipe 1 It may take time to reach the specified operating pressure. As a result, although the sprinkler head S operates, there is a possibility that the initial fire extinguishing may be hindered due to insufficient water supply.

  Therefore, in view of the above problems, the present invention aims to provide a fire extinguishing facility in which a pump is started without delay in the event of a fire in a fire extinguishing facility in which a relief mechanism from a secondary side pipe to a primary side pipe is installed. Yes.

In order to achieve the above object, the present invention provides the following fire extinguishing equipment.
That is, a pump that feeds water from the water source to the pipe, a running water detector connected by the pump and the pipe, a sprinkler head connected to the secondary pipe of the running water detector, and a primary pipe of the running water detector There are installed pump start switches, multiple water flow detectors are installed for each protection area, and the primary piping continues to the pump, on the bypass piping that bypasses the primary and secondary sides of the water flow detector. The relief valve installed in is opened when the pressure difference on the secondary side with respect to the pressure on the primary side is greater than or equal to a predetermined value, and an electric valve is installed on the primary side pipe branched for each protection area, It is a fire extinguishing facility that closes the motorized valves in other protection areas when the water flow detection device in the protection area where a fire has occurred is activated.

  According to the above, the relief valve in the protection area where no fire has occurred is opened by closing the motor-operated valve installed on the primary piping excluding the protection area that output the activation signal in the event of a fire. Can be configured not to. The same effect can be obtained even if the motor-operated valve is installed on the primary side pipe branched for each protection area or on the outlet side of the relief valve on the bypass pipe.

The motor-operated valve may be completely closed by a closing operation, or may be in a slightly open state or a half-open state so that a certain amount of water can be passed on the assumption that a fire may occur in another protection area. . When the motorized valve is slightly open or half open, the relief valve in the protection area where no fire has occurred is opened and water is supplied from the secondary side piping to the primary side piping, but the amount of inflow to the primary side piping is reduced. Can be suppressed. In addition, when the water valve installed in the same protection region outputs an operation signal when the motor-operated valve is in a slightly open or half-open state within one protection region, the motor-operated valve returns to the open state.

As described above, according to the present invention, in the fire extinguishing equipment provided with the relief mechanism from the secondary side pipe to the primary side pipe, the motor-operated valve installed on the primary side of the non-fire protection area is closed in the event of a fire. By operating and not opening the relief valve in the non-fire protection area, it is possible to realize a fire extinguishing facility in which the pump is started without delay.

The piping system figure of the sprinkler equipment to which this invention is applied. The front view of a flowing water detection apparatus. The top view of a flowing water detection apparatus. The front view of the state which removed the cover of the flowing water detection apparatus. Sectional drawing of a relief valve. The piping system figure of the foam fire extinguishing equipment to which this invention is applied.

  The present invention will be described below with reference to the drawings. The fire extinguishing equipment shown in FIG. 1 is a sprinkler equipment, and includes a water source W, a pump P, a primary side pipe 1, a secondary side pipe 2, a flowing water detector 3, and a sprinkler head S.

  The water source W is a water tank in which water used for fire extinguishing is stored, and is generally installed in the basement of a building. A pump P is installed in the vicinity of the water source W, and the water from the water source W can be sent to the primary pipe 1 by the pump P.

  A flowing water detection device 3 is installed in the primary side pipe 1. The flowing water detection device 3 is installed for each protection area, so that the primary pipe 1 is branched in the middle, and the flowing water detection devices 3a, 3b, and 3c are installed on the branch pipes, respectively. In addition, an electrically operated valve 6 (6a, 6b, 6c) that is always open is installed between the branched primary side pipe 1 and the flowing water detection device 3. The flowing water detection device 3 and the motor-operated valve 6 are electrically connected to the control device C.

  A pressure tank T is installed between the flowing water detector 3 and the pump P, and a pump start switch 5 is installed in the pressure tank T. The pump activation switch 5 is activated to activate the pump P when the pressure in the primary side pipe 1 becomes a predetermined pressure or less. In the present embodiment, the set pressure of the pump start switch 5 is 0.6 MPa.

  The flowing water detection device 3 shown in FIGS. 2 to 4 includes a valve body 32 having a swing check structure inside a cylindrical main body 31. The valve body 32 has a disk shape and is normally closed, and allows only water to flow from the primary side pipe 1 to the secondary side pipe 2. The flowing water detection device 3 is a working valve type flowing water detection device that detects a displacement due to opening of the valve body 32 and outputs a signal. Specifically, the stem 32a connected to the flowing water detection mechanism 31b installed outside the main body 31 is displaced with the opening operation of the valve body 32, and the displacement is provided in a limit switch (illustrated) in the flowing water detection mechanism 31b. )) And output a signal. As an example of the flowing water detection apparatus having such a structure, there are those described in Japanese Patent Application Laid-Open No. 2010-5429 and Japanese Patent Application Laid-Open No. 2016-135451. Here, a detailed description of the structure of the flowing water detection device 3 is omitted.

  The flowing water detection device 3 is provided with an opening covered by a cover 31a on the front side. A flowing water detection mechanism 31b is disposed on one side surface of the flowing water detection device 3, and a drain valve 31c is disposed on the other side surface.

  Pipings 34 and 35 are installed on the front side of the main body 31. The pipe 34 is connected to a hole 34 a provided on the primary pipe 1 side of the valve body 32 in the main body 31, and the pipe 35 is a hole provided on the secondary pipe 2 side of the valve body 32 in the main body 31. 35a. The ends of the pipes 34 and 35 are connected to a three-way joint 36, and a pressure gauge 33 is installed at the upper connection port of the three-way joint 36 in the drawing. The left connection port of the three-way joint 36 is connected to a pipe 37 bent in a U shape. The pipe 34 through the pipe 37 to the pipe 35 is a bypass pipe.

  The bypass pipe may be installed in the main body 31 of the flowing water detection device 3 as described above, or can be configured by directly connecting the pipe 34 and the primary side pipe 1 and the pipe 35 and the secondary side pipe 2. In addition, the above-described electric valve 6 can be installed on the bypass pipe, and in this case, the electric valve 6 can be installed between the relief valve 4 and the pipe 34.

  A relief valve 4 is installed between one end of the pipe 37 and one of the three-way joints 36. The relief valve 4 can pass water from the secondary side pipe 2 to the primary side pipe 1, and the valve body 41 installed in the cylindrical main body 40 is urged to the valve seat 43 by a spring 42. The valve body 41 is always closed.

  The body 40 of the relief valve 4 has an end on the side where the valve seat 43 is installed continues to the pipe 35 (secondary side pipe 2), and an end on the side where the cylindrical holder 44 is installed is the pipe 34 ( It continues to the primary pipe 1). The main body 40 is disposed at a position that intersects the flow direction of the flowing water detection device 3 (from the bottom to the top in FIGS. 2 and 4). With such a configuration, the main body 40 can be installed horizontally in the drawing. In particular, since the working valve type flowing water detection device 3 generally has a narrow face-to-face dimension, the relief valve 4 can be installed on the bypass pipe installed in the main body 31 by the above configuration.

  The spring 42 is installed between the valve body 41 and the holder 44. The spring 42 has a pressure of the secondary side pipe 2 applied to the valve body 41 when the pressure of the pipe 35 (secondary side pipe 2) exceeds the pressure of the pipe 34 (primary side pipe 1) by about 0.3 to 0.4 MPa. The valve body 41 is opened by contracting.

  The force acting on the valve body 41 by the spring 42 can be adjusted by the position of the holder 44. As described above, the valve body 41 opens when the differential pressure between the pressure of the primary side pipe 1 and the pressure of the secondary side pipe 2 exceeds a predetermined value. As a case where differential pressure occurs, in the state where the valve body 41 is closed, the fluid pressure on the inflow side (secondary side pipe 2) rises and a difference from the fluid pressure on the outflow side (primary side pipe 1) occurs. There are two states: a state in which the fluid pressure on the outflow side (primary side pipe 1) drops and a difference occurs between the fluid pressure on the inflow side (secondary side pipe 2). In any case, the valve element 41 does not open with a slight differential pressure, and the spring element 42 presses and holds the valve element 41 against the valve seat 43 so that the valve element 41 is released after a certain pressure difference is generated. doing.

  Specifically, when the maximum working pressure of the flowing water detection device 3 is 1.4 MPa and the pressure of the water filled in the secondary side pipe 2 is 1 MPa, before the maximum working pressure of the flowing water detection device 3 is exceeded. In order to open the valve body 41 at the stage, the valve body 41 is set to open before the differential pressure reaches 0.4 MPa. Preferably, the differential pressure is set in the range of 0.15 MPa to 0.4 MPa. In the present embodiment, the valve body 41 is set to open when the differential pressure is in the range of 0.3 MPa to 0.4 MPa.

  The valve seat 43 has a cylindrical shape, and a fluororesin is used as a material. The material of the O-ring 45 installed on the valve body 41 that contacts the valve seat 43 is fluororubber. As a result, the valve body 41 and the valve seat 43 which are closed for a long period of time are prevented from sticking. As a material for the valve seat 43, it is also possible to use a metal valve seat 43 whose surface is coated with a fluororesin in addition to the fluororesin. Alternatively, only the surface in contact with the valve body 41 may be coated with a fluororesin.

  The inside of the valve seat 43 is a hole. In the relief valve 4, the cross-sectional area of the hole inside the valve member 43 is “the cross-sectional area of the minimum flow diameter portion”, which is a fluid on a virtual plane that intersects perpendicularly to the central axis of the main body 40 of the relief valve 4. This is the part where the cross-sectional area of the part through which can pass is minimized.

  The holder 44 has a male screw on the outer peripheral surface that is screwed with a female screw installed on the inner peripheral surface of the main body 40. Accordingly, the position of the holder 44 can be changed, and the force with which the spring 42 presses the valve body 41 can be adjusted. The holder 44 is provided with a center hole 46 and a plurality of circulation holes 47 formed around the center hole 46. In this embodiment, four circulation holes 47 are installed.

  A valve rod 41 a extending from the valve body 41 toward the holder 44 is inserted into the center hole 46. The center hole 64 has a function of guiding the valve stem 41a when the valve body 41 is opened and closed. When the valve body 41 is opened, the water filled in the secondary side pipe 2 passes through the flow hole 47 and flows into the primary side pipe 1.

  The sprinkler head S is installed in the secondary pipe 2 and automatically operates upon detecting the heat of the fire. The structure of the sprinkler head S is known, and detailed description of the internal structure is omitted here. The sprinkler head S has a nozzle connected to the secondary side pipe 2 inside, and the diameter of the outlet side of the nozzle is set so that the water discharge amount is 80 L / min. The outlet of the nozzle is always closed by a valve, and the valve is supported by a thermal decomposition part. The thermal decomposition part is activated by the heat of the fire, and examples of the thermal decomposition part are described in JP-A-7-284545 and JP-A-2015-37678.

  Here, the cross-sectional area of the minimum flow port of the relief valve 4 is smaller than the cross-sectional area of the outlet of the nozzle of the sprinkler head S, and the cross-sectional area of the nozzle outlet of the sprinkler head S and the cross-sectional area of the minimum flow port of the relief valve 4. The ratio is set to 1: 0.3 or less. If the value of this ratio becomes too small, dust is likely to be clogged inside the relief valve 4, so that the ratio is more preferably in the range of 0.2 to 0.03.

  Further, in the relief valve 4 described above, the inner hole of the valve seat 43 has the cross-sectional area of the minimum flow port portion, but the sum of the cross-sectional areas of all the flow holes 47 (four places) of the holder 44 is more than this. When this is smaller, the sum of the cross-sectional areas of the flow holes 47 becomes the cross-sectional area of the minimum flow diameter portion.

  Next, the operation | movement at the time of the fire in the fire extinguishing equipment of the said structure is demonstrated.

  In the fire extinguishing equipment shown in FIG. 1, the pressure of the secondary side pipe 2 is set higher than the pressure of the primary side pipe 1 during normal times (when no fire occurs). For example, when the pressure of the secondary side pipe 2 is 1 MPa, the pressure of the primary side pipe 1 is set to 0.8 MPa, which is lower than that. The operating pressure of the pump start switch 5 is 0.6 MPa as described above.

  When a fire occurs in the protection area of the flowing water detection device 3a, the sprinkler head S connected to the secondary pipe 2a of the flowing water detection device 3a is activated. The nozzle 61 of the activated sprinkler head S is opened, and the water filled in the secondary side pipe 2a is sprayed into the room, so that the pressure in the secondary side pipe 2a decreases.

  Due to the decompression of the secondary side pipe 2a, the valve body 32 of the flowing water detection device 3a is opened and water is supplied from the primary side pipe 1 to the secondary side pipe 2. Moreover, the flowing water detection device 3a outputs an operation signal by the opening operation of the valve body 32. The control device C that has received the operation signal closes the motor-operated valves 6b and 6c installed in the protection area where no fire has occurred. As a result, the motor-operated valve 6 is closed and the valve element 41 of the relief valves 4b and 4c in the non-fire section is prevented from being opened when the pressure of the primary side pipe 1 becomes lower than 0.7 MPa.

  When the pressure of the primary side pipe reaches 0.6 MPa, the pump start switch 5 is activated and the pump P is started. Water from the water source W is continuously sent from the pump P, and a sufficient amount of water is sprayed from the activated sprinkler head S to suppress the fire.

In the above description, when the electric valve 6 is slightly opened or half-opened when the flowing water detection device 3a outputs an operation signal, the relief valves 4b and 4c in the non-fire section are generated when the pressure of the primary side pipe 1 becomes lower than 0.7 MPa. However, since the amount of flowing water supplied from the secondary side pipes 2b and 2c to the primary side pipe 1 is smaller than the amount of flowing water discharged from the activated sprinkler head S, the primary side pipe 1 is further Reduce pressure. As a result, the pump start switch 5 operates without delay and the pump P is started.

  Then, the structure of the fire-extinguishing equipment of this invention other than having demonstrated above is demonstrated.

  In the primary pipe 1, an auxiliary pressurizing pump 7 is installed between the pump P and the flowing water detection device 3. The auxiliary pressurizing pump 7 has a smaller discharge amount than the pump P described above, and requires less power for operation. For example, the primary side in a non-fire situation in which the pressure in the secondary pipe 2 decreases in winter and the valve body 32 of the flowing water detection device 3 opens in a small amount and is filled from the primary pipe 1 to the secondary pipe 2. An auxiliary pressurizing pump 7 is used when the piping 1 is depressurized. When the pressure of the primary side pipe 1 at the start of the pump P is set to 0.6 MPa and the pressure of the primary side pipe 1 at which the auxiliary pressurizing pump 7 is started is set to 0.7 MPa, before the pump P is started The auxiliary pressurizing pump 7 is activated to supply water, and the reduced pressure in the pipe is recovered. In addition, the amount of flowing water when the relief valve 4 is opened is smaller than the discharge amount of the auxiliary pressurizing pump 7.

  Regarding the auxiliary pressurizing pump 7, the pressure difference when the relief valve is opened than the difference between the water pressure in the secondary side pipe at normal time and the water pressure in the primary side pipe when the auxiliary pressurizing pump is operated. Is set to be larger. More specifically, when the pressure of water in the secondary side pipe 2 is 1 MPa and the starting pressure of the auxiliary pressurizing pump 7 is 0.7 MPa, the differential pressure is 0.3 MPa, and the relief valve described above It is smaller than the differential pressure (0.3 to 0.4 MPa) when 4 opens. For this reason, when the water in the primary side piping 1 leaks and depressurizes at the time of non-fire, the auxiliary pressurization pump 7 is started and water is supplied from the water source W to the primary side piping 1. The auxiliary pressurizing pump 7 stops operation when the primary side pipe 1 reaches a predetermined pressure. Thus, even if a leak occurs from the primary side pipe 1 at the time of non-fire, the relief valve 4 does not open.

  In the primary side pipe 1, a safety valve 8 is installed between the pump P and the flowing water detection device 3. The safety valve 8 has a function of releasing water in the primary side pipe 1 to the outside when the pressure in the primary side pipe 1 becomes too high and exceeds a predetermined pressure. The pressure at which the safety valve 8 opens is set to a value higher than the pressure at which the auxiliary pressurizing pump 7 operates.

  On the other hand, some buildings such as large warehouses and factories have a folded-plate roof structure. Folded plate roofs have the advantage that folded plates made of metal are lightweight and inexpensive and require a shorter construction period. However, after the building is completed, the outside temperature such as the summer heat and the winter cold Easy to receive heat from. For this reason, the water inside the secondary side pipe 2 disposed near the attic of the folded-plate roof is abnormally pressurized in the summer, or the sprinkler head S is easily damaged in the winter, easily freezing. According to the present invention, it is possible to prevent the sprinkler head S from being damaged due to abnormal pressure rise or freezing of water in the secondary side pipe 2 arranged near the folded plate roof, and the start of the pump P is not delayed in the event of a fire. It can be done and extinguishes quickly.

  In the embodiment described above, the sprinkler facility has been described as an example. However, the present invention is also applicable to a foam fire extinguishing facility in which a chemical is contained in the fire extinguishing water. As shown in FIG. 6, the foam fire extinguishing equipment is provided with a chemical tank 9a and a mixer 9b. When the sprinkler head S is activated and the pump P is activated in the event of a fire, the chemical (foam concentrate) in the chemical tank 9a is mixed. The foam aqueous solution that is sent to 9b and mixed with water from the water source W at a predetermined ratio is sent to the flowing water detection device 3. The foam aqueous solution that has passed through the simultaneous opening valve 9c through the flowing water detection device 3 is sprayed from the foam head 9d.

  In particular, since the foam fire-extinguishing equipment is installed in a parking lot, all or part of the secondary side pipe 2 may be installed outdoors. According to the present invention, the sprinkler head S (sensing head) and the simultaneous release valve 9c installed on the secondary side (secondary side pipe 2) of the water flow detection device in the foam fire extinguishing equipment are abnormally boosted in the water inside the secondary side pipe. And can be prevented from being damaged by freezing. Furthermore, in the event of a fire, the pump P is started without delay and can be extinguished quickly. The relief valve 4 described above is installed in a sensing line pipe connected to the simultaneous opening valve 9c and where the sprinkler head S is installed, and a pipe (not shown) that bypasses the primary side piping of the simultaneous opening valve 9c. Is also possible.

  The fire extinguishing equipment shown in FIGS. 1 and 6 is provided with a control device C, and a flowing water detection device 3, a pump start switch 5, a motor operated valve 6, a pump P, and an auxiliary pressurizing pump 7 are electrically connected. . In the figure, the control device C is shown in only one place, but other than this, it can be separately installed in the vicinity of components such as the pump P and the auxiliary pressurizing pump 7. Depending on the setting of the control device C, the pump P can be started immediately after the operation signal of the flowing water detection device 3 is output.

The fire extinguishing equipment includes a pump for supplying water from a water source to a pipe, a flowing water detection device connected by the pump and the piping, and a sprinkler head connected to a secondary side pipe of the flowing water detection device. A number of water flow detectors are installed in each protection area, and the primary pipe is connected to the pump. The pump is activated by the operation signal of the water flow detector and bypasses the primary and secondary sides of the water flow detector. The relief valve installed in the valve is opened when the pressure difference on the secondary side with respect to the pressure on the primary side exceeds a predetermined value, and the sectional area of the minimum flow port of the relief valve is larger than the sectional area of the nozzle outlet of the sprinkler head. Configured to be small.

1 Primary piping
2 (2a, 2b, 2c) Secondary piping
3 (3a, 3b, 3c) Flowing water detection device
4 (4a, 4b, 4c) relief valve
5 Pump start switch
6 (6a, 6b, 6c) Motorized valve
7 Auxiliary pressurizing pump
8 Safety valve
9a Drug tank
9b mixer
9c Simultaneous release valve
9d foam head
31 Main body of the running water detector
32 Valve body of flowing water detector
33 Pressure gauge
34, 35, 37 piping
36 Three-way fittings
40 Relief valve body
41 Relief valve disc
42 Spring
43 Valve seat
44 holder
P pump
S sprinkler head
T pressure tank
W Water source

Claims (15)

A pump that feeds water from the water source to the pipe;
A running water detector connected to the pump by piping;
A sprinkler head connected to the secondary pipe of the water flow detector;
And a pump start switch installed in the primary pipe of the running water detector,
A number of water flow detectors are installed in each protection area, and the primary piping continues to the pump.
The relief valve installed on the bypass pipe that bypasses the primary and secondary sides of the water flow detector opens when the pressure difference on the secondary side exceeds the primary pressure, and branches for each protection area. A fire extinguishing system is characterized in that a motorized valve is installed on the primary side pipe, and when the water flow detection device in the protected area where the fire has occurred is activated, the motorized valve in the other protected area is closed. The fire extinguishing equipment according to claim 1, wherein the motor-operated valve is installed on the outflow side of the relief valve on the bypass pipe. The fire-extinguishing equipment according to claim 1 or 2, wherein when the motor-operated valve is closed, the valve body of the motor-operated valve is slightly opened or half-opened. The fire extinguishing equipment according to claim 3, wherein when the motor-operated valve is slightly opened or half-opened in one protection region, the motor-operated valve is opened by an operation signal of a flowing water detection device in the same protection region. The fire extinguishing equipment according to any one of claims 1 to 4, wherein a cross-sectional area of a minimum flow port portion of the relief valve is smaller than a cross-sectional area of a nozzle outlet of the sprinkler head. The fire-extinguishing equipment according to any one of claims 1 to 5, wherein the relief valve is opened before a difference in pressure in the secondary side pipe with respect to pressure in the primary side pipe reaches 0.4 MPa. The relief valve according to any one of claims 1 to 6, wherein the relief valve is installed on a bypass pipe installed in a main body of the flowing water detection device. The fire extinguishing equipment according to any one of claims 1 to 7, wherein the relief valve is disposed at a position intersecting with a flow direction of the flowing water detection device. 9. The flowing water detection device according to any one of claims 1 to 8, wherein the valve body installed therein has a swing check structure, and is a working valve type that detects a displacement caused by opening of the valve body and outputs a signal. Fire extinguishing equipment. The fire extinguishing equipment according to any one of claims 1 to 9, wherein the pressure inside the secondary side pipe is set higher than the pressure inside the primary side pipe during normal times. The fire extinguishing system according to any one of claims 1 to 10, wherein a safety valve is provided on the primary side pipe to discharge water in the primary side pipe to the outside when the primary side pipe exceeds a predetermined pressure. Facility. The auxiliary pressure pump is installed on the primary side pipe, and the flowing water amount when the relief valve is opened is smaller than the discharge amount of the auxiliary pressure pump. Fire extinguishing equipment. The fire extinguishing equipment according to any one of claims 1 to 12, wherein the secondary side pipe is installed near the folded plate roof. The fire-extinguishing equipment according to any one of claims 1 to 13, wherein the secondary-side piping is installed in a place where all or part of the secondary-side piping is exposed to outside air. When the relief valve opens, the difference between the water pressure in the secondary pipe at normal time and the water pressure in the primary pipe when the auxiliary pressure pump installed on the primary pipe is activated The fire extinguishing equipment according to claim 1, wherein the pressure difference is larger.

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