Open-type sprinkler system and history-keeping valve

Abstract

To facilitate cause investigation for a malfunction by holding operations of a start valve up to an opening operation of a deluge valve as a history.SOLUTION: An open type sprinkler facility includes: an open type sprinkler head 42 for sprinkling water for fire extinguishment to a protection area 11; a decompression type deluge valve 28 as a deluge valve, in which a branch pipe 22 connected to a water source of water for fire extinguishment is connected to a primary side, a fire extinguishing pipe 30 connected to the open type sprinkler head 42 is connected to a secondary side, and a control pipe 34 is connected to a control port 2810 for opening / closing operations; and a manual start valve 48 provided in the control pipe 34 as a start valve for opening the decompression type deluge valve 28 by executing an opening operation. An opening operation is made by pressure change between the control pipes connected to the primary side and the secondary side when the manual start valve 48 performs an opening operation. A history holding valve 50 for holding the state that the opening operation has been made as a history is provided in the control pipe 34 in series to the manual start valve 48.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an open sprinkler facility and a history retention valve that extinguish a fire by spraying fire extinguishing water from an open sprinkler head in response to the opening operation of a start valve. relates to

Background Art

[0002] Conventionally, open sprinkler facilities have been installed in places where fires spread rapidly, such as on the stages of theaters.

[0003] In an open sprinkler facility, a water supply pipe from a fire pump facility is connected to the primary side of a simultaneous opening valve, and a fire extinguishing pipe from the secondary side of the simultaneous opening valve is led to a protected area, and an open sprinkler head is connected to the fire extinguishing pipe. A manual start valve is provided at a location led to the protected area in the control pipe of the simultaneous opening valve, and an automatic start valve that operates by the activation of a fire detector installed in the protected area is provided outside the protected area. In the normal operation state of the open sprinkler facility, the water supply pipe on the primary side of the simultaneous opening valve is filled with fire extinguishing water in a pressurized state, and the fire extinguishing pipe on the secondary side of the simultaneous opening valve connected to the open sprinkler head is an empty pipe not filled with fire extinguishing water.

[0004] When a fire occurs, the fire detector operates, and the monitoring panel causes the automatic start valve to open by a signal from the fire receiver, so that the simultaneous opening valve opens and fire extinguishing water is sprayed from the open sprinkler head. Also, when the manual opening valve provided in the protected area is activated (opened), the simultaneous opening valve opens and fire extinguishing water is sprayed from the open sprinkler head.

[0005] Furthermore, there are two types of simultaneous release valves: pressure-reducing and pressurizing. In a pressure-reducing simultaneous release valve, the valve body is kept in the closed position by filling the control piping connected to the pressure-reducing simultaneous release valve with pressurized fire extinguishing water. When the automatic or manual activation valve is opened, the fire extinguishing water in the control piping is drained, reducing the pressure and moving the valve body to the open position, thus opening the simultaneous release valve. On the other hand, in a pressurizing simultaneous release valve, the valve body is kept in the closed position by draining the fire extinguishing water from the control piping connected to the pressure-reducing simultaneous release valve, reducing the pressure and moving the valve body to the open position when the automatic or manual activation valve is opened, supplying fire extinguishing water to the control piping and pressurizing it, thus opening the simultaneous release valve. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2012-179330 [Patent Document 2] Japanese Patent Publication No. 2006-345883 [Patent Document 3] Japanese Patent Publication No. 2012-095897 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, with conventional open-type sprinkler systems, malfunctions can occur for various reasons, causing firefighting water to be sprayed from the open sprinkler heads, resulting in injuries to people and water damage to equipment in protected areas such as the stage. In such cases, an investigation into the cause of the malfunction is necessary, but the investigation to identify the cause takes a considerable amount of time.

[0008] Furthermore, when investigating the cause of a malfunction, it is necessary to check whether the automatic and manual activation valves are open. However, since the automatic and manual activation valves are in the closed position after the water discharge stop operation is performed to address the malfunction, it becomes impossible to determine whether the automatic and manual activation valves were open afterward, making it difficult to determine the cause of the malfunction.

[0009] The present invention aims to provide an open-type sprinkler system and a history-retaining valve that facilitates the investigation of the cause of malfunction by retaining as a history the operation of the activation valve leading up to the simultaneous opening of the simultaneous opening valve. [Means for solving the problem]

[0010] (Open-type sprinkler system) This invention relates to an open-type sprinkler head installed in a protected area for spraying fire-fighting water into the protected area, A simultaneous opening valve has a piping connected to a water source for fire extinguishing on its primary side, a piping connected to an open-type sprinkler head on its secondary side, and a control piping connected to a control port for its own opening and closing operation. A starter valve installed in the control piping, which opens itself to open the simultaneous opening valve, Equipped with open-type sprinklers - It is equipment, A history-holding valve is provided in the control piping in series with the activation valve. This valve opens due to a pressure change between the primary and secondary sides of the activation valve, and the history-holding valve maintains the state in which the activation valve has opened as a history record.

[0011] (Structure of the history retention valve) The history retention valve is A valve opening / closing mechanism that opens due to pressure changes between the control piping connected to its primary and secondary sides when the activation valve opens, A retaining mechanism equipped with a retaining unit that retains the open state of the valve opening / closing mechanism as a history, It is equipped with.

[0012] (History display section of the history retention valve) The retention mechanism of the history retention valve further includes a history display unit that makes the history retained by the retention unit visible from the outside.

[0013] (Open-type sprinkler equipped with pressure-reducing simultaneous release valve) -Equipment The control pipe has a pipe path connected to the drainage side through each of the history retention valve and the start valve in order from the control port. The simultaneous opening valve closes by the pressurization of the control pipe connected to the control port and opens by the depressurization of the control pipe connected to the control port. When the start valve opens, the history retention valve opens by the depressurization of the control pipe connected to its secondary side and retains the opened state of itself as a history.

[0014] (Check valve in the case of a pressure-reducing type simultaneous opening valve) A check valve is provided in the control pipe between the control port and the history retention valve in a direction to prevent backflow from the history retention valve side to the control port side.

[0015] (Open type sprinkler equipped with a pressure-type simultaneous opening valve - Equipment The control pipe has a pipe path connected to the drainage side from the control port and a pipe path branched and connected to the pipe connected to the drainage side from the control port through the start valve and the history retention valve in order, branching from the pipe on the primary side of the simultaneous opening valve. The simultaneous opening valve closes by the depressurization of the control pipe connected to the control port and opens by the pressurization of the control pipe connected to the control port. When the start valve opens, the history retention valve opens by the pressurization of the control pipe connected to its primary side and retains the opened state of itself as a history.

[0016] (Check valve in the case of a pressure-type simultaneous opening valve) A check valve is provided in the control pipe between the control port and the history retention valve in a direction to prevent backflow from the control port side to the history retention valve side.

[0017] (Multiple start valves provided) Multiple start valves are provided in parallel in the control pipe, and a history retention valve is provided for a predetermined start valve.

[0018] (Placement of history-retaining valves within the protected area) The history retention valve is installed at a designated location within the protected area.

[0019] (Placement of history-retaining valve outside the protected area) The history retention valve is installed at a designated location outside the protected area.

[0020] (History retention valve) The present invention relates to a history-keeping valve installed in series with respect to a valve in a pipe in which a valve to be subject to history tracking is provided, When the valve opens, it is connected to its primary and secondary sides. Ta A valve opening and closing mechanism that opens due to pressure changes between pipes, A retaining mechanism equipped with a retaining unit that retains the open state of the valve opening / closing mechanism as a history, It is characterized by having the following features. [Effects of the Invention]

[0021] (Effects of open-type sprinkler systems) The present invention relates to an open-type sprinkler head installed in a protected area for spraying fire-fighting water into the protected area; a simultaneous opening valve having a pipe connected to a fire-fighting water source on its primary side, a pipe connected to the open-type sprinkler head on its secondary side, and a control pipe connected to a control port for its own opening and closing operation; and an activation valve provided on the control pipe that opens the simultaneous opening valve when it opens. - In this system, a history-holding valve is installed in series with the activation valve in the control piping. This valve opens due to a pressure change between the primary and secondary sides of the activation valve, and the history-holding valve maintains the state in which it was activated as a history record. Therefore, if the history-holding valve maintains the state in which it was activated as a history record, it can be confirmed even after the fact that the cause of the malfunction of the open-type sprinkler system was due to a malfunction (misoperation) of the activation valve corresponding to the history-holding valve, making it easier to investigate the cause.

[0022] (Effects of the structure of the history retention valve) Furthermore, the history-keeping valve includes a valve opening / closing mechanism that opens due to pressure changes between the control piping connected to its primary and secondary sides when the activation valve opens, and a holding mechanism that has a holding part that stores the open state of the valve opening / closing mechanism as a history. Therefore, it is possible to store as a history that the activation valve has operated (was operated) with a simple structure.

[0023] (Effect of the history display unit of the history retention valve) Furthermore, the history retention valve's retention mechanism is equipped with a history display unit that makes the history retained by the retention unit visible from the outside, making it easy to check the history retention status by the history retention valve.

[0024] (Open-type sprinkler equipped with pressure-reducing simultaneous release valve) - (Effects of the equipment) Furthermore, the control piping has a piping route that connects to the drain side via a history retention valve and then an activation valve, in that order from the control port. The simultaneous opening valve closes when the control piping connected to the control port is pressurized and opens when the control piping connected to the control port is depressurized. The history retention valve opens when the activation valve opens and the control piping connected to its secondary side is depressurized, and retains its open state as a history. Thus, the simultaneous opening valve is a depressurized simultaneous opening valve in this open-type sprinkler. - This makes it possible to apply it to equipment.

[0025] (Effect of a check valve when a pressure-reducing simultaneous release valve is installed) Furthermore, an open-type sprinkler with a pressure-reducing simultaneous release valve. - In this system, a check valve is installed in the control piping between the control port and the history retention valve to prevent backflow from the history retention valve side to the control port side. Therefore, if other activation valves are installed, this suppresses malfunctions where the history retention valve opens due to pressure changes in the control piping caused by the opening and closing operations of other activation valves. This ensures that the history is reliably retained in response to the opening operation of the target activation valve, thereby improving the resolution of history retention.

[0026] (Open-type sprinkler equipped with a pressurized simultaneous release valve) - (Effects of the equipment) Furthermore, the control piping has a piping route that connects from the control port to the drain side, and a piping route that branches off from the primary side piping of the simultaneous release valve and connects to the piping that connects from the control port to the drain side via the activation valve and history retention valve in that order. The simultaneous release valve closes when the control piping connected to the control port is depressurized and opens when the control piping connected to the control port is pressurized. The history retention valve opens when the activation valve opens, due to the pressurization of the control piping connected to its primary side, and retains its open state as a history. Thus, the simultaneous release valve is a pressurized simultaneous release valve in this open-type sprinkler. - This makes it possible to apply it to equipment.

[0027] (Effect of a check valve when a pressurized simultaneous release valve is installed) Furthermore, an open-type sprinkler with a pressurized simultaneous release valve. - In this equipment, a check valve is installed in the control piping between the control port and the history retention valve in a direction that prevents backflow from the control port side to the history retention valve side, thus achieving the same effect as when a pressure-reducing simultaneous opening valve is used.

[0028] (Effect of multiple activation valves) Furthermore, multiple activation valves are provided in parallel with the control piping, and history retention valves are provided for each designated activation valve, making it possible to determine which activation valve was activated (operated) from the history retained by the history retention valve.

[0029] (Effects of placing history-retaining valves within the protected area) Furthermore, since the history retention valve is installed at a designated location within the protected area, necessary investigations can be carried out on-site within the protected area, making the investigation easier.

[0030] (Effect of placing the history retention valve outside the protected area) Furthermore, since the history retention valve is installed in a designated location outside the protected area, it is possible to prevent the history retention valve from being unnecessarily operated by a third party.

[0031] (Effect of the history retention valve) Furthermore, the same effects as those of the "structure of the history-keeping valve" and the "history display section of the history-keeping valve" in the open-type sprinkler system described above can be obtained with respect to the history-keeping valve. [Brief explanation of the drawing]

[0032] [Figure 1] This is an explanatory diagram showing an open-type sprinkler system equipped with a pressure-reducing simultaneous release valve. [Figure 2] This is an explanatory diagram showing a history-keeping valve installed in the open-type sprinkler system shown in Figure 1. [Figure 3] This is an explanatory diagram showing an open-type sprinkler system equipped with a pressurized simultaneous release valve. [Figure 4] This is an explanatory diagram showing a history-keeping valve installed in the open-type sprinkler system shown in Figure 3. [Modes for carrying out the invention]

[0033] Embodiments of the open-type sprinkler system and history-keeping valve according to the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments.

[0034] [Basic Concepts of the Embodiment] First, the basic concepts of the embodiment will be explained. The embodiment generally relates to an open-type sprinkler system and a history-keeping valve that can be installed in said open-type sprinkler system.

[0035] Here, an "open-type sprinkler system" is defined as a system equipped with open-type sprinkler heads, a simultaneous release valve, and an activation valve.

[0036] Furthermore, an "open-type sprinkler head" is a sprinkler head installed in a protected area that sprays fire-fighting water into that area, and has a structure in which the water outlet is always open. In addition, a "protected area" is the area that is protected by water sprayed from an open-type sprinkler head, and is an outdoor or indoor area of ​​a certain size, and is a concept that includes areas such as rooms, corridors, and stairwells in a building. In particular, since open-type sprinkler systems are intended for areas where flammable materials exist that can rapidly grow and spread in a fire, the "protected area" is a concept that includes at least the stage area of ​​a theater.

[0037] Furthermore, a "simultaneous opening valve" is a valve in which piping connected to a water source for firefighting is connected to the primary side, piping connected to an open-type sprinkler head is connected to the secondary side, and control piping is connected to a control port for opening and closing the valve. When opened, it supplies firefighting water that has filled the primary side to the secondary side, causing the firefighting water to be sprayed from the open-type sprinkler head. In addition, a "water source for firefighting" refers to the source of the firefighting water supply, and includes pressurized water supply equipment such as fire pumps.

[0038] Furthermore, the "control port" of a simultaneous opening valve is a port that receives pressure changes (depression or pressurization) in the connected control piping used to open and close the valve of the simultaneous opening valve, and includes what is called a "sensing port." Also, the "control piping" is a component that applies pressure changes to the simultaneous opening valve via the control port, and includes, for example, a component that applies pressure changes by filling or draining fire extinguishing water into the control piping connected to the control port.

[0039] Furthermore, there are two types of simultaneous opening valves: "pressure-reducing simultaneous opening valves" and "pressure-reducing simultaneous opening valves." A "pressure-reducing simultaneous opening valve" is a simultaneous opening valve that closes when the control piping connected to the control port is pressurized and opens when the control piping connected to the control port is depressurized. On the other hand, a "pressure-reducing simultaneous opening valve" is a simultaneous opening valve that closes when the control piping connected to the control port is depressurized and opens when the control piping connected to the control port is pressurized.

[0040] Furthermore, the "activation valve" is installed in the control piping and, when opened, causes the simultaneous opening valve to open. When the activation valve opens, it causes a pressure change in the control piping connected to the control port of the simultaneous opening valve, thereby causing the simultaneous opening valve to open.

[0041] Furthermore, the term "activation valve" includes activation valves such as "automatic activation valves" and "manual activation valves." An "automatic activation valve" is an activation valve that opens based on fire detection by a fire prevention system that monitors abnormalities within the protected area, while a "manual activation valve" is an activation valve that opens through a human activation operation (opening operation). In addition, since "manual activation valves" are operated by humans, this term includes those installed within protected areas that could potentially become the site of a fire.

[0042] Furthermore, the "open-type sprinkler system" of the embodiment is characterized in that a history-holding valve is provided in series with the activation valve in the control piping, which opens due to the pressure change between the control piping connected to its primary and secondary sides when the activation valve opens, and holds the state in which it has opened as a history. In addition, "holding as a history" means that the history-holding valve has opened so that it can be recognized later, and the fact that the history-holding valve has kept a history of the state in which it has opened is equivalent to the activation valve in question opening (being opened), and thus effectively holds the fact that the activation valve has opened as a history.

[0043] Furthermore, the structure of the "history-holding valve" is arbitrary, but for example, it comprises a valve opening / closing mechanism that opens due to a pressure change between the control piping connected to the primary and secondary sides when the activation valve opens, and a holding mechanism that has a holding part that holds the open state of the valve opening / closing mechanism as history. In addition, the "history-holding valve" may also be equipped with a history display part that makes the history held by the holding part visible from the outside.

[0044] Furthermore, if the simultaneous opening valve is a "pressure-reducing simultaneous opening valve," the control piping has a piping route that connects to the drain side via the control port, history-holding valve, and activation valve in that order. The history-holding valve opens when the activation valve opens due to the pressure reduction in the control piping connected to its secondary side, and retains the state in which it opened as a history record.

[0045] Furthermore, if the simultaneous opening valve is a "pressurized simultaneous opening valve," the control piping has a piping route connected from the control port to the drain side, and a piping route that branches off from the primary side piping of the simultaneous opening valve and connects to the piping connected from the control port to the drain side via the activation valve and history retention valve in that order. The history retention valve opens when the activation valve opens due to the pressurization of the control piping connected to its primary side, and retains its opened state as a history record.

[0046] Furthermore, the piping routes of the control piping limited by the "pressure-reducing simultaneous release valve" and the "pressure-reducing simultaneous release valve" merely limit the piping routes to the history-holding valve (and activation valve) which are characteristic of the present invention, and do not prevent the control piping from having other arrangement routes.

[0047] Furthermore, in order to improve the resolution of the detection of whether the target activation valve has been opened, a check valve may be provided in the control piping between the control port and the history retention valve. If the simultaneous opening valve is a "pressure-reducing simultaneous opening valve," the check valve is provided in a direction that prevents backflow from the history retention valve side to the control port side. If the simultaneous opening valve is a "pressure-reducing simultaneous opening valve," the check valve is provided in a direction that prevents backflow from the control port side to the history retention valve side.

[0048] Here, a "check valve" is a valve that allows fluid to flow in one direction by opening the valve and prevents fluid from flowing in the reverse direction by closing the valve.

[0049] Furthermore, multiple activation valves are provided in parallel with the control piping, and history retention valves are provided for designated activation valves. Here, it is not necessary for all activation valves to have history retention valves; history retention valves may be provided for one or a predetermined number of activation valves selected from the multiple activation valves.

[0050] Furthermore, the history retention valve may be installed at a predetermined location within the protected area, or at a predetermined location outside the protected area.

[0051] The following describes specific embodiments. In these embodiments, the starting valves consist of three starting valves: a manual starting valve located within the protected area, a manual starting valve located outside the protected area, and an automatic starting valve. The history retention valve is a history retention valve located within the protected area, which is for the manual starting valve located within the protected area. The first embodiment is described as a "pressure-reducing simultaneous opening valve," and the second embodiment is described as a "pressure-reducing simultaneous opening valve."

[0052] [Specific details of the embodiment] We will now provide a more detailed explanation of open-type sprinkler systems and history-keeping valves. The explanation will be divided as follows: a. First embodiment of an open-type sprinkler system a1. Configuration of an open-type sprinkler system using a pressure-reducing simultaneous release valve a2. History retention valve a3. Valve opening and closing mechanism of the history retention valve a4. Holding mechanism of the history retention valve a5. Hysteresis resolution by check valve b. Second embodiment of an open-type sprinkler system b1. Configuration of an open-type sprinkler system using a pressurized simultaneous release valve b2. History retention valve b3. Hysteresis resolution by check valve c. Modified form of the present invention

[0053] [a. First embodiment of an open-type sprinkler system] A first embodiment of an open-type sprinkler system using a pressure-reducing simultaneous release valve will be described. In this description, refer to Figure 1, which shows an open-type sprinkler system using a pressure-reducing simultaneous release valve, and Figure 2, which shows a history-keeping valve installed in the open-type sprinkler system. Figure 2(A) shows the valve closed state in which history is not retained, and Figure 2(B) shows the valve open state in which history is retained.

[0054] (a1. Configuration of an open-type sprinkler system using a pressure-reducing simultaneous release valve) First, the configuration of an open-type sprinkler system using a pressure-reducing simultaneous release valve will be explained. As shown in Figure 1, a fire pump 10, which functions as a pressurized water supply device, is installed in a pump room in the basement of the building, and the fire pump 10 is driven by a motor 12. The motor 12 receives operational control such as starting and stopping from the pump control panel 47. By being driven by the motor 12, the fire pump 10 draws in fire extinguishing water from the water source tank 14 and supplies pressurized fire extinguishing water (pressurized fire extinguishing water) to the main water supply pipe 20.

[0055] Furthermore, a pressure tank 16 is provided for the fire pump 10. The pressure tank 16 is connected to the main water supply pipe 20, and pressurized fire extinguishing water is introduced from the main water supply pipe 20, compressing the nitrogen or other gases filled inside to a predetermined pressure. The pressure tank 16 is also equipped with a pressure switch 18, which detects a decrease in pressure in the main water supply pipe 20 from the pressure in the pressure tank 16, causing the internal pressure to drop below a specified pressure. The pressure switch 18 outputs a pressure drop detection signal to the pump control panel 47, and upon receiving this signal, the pump control panel 47 starts the motor 12, which drives the fire pump 10 to adjust the internal pressure in the water supply pipe 20.

[0056] A branch pipe 22 extends from the main water supply pipe 20 toward the protected area 11. A water flow detection device 24 is installed at the branch portion of the branch pipe 22 from the main water supply pipe 20, following a water control valve 23. When pressurized fire extinguishing water flows in the branch pipe 22 due to water spraying from sprinkler heads, the water flow detection device 24 opens the valve body, turns on the water flow detection switch 26, and outputs a discharge alarm signal to the monitoring panel 46.

[0057] Water flow detection device 24 A pressure-reducing simultaneous release valve 28 is provided in the secondary side branch pipe 22, and the branch pipe 22 is connected to the primary port (primary side) of the pressure-reducing simultaneous release valve 28. A fire extinguishing pipe 30 is connected to the secondary port (secondary side) of the pressure-reducing simultaneous release valve 28, and the fire extinguishing pipe 30 is extended to the protected area 11, to which an open-type sprinkler head 32 is connected.

[0058] The pressure-reducing simultaneous opening valve 28 is a known simultaneous opening valve and is equipped with a primary port, a secondary port, and a control port 2810. The control port 2810 controls the pressure in the cylinder chamber of the piston cylinder mechanism, which functions as a valve opening and closing mechanism in the pressure-reducing simultaneous opening valve 28. Pressurized fire extinguishing water is filled into the cylinder chamber and pressurized to push the piston, causing the valve body to contact the valve seat and the valve to be in a closed state. Pressurized fire extinguishing water is drained from the cylinder chamber and the pressure is reduced, causing the piston to return by the force of the spring, pulling the valve body away from the valve seat and opening the valve.

[0059] A control pipe 34 is connected to the control port 2810 of the pressure-reducing simultaneous release valve 28. A portion of the control pipe 34 is led out to the protected area 11, where a manual activation valve 48 is provided for on-site activation. This manual activation valve 48 is connected to the drain pipe 35 on the drain side. In addition, a history-keeping valve 50 and a check valve 52 are also provided, but their details will be described separately.

[0060] Furthermore, the control piping 34 connected to the control port 2810 of the pressure-reducing simultaneous release valve 28 is connected to the drain pipe 35 via a parallel circuit of an automatically activated valve 36 using an electric valve and a manually activated valve 38, separate from the piping route led out to the protected area 11 side. In addition, the control port 2810 is connected to a branch pipe 22 which is connected to the primary port of the pressure-reducing simultaneous release valve 28 via a gate valve 40.

[0061] When starting operation of an open-type sprinkler system using a pressure-reducing simultaneous release valve 28, the manual start valves 38, 48 and the automatic start valve 36 are closed, the gate valve 40 is opened, pressurized fire extinguishing water is supplied to the cylinder chamber from the primary side branch pipe 22 via the control port 2810 to pressurize the pressure-reducing simultaneous release valve 28, the piston is pushed and the valve body is brought into contact with the valve seat to close the valve, and then the gate valve 40 is closed to maintain the pressurized state in the cylinder chamber, thereby maintaining the closed state of the pressure-reducing simultaneous release valve 28.

[0062] Fire detectors 42 are installed in the protected area 11 where open-type sprinkler heads 32 are installed, and the detector lines 44 from the fire detectors 42 are connected to the fire receiver 45. When the fire detectors 42 installed in the protected area 11 detect a fire and activate, they output a fire alarm signal to the fire receiver 45. Upon receiving the fire alarm signal, the fire receiver 45 outputs a fire alarm and also outputs a fire transfer signal to the monitoring panel 46. Upon receiving the fire transfer signal from the fire receiver 45, the monitoring panel 46 outputs a drive signal to the automatic activation valve 36 to open it, and connects the control piping 34 connected to the control port 2810 to the drain pipe 35 on the drain side. This causes the pressurized fire extinguishing water in the cylinder chamber of the pressure-reducing simultaneous release valve 28 to be drained and the pressure reduced. The piston returns by the force of the spring, pulling the valve body away from the valve seat, causing the pressure-reducing simultaneous release valve 28 to open, and fire extinguishing water to be sprayed from the open-type sprinkler heads 32.

[0063] Furthermore, if the manual starting valve 38 connected in parallel to the automatic starting valve 36 and the manual starting valve 48 installed in the protected area 11 are activated (opened), the automatic starting valve 36 Similar to when the valve is opened, the control piping 34 connected to the control port 2810 is connected to the drain pipe 35 on the drain side, causing the pressure-reducing simultaneous opening valve 28 to open and fire-fighting water to be sprayed from the open-type sprinkler head 32.

[0064] (a2. History retention valve) Furthermore, in the open-type sprinkler system of this embodiment, a history retention valve 50 is provided in the control piping 34 which is the primary side of the manual activation valve 48 installed in the protected area 11, and a check valve 52 is provided on the side closer to the pressure-reducing simultaneous release valve 28. The check valve 52 is designed to open and allow flow from the control port 2810 side to the history retention valve 50 side, while closing and blocking flow from the history retention valve 50 side to the control port 2810 side.

[0065] The history retention valve 50 opens when the manual release valve 48 is used to open the pressure-reducing simultaneous release valve 28, due to the pressure reduction in the control piping 34 on the secondary side of the history retention valve 50, and retains the state in which it opened as a history record. Its structure is arbitrary, but for example, it has the structure shown in Figure 2.

[0066] As shown in Figure 2, the history-holding valve 50 has a primary port 56 that functions as an inlet port and a secondary port 58 that functions as an outlet port on both the upper and lower sides of the valve body 54 in the illustration. In the open-type sprinkler system of this embodiment, the control piping 34 on the side of the pressure-reducing simultaneous opening valve 28 is connected to the primary port 56, and the control piping 34 on the side of the drain pipe 35 is connected to the secondary port 58. The inside of the valve body 54 is divided into a primary side and a secondary side by a partition wall, and a valve seat 60 is provided in the partition portion.

[0067] (a3. Valve opening and closing mechanism of the history retention valve) The valve opening and closing mechanism of the history-holding valve 50 is composed of, for example, an open-to-the-atmosphere piston-cylinder mechanism. A piston 62 and a cylinder 64 are provided on the secondary side of the valve body 54 corresponding to the valve seat 60. Part of the cylinder 64 (part of the right end in Figure 2) is open to the atmosphere, and the piston 62 is slidably mounted relative to the cylinder 64. A valve body 61 is provided on one end of the piston 62 that faces the valve seat 60, and a rod 65 is provided inside the piston 62, with one end fixed and the other end extending out into the atmosphere through the open portion of the cylinder 64. A spring 66 is positioned between the inner surface of the open end of the cylinder 64 and one end of the piston 62.

[0068] During normal operation of the open-type sprinkler system, the manual activation valve 48 (see Figure 1) located on the secondary port 58 side is in a closed state, and the primary and secondary sides of the history retention valve 50 are at the same pressure due to the pressurized fire extinguishing water that is filled in. As shown in Figure 2(A), the piston 62 is pushed out by the spring 66, and the valve body 61 comes into contact with the valve seat 60, closing the flow path.

[0069] In contrast, when the manual activation valve 48 is activated to open the pressure-reducing simultaneous release valve 28, the secondary port 58 communicates with the drain pipe 35, and the control piping 34 on the secondary side of the history-holding valve 50 is depressurized. As a result, the piston 62 is pushed back against the spring 66 by the pressurized fire-fighting water on the primary side, and as shown in Figure 2(B), the valve body 61 separates from the valve seat 60 and opens the flow path.

[0070] (a4. Holding mechanism of the history retention valve) Furthermore, a holding mechanism 70 is provided for the valve opening and closing mechanism of the history-holding valve 50, which uses a piston-cylinder mechanism. The holding mechanism 70 holds the state in which the valve opening and closing mechanism has been opened as a history record so that it can be visually confirmed from the outside. Its structure is arbitrary, but in this embodiment it consists of an indicator 68, a locking body 72, a locking pin 74, a spring 76, a knob 78, and a cover 80.

[0071] The indicator 68 corresponds to the history display unit and displays the state in which the valve opening / closing mechanism of the history holding valve 50 has opened as a history that can be seen from the outside. The indicator 68 is, for example, a cylindrical member and is fixed to the other end of the rod 65 that is taken out of the cylinder 64 into the atmosphere. As shown in Figure 2(A), when the valve opening / closing mechanism is closed, a part of the tip of the indicator protrudes slightly to the outside from the cover 80, indicating that the history is not being held. When the valve opening / closing mechanism opens, as shown in Figure 2(B), it protrudes further to the outside of the cover 80 from the state in which the history is not being held, indicating that the history is being held.

[0072] The locking body 72 corresponds to the retaining part, and when the valve opening / closing mechanism opens, it uses the indicator 68 to retain the history. The locking body 72 is, for example, a cone, with a locking pin 74 fixed to the bottom of the cone and the locking pin 74 brought out to the outside from the side of the cover 80, and a knob 78 provided at the tip of the locking pin 74, and the locking body 72 is biased toward the indicator 68 by a spring 76 provided between the bottom of the locking body 72 and the inner surface of the cover 80.

[0073] As shown in Figure 2(A), in the valve closed state of the valve opening / closing mechanism, when the holding mechanism 70 is in a non-hiding state of history, the tip of the locking body 72 is pressed against the indicator 68 by the spring 76, and the locking body 72 is in an unlocked state, allowing the indicator 68 to move in accordance with the movement (opening operation) of the piston 62 of the valve opening / closing mechanism.

[0074] When the manual activation valve 48, which is used to open the pressure-reducing simultaneous opening valve 28, is activated, the history-holding valve 50 is opened. As shown in Figure 2(B), the indicator 68 moves with the movement of the piston 62 and protrudes significantly outward from the cover 80. As the indicator 68 moves, the locking body 72 moves inside the indicator 68, restricting its inward movement. The locking body 72 then locks the piston 62 and indicator 68, preventing them from returning to their closed positions. As a result, the indicator 68 is locked in the history-holding state, significantly protruding outward, by the locking body 72, and displays the state in which the valve opening / closing mechanism opened based on the activation operation of the manual activation valve 48, which is recorded as history. The history-holding state can be released by pulling up the locking body 72 with the knob 78, releasing the lock and returning the piston 62 and indicator 68 to their closed positions.

[0075] (a5. Hysteresis resolution due to check valve) Next, the function of the check valve 52 provided in the control piping 34 for the manual activation valve 48 in Figure 1 will be explained.

[0076] Here, the control piping 34 for the manual activation valve 48 will be described as follows: the control piping 34 from the check valve 52 to the pressure-reducing simultaneous release valve 28 side will be referred to as the first control piping 3410, and the control piping 34 from the check valve 52 to the history-holding valve 50 side will be referred to as the second control piping 3420.

[0077] The history retention valve 50 operates and retains history when the manual activation valve 48, installed in the protected area 11, is activated to open the pressure-reducing simultaneous opening valve 28. However, if a check valve 52 is not installed in the control piping 34, the pressure in the control piping 34 connected to the primary port 56 of the history retention valve 50 will fluctuate due to the opening and closing operation of the pressure-reducing simultaneous opening valve 28 caused by the opening and closing operation of the automatic activation valve 36 or manual activation valve 38, which are installed separately from the manual activation valve 48. As a result, the pressure fluctuation in the control piping 34 connected to the primary port 56 of the history retention valve 50 disrupts the pressure balance between the primary port 56 and the secondary port 58 of the history retention valve 50, potentially causing the history retention valve 50 to operate and retain history. There is a concern that it may become impossible to distinguish whether the history retained by the history retention valve 50 is due to the operation of the manual activation valve 38, manual activation valve 48, or automatic activation valve 36.

[0078] In contrast, if a check valve 52 is provided in the control piping 34 for the manual activation valve 48, the check valve 52 prevents flow from the second control piping 3420 to the first control piping 3410. Therefore, even if the automatic activation valve 36 or the manual activation valve 38 opens, the pressure in the first control piping 3410 decreases, but the pressure in the second control piping 3420 remains constant. Furthermore, even when the automatic activation valve 36 or the manual activation valve 38 closes and the pressure in the first control piping 3410 rises again, the pressure in the second control piping 3420 remains constant. Consequently, even if the automatic activation valve 36 or the manual activation valve 38 opens or closes, the pressure on the primary port 56 side of the history retention valve 50 does not fluctuate, and the pressure balance between the primary port 56 and the secondary port 58 is maintained. As a result, the history retention valve 50 does not operate, and the history is not retained by the operation of either the manual activation valve 38 or the automatic activation valve 36.

[0079] Furthermore, when the manual activation valve 48 installed in the protected area 11 is activated, the secondary port 58 communicates with the drain pipe 35, causing a decrease in pressure on the secondary side of the history retention valve 50. This opens the valve opening / closing mechanism of the history retention valve 50, and this state is recorded as history. This allows for reliable identification of the history as being caused by the activation of the manual activation valve 48 in the protected area 11, thereby improving the resolution of the history.

[0080] [b. Second embodiment of an open-type sprinkler system] Next, we will describe an open-type sprinkler system using a pressurized simultaneous release valve, which is a second embodiment. In this description, please refer to Figure 3, which shows an open-type sprinkler system using a pressurized simultaneous release valve, and Figure 4, which shows a history retention valve installed in the open-type sprinkler system. Figure 4(A) shows the valve closed state in which history is not retained, and Figure 4(B) shows the valve open state in which history is retained.

[0081] (b1. Configuration of an open-type sprinkler system using a pressurized simultaneous release valve) First, the configuration of the open-type sprinkler system using a pressurized simultaneous release valve will be described. As shown in Figure 3, the open-type sprinkler system of this embodiment differs from the open-type sprinkler system shown in Figure 1 in that it is equipped with a pressurized simultaneous release valve 100 instead of a pressure-reducing simultaneous release valve. However, the same parts are denoted by the same reference numerals, and their explanation will be omitted.

[0082] The pressurized simultaneous release valve 100 is a known simultaneous release valve and is equipped with a primary port, a secondary port, and a control port 1010. The control port 1010 controls the pressure in the cylinder chamber of the piston cylinder mechanism, which functions as a valve opening and closing mechanism in the pressurized simultaneous release valve 100. By connecting the cylinder chamber to the drain side and draining the pressurized fire extinguishing water to reduce the pressure, the spring pushes the piston, causing the valve body to contact the valve seat and the valve to be in a closed state. By filling the cylinder chamber with pressurized fire extinguishing water and pressurizing it, the piston returns against the spring, pulling the valve body away from the valve seat and opening the valve.

[0083] A control pipe 34 is connected to the control port 1010 of the pressurized simultaneous release valve 100. The control pipe 34 is routed from the control port 1010 through the protected area 11 to the primary side of the pressurized simultaneous release valve 100 and is connected to a branch pipe 22 which forms the primary side piping. A manual activation valve 48 is provided on the control pipe 34 that is routed into the protected area 11, corresponding to its location within the protected area 11.

[0084] Furthermore, the control piping 34 connected to the control port 1010 of the pressurized simultaneous release valve 100 is connected to the branch pipe 22, which is the primary side piping, via a parallel circuit of an automatically activated valve 36 using an electric valve and a manually activated valve 38, separate from the piping route drawn out to the protected area 11 side. In addition, the control piping 34 connected to the control port 1010 is connected to the drain pipe 35 on the drain side via an auto-drip 55. The auto-drip 55 flows a predetermined minute flow rate, determined by the orifice, to the drain side.

[0085] When starting operation of an open-type sprinkler system using a pressurized simultaneous release valve 100, pressurized fire extinguishing water is supplied from the branch pipe 22 to the control piping 34 on the primary side of the manual start valves 38, 48 and the automatic start valve 36, with the manual start valves 38, 48 and the automatic start valve 36 closed. At this time, the control piping 34 on the secondary side of the manual start valves 38, 48 and the automatic start valve 36 is in a no-pressure state because it is connected to the drain pipe 35 on the drain side via the auto-drip 55, and the cylinder chamber of the pressurized simultaneous release valve 100 is also in a no-pressure state because it is connected to the drain side, so the pressurized simultaneous release valve 100 is in a closed state due to the piston being pushed out by the spring.

[0086] When a fire detector 42 installed in the protected area 11 detects a fire and activates, it outputs a fire alarm signal to the fire alarm receiver 45. Upon receiving the fire alarm signal, the fire alarm receiver 45 outputs a fire alarm and also outputs a fire transfer signal to the monitoring panel 46. Upon receiving the fire transfer signal from the fire alarm receiver 45, the monitoring panel 46 outputs a drive signal to the automatic activation valve 36, causing the automatic activation valve 36 to open. Pressurized fire extinguishing water is supplied from the branch pipe 22 through the automatic activation valve 36 to the cylinder chamber of the pressurized simultaneous release valve 100, pressurizing it. The piston then moves against the spring, pulling the return valve body away from the valve seat, causing the pressurized simultaneous release valve 100 to open, and fire extinguishing water is sprayed from the open-type sprinkler heads 32.

[0087] Furthermore, when the manual activation valve 38, which is connected in parallel to the automatic activation valve 36, and the manual activation valve 48, which is installed in the protected area 11, are opened, pressurized fire extinguishing water is supplied to the pressurized simultaneous release valve 100, which pressurizes the cylinder chamber, causing the pressurized simultaneous release valve 100 to open and fire extinguishing water to be sprayed from the open-type sprinkler heads 32, just as when the automatic activation valve 36 is opened.

[0088] Furthermore, even when pressurized fire extinguishing water is supplied to the cylinder chamber of the pressurized simultaneous release valve 100, pressurized fire extinguishing water is also drained from the control piping 34 connected to the control port 1010 via the auto-drip 55. Therefore, the amount of drainage determined by the auto-drip 55 is set to be less than the amount of pressurized fire extinguishing water supplied to the cylinder chamber of the pressurized simultaneous release valve 100.

[0089] (b2. History retention valve) Furthermore, in the open-type sprinkler system of this embodiment, a history retention valve 50 is provided in the control piping 34 which is secondary to the manual activation valve 48 installed in the protected area 11, and a check valve 52 is provided on the side closer to the pressurized simultaneous release valve 100. The check valve 52 is designed to close and block the flow from the control port 1010 to the history retention valve 50, while opening and allowing the flow from the history retention valve 50 to the control port 1010.

[0090] The history retention valve 50 opens when the pressurized simultaneous opening valve 100 is opened by the pressurization of the control piping 34, which is on the primary side of the history retention valve 50, and retains the state in which it has opened as a history record. Its structure is arbitrary, but for example it has the structure shown in Figure 4.

[0091] As shown in Figure 4, the structure of the history retention valve 50 in this embodiment (including the valve opening / closing mechanism and the retention mechanism) is the same as that of the history retention valve 50 shown in Figure 2. The only difference is that the lower side is the primary port 56 and the upper side is the secondary port 58, and the same reference numerals are used, so no further explanation is provided.

[0092] During normal operation of the open-type sprinkler system, the manual activation valve 48 (see Figure 1) located on the primary port 56 side is in a closed state, the primary side of the history retention valve 50 is unpressurized, and the control pipe 34 located on the secondary port 58 side is in communication with the drain pipe 35 on the drain side via the auto drip 55, so the secondary side of the history retention valve 50 is also unpressurized, and the primary and secondary sides of the history retention valve 50 are at the same pressure. As shown in Figure 4(A), the piston 62 is pushed out by the spring 66, and the valve body 61 comes into contact with the valve seat 60, closing the flow path.

[0093] Furthermore, as shown in Figure 4(A), in the valve closed state of the valve opening / closing mechanism, where the history is not being retained, the tip of the locking body 72 is pressed against the indicator 68 by the spring 76. The locking body 72 is in an unlocked state, allowing the indicator 68 to move in accordance with the movement (opening operation) of the piston 62 of the valve opening / closing mechanism.

[0094] In contrast, when the manual activation valve 48 is activated to open the pressurized simultaneous release valve 100, pressurized fire extinguishing water from the branch pipe 22 is supplied to the primary port 56 via the manual activation valve 48, and the primary side of the history retention valve 50 is pressurized. Pushed by the pressurized fire extinguishing water on the primary side, the piston 62 is pushed out against the spring 66, and as shown in Figure 4(B), the valve body 61 separates from the valve seat 60 and opens the flow path.

[0095] Furthermore, as shown in Figure 4(B), the holding mechanism 70 of the history holding valve 50 causes the indicator 68 to move as the piston 62 moves, protruding significantly outward from the cover 80. As the indicator 68 moves, the locking body 72 moves inside the indicator 68, restricting its inward movement, thereby locking the piston 62 and indicator 68 in a locked state, preventing them from returning to their closed positions. As a result, the indicator 68 is locked in the history holding state, protruding significantly outward by the locking body 72, and displays the state in which the valve opening / closing mechanism opened based on the activation operation of the manual activation valve 48, which is recorded as the history.

[0096] (b3. Hysteresis resolution due to check valve) Next, the function of the check valve 52 provided in the control piping 34 for the manual activation valve 48 in Figure 3 will be explained.

[0097] Here, the control piping 34 for the manual activation valve 48 will be described as follows: the control piping 34 from the check valve 52 to the pressurized simultaneous release valve 100 will be referred to as the first control piping 3410, and the control piping 34 from the check valve 52 to the history retention valve 50 will be referred to as the second control piping 3420.

[0098] The history retention valve 50 operates and retains history when the manual activation valve 48, installed in the protected area 11, is activated to open the pressurized simultaneous release valve 100. However, if a check valve 52 is not installed in the control piping 34, the pressure in the control piping 34 connected to the secondary port 58 of the history retention valve 50 will fluctuate due to the opening and closing operation of the pressurized simultaneous release valve 100 caused by the opening and closing operation of the automatic activation valve 36 or manual activation valve 38, which are installed separately from the manual activation valve 48. As a result, the pressure fluctuation in the control piping 34 connected to the secondary port 58 of the history retention valve 50 disrupts the pressure balance between the primary port 56 and the secondary port 58 of the history retention valve 50, potentially causing the history retention valve 50 to operate and retain history. There is a concern that it may become impossible to distinguish whether the history retained by the history retention valve 50 is due to the operation of the manual activation valve 38, manual activation valve 48, or automatic activation valve 36.

[0099] In contrast, if a check valve 52 is provided in the control piping 34 for the manual activation valve 48, the flow from the first control piping 3410 to the second control piping 3420 will be blocked by the check valve 52. Even when the pressurized simultaneous release valve 100 is opened by the opening operation of the automatic activation valve 36 or the manual activation valve 38, the pressure in the first control pipe 3410 rises, but the pressure in the second control pipe 3420 remains unchanged. Furthermore, when the opened automatic activation valve 36 or the manual activation valve 38 closes and the pressure in the first control pipe 3410 decreases again, the pressure in the second control pipe 3420 remains unchanged. Therefore, even when the automatic activation valve 36 or the manual activation valve 38 opens or closes, the pressure on the secondary port 58 side of the history retention valve 50 does not fluctuate, and the pressure balance between the primary port 56 side and the secondary port 58 side is maintained. As a result, the history retention valve 50 does not operate, and the history is not retained by the operation of either the manual activation valve 38 or the automatic activation valve 36.

[0100] Furthermore, when the manual activation valve 48 installed in the protected area 11 is activated, pressurized fire extinguishing water is supplied to the primary port 56 and pressurized, causing the valve opening / closing mechanism of the history retention valve 50 to open. This state is then retained as history, making it possible to reliably identify that the history was caused by the activation of the manual activation valve 48 in the protected area 11, thereby improving the resolution of the history.

[0101] [e. Variations of the present invention] Modifications of the open-type sprinkler system and history-retaining valve according to the present invention will now be described. In addition to the embodiments described above, the open-type sprinkler system and history-retaining valve of the present invention include the following modifications.

[0102] (History display) In the above embodiment, the history of the valve opening and closing mechanism of the history-holding valve is made visible from the outside by the amount of movement of an indicator that functions as a history display unit. However, a history-holding detection switch may be provided that operates when the indicator moves to a predetermined history-holding position, and a history-holding detection signal from the history-holding detection switch may be transmitted to a monitoring panel or the like to display the history.

[0103] (History retention valve) Furthermore, while the above embodiment took the example of a history-keeping valve that uses a manually activated valve that rotates a simultaneous opening valve installed in an open-type sprinkler system as the subject of the history, it is not limited to this and may be installed in any suitable valve for which it is desired to record its operation as a history.

[0104] Furthermore, in the above embodiment, a history retention valve is provided for a manually activated valve located in the protected area, but it may also be provided for other automatically activated valves, manually activated valves, or multiple activated valves. In addition, the history retention valve does not necessarily have to be located within the protected area; it may be provided at a predetermined location outside the protected area to prevent a third party from releasing the history retention state.

[0105] (others) Furthermore, the present invention includes appropriate modifications that do not impair its purpose and advantages, and is not limited by the numerical values ​​shown in the above embodiments. [Explanation of Symbols]

[0106] 10: Fire pump 11: Protected area 12: Motor 14: Water source tank 16: Pressure tank 18: Pressure switch 20: Main water supply pipe twenty two: Branch pipe twenty three: Water control valve 24: Water flow detection device 26: Water flow detection switch 28: Pressure-reducing simultaneous release valve 2810: Control port 30: Fire extinguishing piping 32: Open-type sprinkler head 34: Control Piping 3410: First control piping 3420: Second control piping 35: Drain pipe 36: Automatic starting valve 38,48: Manual activation valve 40: Gate valve 42:Fire detector 44: Sensor circuit 45: Fire alarm receiver 46: Monitoring board 47: Pump control panel 50: History-retaining valve 52: Check valve 54: Valve body 56: Primary Port 58: Secondary port 60: Valve seat 61: Valve body 62: Piston 64: Cylinder 65: Rod 66 ,76 : Spring 68: Indicator 70: Retention mechanism 72: Locked 74: Lock pin 78: Nobu 80: Cover 100: Pressurized simultaneous release valve 1010: Control port

Claims

1. An open-type sprinkler head is installed in the protected area and sprays fire-fighting water into the protected area, A simultaneous opening valve has a piping connected to the water source for fire extinguishing water on its primary side, a piping connected to the open-type sprinkler head on its secondary side, and a control piping connected to a control port for its own opening and closing operation. A start valve provided in the control piping, which opens itself to open the simultaneous opening valve, An open-type sprinkler system equipped with, An open-type sprinkler system characterized in that, when the activation valve opens, a history-holding valve is provided in the control piping so as to be in series with the activation valve, which opens due to a pressure change between the control piping connected to its primary and secondary sides, and holds the state in which it has opened as a history.

2. In the open-type sprinkler system according to claim 1, The history retention valve is When the aforementioned activation valve opens, a valve opening / closing mechanism opens due to a pressure change between the control piping connected to its primary and secondary sides, A holding mechanism comprising a holding unit that stores the open state of the valve opening / closing mechanism as a history, An open-type sprinkler system characterized by having the following features.

3. In the open-type sprinkler system according to claim 2, The holding mechanism of the history-holding valve is further characterized by comprising a history display unit that makes the history held by the holding unit visible from the outside.

4. In the open-type sprinkler system according to claim 1, The control piping has a piping path that connects to the drain side via the control port, the history retention valve, and the activation valve in that order, The aforementioned simultaneous opening valve closes when the control piping connected to the control port is pressurized, and opens when the control piping connected to the control port is depressurized. The aforementioned history-holding valve is characterized in that, when the activation valve opens, it opens due to the pressure reduction of the control piping connected to its secondary side and holds the state in which it has opened as a history.

5. In the open-type sprinkler system according to claim 4, An open-type sprinkler system characterized in that a check valve is provided in the control piping between the control port and the history retention valve in a direction that prevents backflow from the history retention valve side to the control port side.

6. In the open-type sprinkler system according to claim 1, The control piping has a piping route connected from the control port to the drain side, and a piping route that branches off from the primary side piping of the simultaneous opening valve and is connected to the piping connected from the control port to the drain side via the activation valve and the history holding valve in that order. The aforementioned simultaneous opening valve closes when the control piping connected to the control port is depressurized, and opens when the control piping connected to the control port is pressurized. The aforementioned history-holding valve is characterized in that, when the activation valve opens, it opens due to the pressurization of the control piping connected to its primary side and holds the state in which it has opened as a history.

7. In the open-type sprinkler system according to claim 6, An open-type sprinkler system characterized in that a check valve is provided in the control piping between the control port and the history retention valve in a direction that prevents backflow from the control port side to the history retention valve side.

8. In the open-type sprinkler system according to claim 1, An open-type sprinkler system characterized in that a plurality of activation valves are provided in parallel with the control piping, and a history-keeping valve is provided for a predetermined activation valve.

9. In the open-type sprinkler system according to claim 1, The open-type sprinkler system is characterized in that the history-keeping valve is installed at a predetermined location within the protected area.

10. In the open-type sprinkler system according to claim 1, The open-type sprinkler system is characterized in that the history-keeping valve is installed at a predetermined location outside the protected area.

11. A history-keeping valve is installed in a piping system in which a valve to be subject to history tracking is provided, so as to be in series with the valve, When the aforementioned valve opens, a valve opening / closing mechanism is provided that opens due to a pressure change between the piping connected to its primary and secondary sides, A holding mechanism comprising a holding unit that stores the open state of the valve opening / closing mechanism as a history, A history-keeping valve characterized by having the following features.

12. In the history retention valve according to claim 11, The history holding valve is characterized in that the holding mechanism further includes a history display unit that makes the history held by the holding unit visible from the outside.

Images