JP2015097615A - Water flow detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water flow detecting device capable of surely preventing malfunction of an alarm unit by inhibiting reversing between pressure of a primary side and pressure of a secondary side of a valve element due to trouble and opening of a pressure regulating valve to avoid opening of the valve element.SOLUTION: A water flow detecting device 2 is provided which includes a valve element 22 for closing the pipe conduit of a sprinkler pipe 12 so as to divide the pipe conduit into a primary side passage 121 and a secondary passage 122 in normal time, and on the other hand, opening the primary side passage 121 so as to communicate with the secondary side passage 122 due to a decrease in pressure of the secondary side passage 122 during the occurrence of a fire, detecting pressurized water flowing out when the valve element 22 is opened to transmit an operation signal to an alarm unit. A bypass pipe 27 for bypassing the valve element 22 is provided between the primary side passage 121 and the secondary side passage 122 of the valve element 22, and the bypass pipe 27 is provided with a pressure regulating valve 5 for opening a secondary side of the bypass pipe 27 to a primary side to regulate pressure when the pressure of the secondary side passage 122 with respect to the pressure of the primary side passage 121 of the valve element 22 exceeds preset pressure difference.

Description

  The present invention closes the sprinkler pipe line from the water source to the sprinkler head so that it is normally divided into a primary side and a secondary side, while the primary side is changed to the secondary side due to a pressure drop on the secondary side in the event of a fire. The present invention relates to a flowing water detection device that includes a valve body that is opened so as to communicate with each other and that sends an operation signal to an alarm device when the valve body is opened.

  In general, sprinkler systems installed in buildings and condominiums are equipped with multiple sprinkler pipes that branch from a single water pipe, and in the event of a fire, only the sprinkler pipes of the system whose pressure has dropped due to the operation of the sprinkler head, Water is supplied from the water pipe.

  That is, each sprinkler pipe is connected to the water supply pipe via the water flow detection device so as to function independently.

This flowing water detection device includes a valve body that is closed so as to partition a sprinkler pipe line into a primary side (supply side) and a secondary side (discharge side) in a normal state. When the sprinkler head is activated and the pressure on the secondary side of the valve body is reduced in the event of a fire, the valve body is opened so that the primary side communicates with the secondary side and water is passed to the sprinkler head. At this time, an operating signal is sent to the alarm device when the valve body is opened.
On the other hand, during normal operation, the fire extinguishing fluid in the sprinkler pipe is almost the same pressure on the primary side serving as the supply side and the secondary side serving as the discharge side, or the secondary side is slightly higher in pressure than the primary side (primary side). ≦ secondary side), and the valve body is kept closed normally. The pressure on the primary side of the valve body is kept constant in a pressure water tank connected to the water pipe.

  By the way, the secondary side of the valve body of the sprinkler pipe is laid in the ceiling space partitioned by the ceiling surface, so that air stays and is easily affected by heat due to temperature rise, especially in summer The fire extinguishing fluid inside may expand due to heat, and the pressure on the secondary side of the valve body may increase significantly. In such a case, if the pressure on the secondary side of the valve body is significantly increased, a load is applied to the piping equipment of the sprinkler pipe and the sprinkler head, and the fire fighting fluid may leak.

  Therefore, conventionally, a pipe communicating with the discharge pipe is connected to the secondary side of the valve body of the sprinkler pipe, and this pipe is opened when the pressure on the secondary side of the valve body exceeds a preset pressure value. It is known that by providing a pressure regulating valve to discharge the fire extinguishing fluid on the secondary side of the valve body from the pipe to the discharge pipe, the pressure increased on the secondary side of the valve body is reduced (patent) Reference 1).

JP 2011-226609 A

  However, in the above-mentioned conventional one, the fire extinguishing fluid on the secondary side of the valve body is discharged from the piping to the discharge pipe when the pressure regulating valve is opened, so that the discharge of the fire extinguishing fluid on the secondary side of the valve body is only open of the pressure regulating valve. Will depend on. In this case, when a malfunction occurs in the pressure regulating valve, the fire extinguishing fluid on the secondary side of the valve body may be excessively discharged to the discharge pipe. In addition, since the pressure regulating valve is opened based only on the pressure on the secondary side of the valve body, the pressure on the primary side of the valve body is changed by the pressure change of the pressurized water caused by the volume change on the secondary side of the valve body due to cold or warm. If it is high, the pressure on the primary side may exceed the pressure on the secondary side by opening the regulating valve.

  As a result, the pressure on the primary side and the pressure on the secondary side of the valve body are reversed to open the valve body, which may cause malfunction of the alarm device.

  The present invention has been made in view of the above points, and an object of the present invention is to prevent a reverse pressure between the primary side pressure and the secondary side pressure due to a malfunction or opening of the pressure regulating valve. An object of the present invention is to provide a running water detection device that can avoid the opening of the body and reliably prevent malfunction of an alarm device.

  In order to achieve the above-mentioned object, the present invention closes the sprinkler pipe line so that it is divided into a primary side and a secondary side in a normal state, while the primary side is moved to the secondary side due to a pressure drop on the secondary side in the event of a fire. It is premised on a flowing water detection device that is provided with a valve body that is opened so as to communicate with the alarm valve and that sends an operation signal to an alarm device when the valve body is opened. And while providing the bypass pipe which bypasses the said valve body between the pipe line of the primary side of the said valve body, and a secondary side, the pressure of the secondary side with respect to the pressure of the primary side of the said valve body is provided in the said bypass pipe Is provided with a pressure regulating valve for regulating the pressure by opening the secondary side of the bypass pipe to the primary side of the bypass pipe when the pressure exceeds a preset pressure difference.

  Further, the pressure regulating valve is provided in a communication chamber in which a primary side and a secondary side of the bypass pipe communicate with each other, and a pressure regulating valve body that closes the secondary side communication port from the primary side, and the pressure regulating valve body There is provided an urging means for urging the communication port on the secondary side of the communication chamber in the valve closing direction. The biasing means opens the pressure regulating valve body against the biasing force in the valve closing direction when the pressure on the secondary side with respect to the pressure on the primary side of the valve body exceeds the pressure difference. Is preferred.

  Moreover, it is preferable that the bypass pipe is provided with a capturing unit that captures foreign matter from the secondary side of the bypass pipe on the secondary side of the pressure regulating valve.

  Moreover, it is preferable that the bypass pipe is provided with an open / close valve that opens and closes the pipeline on the primary side with respect to the pressure regulating valve and on the secondary side with respect to the capturing means.

  Furthermore, it is preferable that the bypass pipe is provided with a primary pressure detecting means for detecting the pressure on the primary side of the valve body and a secondary pressure detecting means for detecting the pressure on the secondary side of the valve body.

  In short, in short, a bypass pipe that bypasses the valve body is provided between the primary and secondary sides of the valve body, and the pressure on the secondary side with respect to the pressure on the primary side of the valve body is previously set in the bypass pipe. By providing a pressure control valve that adjusts the pressure by opening the secondary side of the bypass pipe to the primary side when the pressure difference exceeds the set pressure difference, the fire extinguishing fluid on the secondary side of the valve element is discharged to the primary side when the pressure control valve is opened. Will be. For this reason, when the pressure regulating valve is opened, the primary side pressure always acts on the fire extinguishing fluid on the secondary side of the valve body, and the pressure on the primary side and the secondary side pressure due to malfunction or opening of the pressure regulating valve It is possible to prevent the valve element from being opened by prohibiting reverse rotation with the pressure, and to reliably prevent the malfunction of the alarm device.

  Further, a biasing means for biasing the pressure regulating valve body in the communication chamber from the primary side to the secondary side communication opening in the valve closing direction is provided, and by this biasing means, the secondary side with respect to the pressure on the primary side of the valve body is provided. The secondary side pressure relative to the primary side pressure of the valve body is preset by opening the secondary side communication port of the communication chamber against the biasing force when the pressure of the valve exceeds the preset pressure difference If the pressure difference is exceeded, the pressure regulating valve opens against the urging force of the urging means, and the pressure increased on the secondary side of the valve body can be automatically reduced.

  In addition, by providing a capture means that captures foreign matter from the secondary side of the bypass pipe on the secondary side of the pressure regulating valve of the bypass pipe, it is possible to prevent intrusion of foreign matter into the pressure regulating valve and to prevent malfunction of the pressure regulating valve. Can be avoided.

  In addition, an on-off valve that opens and closes the pipeline on the primary side of the pressure regulating valve and on the secondary side of the capturing means is provided on the bypass pipe, so that the on-off valve is closed during maintenance and replacement of the pressure regulating valve and the capturing means. Thus, the flow of the fire-extinguishing fluid from the primary side and the secondary side of the valve body can be prevented, and the maintenance operation and the replacement operation of the pressure regulating valve and the capturing means can be performed smoothly. In addition, by closing only the secondary on-off valve of both the on-off valves, the flow of the fire-extinguishing fluid to the bypass pipe is shut off, and air stays in the space behind the ceiling and the influence of heat due to the rise in temperature The flowing water detection device can be returned to the normal state and used in seasons other than the summer when it is easily affected.

  Further, by providing primary and secondary pressure detection means for detecting the pressure on the primary side and secondary side of the valve body in the bypass pipe, respectively, the primary side and secondary side pressure detection means are individually connected to the sprinkler pipe. There is no need to provide in the pipeline, and the primary side and secondary side pressure detection means can be provided by using the bypass pipe.

It is a lineblock diagram showing roughly the sprinkler system provided with the flowing water detector concerning a 1st embodiment of the present invention. It is sectional drawing which shows the structure of the flowing water detection apparatus of FIG. It is a side view of the pressure regulation valve provided in the bypass pipe of the flowing water detection apparatus of FIG. It is sectional drawing in the XX line of FIG. It is sectional drawing which shows the structure of the flowing water detection apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the structure of the flowing water detection apparatus which concerns on the 3rd Embodiment of this invention. It is sectional drawing of the pressure regulation valve which concerns on the modification of each embodiment. It is sectional drawing of the pressure regulation valve which concerns on the other modification of each embodiment. It is sectional drawing of the pressure regulation valve which concerns on the other modification of each embodiment.

  Hereinafter, the present invention will be described in detail based on illustrated embodiments.

  FIG. 1 is a configuration diagram schematically showing a sprinkler system including a water flow detection device according to a first embodiment of the present invention, and 2 is a water flow detection device. This flowing water detection device 2 is incorporated into a sprinkler system and used.

  First, a sprinkler system in which the water flow detection device 2 of the present invention is used will be briefly described. In general, a sprinkler system has a plurality of sprinkler tubes 12, In the event of a fire, water is passed only through the sprinkler pipe 12 of the system whose pressure has been reduced by the operation of the sprinkler heads 13, 13,. Therefore, the sprinkler heads 13, 13,... Are opened to the respective water supply pipes 11 by reducing the pressure on the end side of the sprinkler pipes 12 so that each sprinkler pipe 12 functions independently. Simultaneously with the water flow, the water flow detection device 2 is provided in conjunction with the water flow to send an operation signal to the sprinkler pump 14 and the alarm device 15 of the system through which water has passed.

  FIG. 2 is a cross-sectional view showing the configuration of the flowing water detection device 2. The flowing water detection device 2 includes a valve body housing 20 interposed in a pipe line of a sprinkler pipe 12 connected to the water supply pipe 11, and And a valve body 22 for opening and closing a flow passage 21 provided in the valve body housing 20. The valve body 22 rotates around the shaft 25 supported in the valve body housing 20 and the valve body section 24 that is seated when the valve seat section 23 provided in the valve body housing 20 is closed. And an arm 26 that is moved to open and close the flow passage 21. In this case, the valve body housing 20 is interposed between the primary pipe 121 on the water supply pipe 11 side of the sprinkler pipe 12 and the secondary pipe 122 on the sprinkler head 13 side, and is fastened by a plurality of bolts 201 and nuts 202. Has been.

  The sprinkler tube 12 is filled with pressurized water (extinguishing fluid). The pressurized water is supplied to the primary pipe 121 (shown by A in FIG. 2) on the water supply pipe 11 side and the secondary pipe 122 (shown by B in FIG. 2) on the sprinkler head 13 side at substantially the same pressure or two. The secondary side pipe 122 is set to have a higher pressure (A ≦ B) than the primary side pipe 121. Therefore, the valve body 22 pivotally attached to the shaft 25 is normally maintained in the closed state shown in FIG. Note that the pressure of the pressurized water in the primary side pipe 121 is kept constant in the pressure water tank 16 connected to the water supply pipe 11.

  An intermediate chamber communicating with a signal water channel (not shown) is opened in the valve seat portion 23 on which the valve body portion 24 is seated. This signal water channel communicates with the inside of the three-way pipe 33 via a signal stop valve 32. The three-way pipe 33 is connected to the signal stop valve 32 and is connected to the drain pipe 10 via the drain section 34. The three-way pipe 33 is connected to the base end (upstream end) of a pressure switch mounting pipe 36 having a warning pressure switch 35 attached to the tip (downstream end). A check valve (not shown) for preventing the backflow of water from the drainage section 34 (drainage pipe 10) is provided on the drainage section 34 side of the three-way pipe 33. Further, in the sprinkler system, when it is necessary to drain the water in the sprinkler pipe 12 due to inspection or replacement of the sprinkler head 13, the control valve 37 provided in the primary side pipe 121 of the sprinkler pipe 12 of the system performing the work. Is closed, and the water supply from the primary side pipe 121 is shut off so that the valve element 22 of the water flow detector 2 does not rotate, and in this state, the communication pipe 38 communicating with the secondary side of the sprinkler pipe 12 is provided. By opening the drainage valve 39, the water accumulated in the sprinkler pipe 12 is drained from the drainage part 34 to the drainage pipe 10 via the communication pipe 38. In this case, the downstream end of the drain pipe 10 and the downstream end of the terminal test valve drain pipe 40 are joined together, and the joined water passes through a long joining pipe 41 extending in the lateral direction, and is formed in an outdoor side groove 42. Are discharged.

  Here, the function of the flowing water detection device 2 will be described.

  First, in the event of a fire, when the sprinkler heads 13, 13,... Detect a fire and discharge water, the water pressure in the secondary side pipe 122 is significantly lower than the water pressure in the primary side pipe 121 of the sprinkler pipe 12 (A> B Therefore, the valve body 22 is opened, and the pipe line of the sprinkler pipe 12 is opened. When the pipe body of the sprinkler pipe 12 is opened by the valve body 22, that is, when the valve body 22 is opened, a part of the flowing water flows into the signal water path through the intermediate chamber, and the water that has flowed in passes through the three-way pipe 33. The alarm pressure switch 35 is activated by flowing into the switch mounting pipe 36. At this time, a part of the water is discharged to the drainage part 34 through the three-way pipe 33, but the water pressure in the signal water channel 30 is reduced by restricting the discharge of the water to the drainage part 34 by an orifice (not shown). However, the pressure required for the operation of the alarm pressure switch 35 is maintained.

  When the alarm pressure switch 35 is activated in this way, a fire detection signal is sent to the alarm panel 17, the alarm 15 such as a motor siren sounds, and the activation signal of the sprinkler pump 14 is sent to the pump control panel 18. Then, the sprinkler pump 14 is actuated and the water from the water source 19 is sent to the sprinkler heads 13, 13,... Via the water supply pipe 11 and the sprinkler pipe 12, and the watering for fire extinguishing is continued. At this time, the water flow detection device 2 of the other system in which the sprinkler is not operating has a high water pressure in the secondary side pipe 122, so that the valve body 22 does not rotate, and water is supplied to the sprinkler pipe 12 of this system. There is no.

  Further, a bypass pipe 27 that bypasses the valve body 22 is provided between the primary pipe 121 and the secondary pipe 122 of the valve body 22 of the sprinkler pipe 12. One end of the bypass pipe 27 is connected to the secondary side of the valve body 22 of the valve body housing 20, while the other end is connected to the primary side of the valve body 22 of the valve body housing 20. The bypass pipe 27 is provided with a pressure regulating valve 5 that opens and regulates the secondary side of the bypass pipe 27 to the primary side of the bypass pipe 27. In this case, the pressure regulating valve 5 functions as a check valve that restricts the flow of pressurized water from the primary side to the secondary side of the bypass pipe 27 and allows only the flow of pressurized water from the secondary side to the primary side. doing.

  3 is a side view of the pressure regulating valve 5 provided in the bypass pipe 27 of the flowing water detection device, and FIG. 4 is a cross-sectional view taken along line XX of FIG. The pressure regulating valve 5 is provided in the pressure regulating valve housing 50, a communication chamber 53 provided in the pressure regulating valve housing 50, and the primary side and the secondary side of the bypass pipe 27 communicate with each other via communication ports 51 and 52, and the communication chamber A pressure regulating valve body 54 that is slidably provided in 53 and closes the secondary side communication port 52 of the bypass pipe 27 from the communication chamber 53 side (primary side of the bypass pipe 27), and the pressure regulating valve body 54. A compression spring 55 is provided as a biasing means that biases the secondary side communication port 52 of the bypass pipe 27 in the valve closing direction.

  The pressure regulating valve housing 50 includes a bottomed cylindrical primary housing portion 57 formed with a primary passage 56 connected to the primary side of the bypass pipe 27, and a secondary side connected to the secondary side of the bypass pipe 27. A secondary housing portion 59 having a passage 58 is formed, and both housing portions 57 and 59 are connected by a plurality of bolts 60. The communication chamber 53 is formed in the primary side housing part 57, and communicates the primary side and secondary side passages 56 and 58 via the primary and secondary side communication ports 51 and 52. The peripheral edge of the secondary-side communication port 52 bulges out in a substantially spindle shape toward the communication chamber 53.

  The pressure regulating valve body 54 includes a first valve body 62 that contacts the periphery of the communication port 52 on the secondary side via a packing 61, and a second valve body that faces the back surface of the first valve body 62 with a gap. 63. A gap between the first valve body 62 and the second valve body 63 is formed by a spherical body 64 interposed between the valve bodies 62 and 63. The first valve body 62 and the second valve body 63 are provided with communication passages 621 and 631, respectively. In this case, the pressurized water that has flowed into the communication chamber 53 from the primary side of the valve body 22 through the primary side passage 56 flows into the gap between the first valve body 62 and the second valve body 63, and passes through the communication path 621. Via the outer peripheral edge of the communication port 52 on the secondary side and the first valve body 62, and also on the back side of the second valve body 63 via the communication passage 631.

  The compression spring 55 is contracted between the second valve body 63 and a sliding piece 65 provided at the bottom of the primary housing part 57. The sliding piece 65 can be moved back and forth toward the communication chamber 53 by a bolt member 66 inserted from the bottom of the primary housing portion 57, and the urging force of the compression spring 55 with the amount of forward / backward movement by the bolt member 66. Can be adjusted. In this case, the compression spring 55 urges the valve closing direction when the pressure of the secondary side pipe 122 with respect to the pressure of the primary side pipe 121 of the valve body 22 exceeds a preset pressure difference (for example, 0.4 MPa). The pressure regulating valve body 54 is automatically opened against this

  Further, the bypass pipe 27 is provided with a Y-shaped strainer 67 as a capturing means for capturing foreign matter from the secondary side of the bypass pipe 27 on the secondary side of the pressure regulating valve 5. The strainer 67 includes a mesh screen (not shown) inside, and captures foreign matter from the secondary side of the bypass pipe 27.

  Further, the bypass pipe 27 is provided with a first on-off valve 68 that opens and closes the pipe line on the primary side of the pressure regulating valve 5 and a second on-off valve 69 that opens and closes the pipe line on the secondary side of the strainer 67. ing. Further, between the first on-off valve 68 of the bypass pipe 27 and the pressure regulating valve 5, a primary pressure gauge 70 serving as a primary pressure detecting means for detecting the primary pressure of the valve body 22 is connected via a branch pipe 71. Are connected. On the other hand, on the secondary side of the second opening / closing valve 69 of the bypass pipe 27, a secondary side pressure gauge 72 as a secondary side pressure detecting means for detecting the secondary side pressure of the valve body 22 connects the branch pipe 73. Are connected through. Further, the bypass pipe 27 is provided with a third on-off valve 74 that opens and closes the pipe line on the secondary side of the branch pipe 73, that is, on the secondary side of the second on-off valve 69.

  Therefore, in the present embodiment, between the primary pipe 121 and the secondary pipe 122 of the valve body 22, that is, between the primary side and the secondary side of the valve body 22 of the valve body housing 20, A bypass pipe 27 for bypassing the valve body 22 is provided, and the bypass pipe 27 is bypassed when the pressure on the secondary side with respect to the pressure on the primary side of the valve body 22 exceeds a preset pressure difference (for example, 0.4 MPa). Since the pressure regulating valve 5 that automatically opens and regulates the secondary side of the pipe 27 to the primary side is provided, the pressurized water on the secondary side of the valve element 22 is discharged to the primary side when the pressure regulating valve 5 is opened. It will be. For this reason, when the pressure regulating valve 5 is opened, the pressure of the primary side pressurized water always acts on the pressurized water on the secondary side of the valve body 22, and the pressure on the primary side of the valve body 22 due to the malfunction or opening of the pressure regulating valve 5. And the reverse of the pressure on the secondary side can be prohibited to avoid the opening of the valve body 22 and the malfunction of the alarm device 15 can be reliably prevented.

  Further, a compression spring 55 is provided to urge the pressure regulating valve body 54 from the primary side to the valve closing direction with respect to the secondary side communication port 52 of the bypass pipe 27, and the pressure on the primary side of the valve body 22 is provided by the compression spring 55. When the pressure on the secondary side with respect to the pressure exceeds a preset pressure difference, the pressure regulating valve 5 opens on the secondary side of the bypass pipe 27 so as to open the secondary side of the bypass pipe 27 to the primary side against the biasing force. Since the pressure on the secondary side of the valve element 22 increases remarkably and exceeds the preset pressure difference with respect to the pressure on the primary side, the pressure regulating valve 5 resists the biasing force of the compression spring 55. Thus, the increased pressure on the secondary side of the valve body 22 can be automatically reduced.

  Further, since a strainer 67 for capturing foreign matter from the secondary side of the bypass pipe 27 is provided on the secondary side of the pressure regulating valve 5 of the bypass pipe 27, it is possible to prevent foreign matter from entering the pressure regulating valve 5. The malfunction of the pressure regulating valve 5 can be effectively avoided.

  Further, since the bypass pipe 27 is provided with the first and second on-off valves 68 and 69 for opening and closing the pipelines on the primary side with respect to the pressure regulating valve 5 and on the secondary side with respect to the strainer 67, the pressure regulating valve 5 and the strainer are provided. The first and second on-off valves 68 and 69 are closed during maintenance and replacement of the 67 to prevent the flow of pressurized water from the primary side and the secondary side of the valve body 22, and the pressure regulating valve 5 and the strainer 67 Maintenance work and replacement work can be performed smoothly. Moreover, by closing only the second opening / closing valve 69 on the secondary side, the flow of pressurized water to the bypass pipe 27 is interrupted, and air stays in the space behind the ceiling and is easily affected by heat due to an increase in temperature. The flowing water detection device 2 can be returned to the normal state and used in seasons other than summer.

  Further, since the primary and secondary pressure gauges 70 and 72 for detecting the pressure on the primary side and the secondary side of the valve body 22 are respectively provided in the bypass pipe 27, the primary side and secondary side pressure gauges 70, 72 are provided. 72 does not need to be provided individually in the pipe line of the sprinkler pipe 12, and the primary side and secondary side pressure gauges 70 and 72 can be provided using the bypass pipe 27. Further, during maintenance and replacement of the primary side and secondary side pressure gauges 70, 72, the first and third on-off valves 68, 74 are closed to allow the pressurized water to flow from the primary side and the secondary side of the valve body 22. The maintenance work and replacement work of the primary side and secondary side pressure gauges 70 and 72 can be performed smoothly.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment, the connection location of the bypass pipe 27 is changed. FIG. 5 is a cross-sectional view showing the configuration of the flowing water detection device 2 according to the second embodiment of the present invention. The remaining configuration except for the connecting portion of the bypass pipe 27 is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  That is, in this embodiment, as shown in FIG. 5, the valve body housing 20 is interposed between the primary side pipe 121 and the secondary side pipe 122 of the sprinkler pipe 12 via the spacers 75. . And the connection location with respect to the primary side piping 121 of the bypass pipe 27 is the spacer 75 between the valve body housing 20 and the primary side piping 121, and the connection location with respect to the secondary side piping 122 of the bypass pipe 27 is the valve body housing 20 and the 2nd. Spacers 75 between the secondary pipes 122 are provided. In this case, since the valve body housing 20 is interposed between the primary pipe 121 on the water supply pipe 11 side of the sprinkler pipe 12 and the secondary pipe 122 on the sprinkler head 13 side via the spacer 75, the spacer 75 It is fastened by a bolt 203 and a nut 202 that are longer than the thickness of the bolt.

  Therefore, in the present embodiment, when connecting the bypass pipe 27, it is not necessary to provide connection openings in the valve body housing 20 and the primary side pipe 121 and the secondary side pipe 122 of the sprinkler pipe 12. The bypass pipe 27 is simply attached in a state where the connection opening is provided in the spacer 75 between the primary side pipe 121 or the secondary side pipe 122, and the versatility of the bypass pipe 27 with respect to the flowing water detection device 2 can be enhanced. .

  Next, a third embodiment of the present invention will be described with reference to FIG.

  In the third embodiment, the connection location of the bypass pipe 27 is changed. FIG. 6: has shown sectional drawing which shows the structure of the flowing water detection apparatus based on the 3rd Embodiment of this invention. The remaining configuration except for the connecting portion of the bypass pipe 27 is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  That is, in this embodiment, as shown in FIG. 6, the connecting part on the primary side pipe 121 side of the bypass pipe 27 is the primary side pipe 121, and the connecting part on the secondary side pipe 122 side of the bypass pipe 27 is the secondary side. Each of the side pipes 122 is provided. The primary pressure gauge 70 is connected to the primary side of the valve body 22 of the valve body housing 20 via the communication passage 271. On the other hand, the secondary side pressure gauge 72 is connected to the secondary side of the valve body 22 of the valve body housing 20 via the communication path 272. A third on-off valve 74 is provided in each of the communication passages 271 and 272, respectively.

  An auxiliary check valve 76 is provided at the center of the valve body 24. The auxiliary check valve 76 has a through hole 77 that penetrates the inside in the axial direction and communicates the primary side and the secondary side of the valve body housing 20, and a spherical ball valve body 78 that opens and closes the through hole 77. And. Inside the through-hole 77, a tapered ring-shaped seat 79 on which the ball valve body 78 is seated when the valve is closed, and a secondary side end (upper end in FIG. 6) of the through-hole 77 are bridged in the diametrical direction. A rod-shaped regulating member 80 that regulates movement of the valve body 78 out of the through-hole 77 when the valve is opened is provided. The auxiliary check valve 76 opens the ball valve body 78 due to a change in pressure of the pressurized water caused by a change in volume on the secondary side due to cold and warm, and the pressurized water from the primary side passage 56 to the secondary side passage 58 is opened. Distribution is possible.

  Therefore, in the present embodiment, the third on-off valve 74 of the corresponding communication passages 271 and 272 is closed during maintenance and replacement of the primary side and secondary side pressure gauges 70 and 72 to the communication passages 271 and 272, respectively. Therefore, the maintenance work and the exchange work of the primary side and secondary side pressure gauges 70 and 72 can be easily performed.

  In addition, since the auxiliary check valve 76 is provided in the valve body portion 24, the pressurized water from the primary side passage 56 to the secondary side passage 58 due to the pressure change of the pressurized water caused by the volume change on the secondary side due to cold and warm, etc. Accordingly, the pressure of the pressurized water in the primary side passage 56 and the secondary side passage 58 can be kept optimal in combination with the pressure regulating valve 5 of the bypass pipe 27.

The present invention is not limited to the above-described embodiments, and includes other various modifications. For example, in each of the above embodiments, the pressure regulating valve body 54 of the pressure regulating valve 5 is configured by the first valve body 62, the second valve body 63, and the spherical body 64 interposed between the both valve bodies 62, 63. As shown in FIG. 7, the pressure regulating valve 5 may be configured by a single pressure regulating valve body 84.
Specifically, the tip end of the pressure regulating valve body 84 is formed in a substantially conical shape that can be sealed against an annular packing 85 provided at the periphery of the communication port 52 on the secondary side of the bypass pipe 27. Further, the compression spring 55 is contracted between the pressure regulating valve body 84 and the sliding piece 65. The pressure regulating valve body 84 is provided with a communication passage 841, and the pressurized water flowing into the communication chamber 53 from the primary side of the valve body 22 through the primary side passage 56 is supplied to the secondary side communication port 52 through the communication passage 841. You may make it distribute | circulate between the periphery and the front-end | tip of the pressure regulation valve body 84, or the back surface side of the pressure regulation valve body 84. FIG.

  Further, as shown in FIG. 8, the pressure regulating valve 5 is constituted by a single pressure regulating valve body 86, and the tip of the pressure regulating valve body 86 is formed in a substantially conical shape so that the communication on the secondary side of the bypass pipe 27 is performed. The periphery of the mouth 52 is also formed in a tapered surface that is inclined at the same angle as the tip of the pressure regulating valve body 86. An annular recess 88 is provided at the tip of the pressure regulating valve body 86 to accommodate an annular packing 87 that contacts and seals against the peripheral edge of the communication port 52 on the secondary side of the bypass pipe 27. Further, the pressure regulating valve body 86 is also provided with a communication passage 861, and the pressurized water flowing into the communication chamber 53 from the primary side of the valve body 22 through the primary side passage 56 is connected to the secondary side communication port 52 through the communication path 861. Between the peripheral edge of the pressure regulating valve body 86 and the tip of the pressure regulating valve body 86, or also on the back side of the pressure regulating valve body 86.

  Further, as shown in FIG. 9, the pressure regulating valve 5 is constituted by a single pressure regulating valve body 89 formed in a bottomed cylindrical shape, and the tip on the bottom side of the pressure regulating valve body 89 is connected to the bypass pipe 27. It is formed in a substantially conical shape that can be in contact with and sealed against the annular packing 85 at the periphery of the communication port 52 on the secondary side. Further, a rod member 90 passing through the axis of the bolt member 66 is inserted into the distal end side of the bolt member 66, and the distal end of the rod member 90 is brought into contact with the distal end of the inner peripheral surface of the pressure regulating valve body 89, while the pressure regulating valve body is disposed in the middle portion A flange 91 is provided that is fixed to the back surface of 89 with a gap. Then, the compression spring 55 is contracted between the sliding piece 65 through which the rod member 90 slidably passes and the flange portion 91 of the rod member 90. Further, a communication passage 911 is also provided in the flange 91, and pressurized water flowing into the communication chamber 53 from the primary side of the valve body 22 through the primary side passage 56 is supplied to the secondary side communication port 52 through the communication passage 891. It may be circulated between the peripheral edge and the tip of the pressure regulating valve body 89 or on the back side of the pressure regulating valve body 89, and may also be circulated on the back side of the flange portion 91 via the communication path 911. In this case, the urging force of the compression spring 55 is adjusted in accordance with the amount of movement of the sliding piece 65 by the bolt member 66 and acts on the flange 91, and the tip of the rod member 90 makes the tip of the pressure regulating valve body 89 the annular packing. It is possible to exert high sealing performance against the communication port 52 on the secondary side of the bypass pipe 27 by efficiently pressing against the pressure 85.

  In each of the above embodiments, pressurized water obtained by pressurizing water from the water source 19 is used as a fire extinguishing fluid. However, a fire extinguishing fluid obtained by adding a chemical and then mixing after pressurizing water stored in the water source is used. Needless to say.

  In each of the above embodiments, part of the fire extinguishing fluid that flows out when the valve body 22 is opened flows to activate the alarm pressure switch 35, and sends a fire detection signal to the alarm panel 17 to sound the alarm 15. In addition, the case of applying to the automatic alarm valve type flowing water detection device 2 for sending the activation signal of the sprinkler pump 14 to the pump control panel 18 has been described, but the oscillation is caused by the flowing water flowing out to the secondary side when the valve body is opened. In this way, a fire detection signal is sent to the alarm panel and the alarm is sounded, and a sprinkler pump start signal is sent to the pump control panel. A fire detection signal is sent to the alarm panel based on the opening posture of the valve body pivotally attached through the shaft when the valve body is opened or the rotation amount of the shaft, etc. It may be applied to the actuation valve-type water flow detection device which is adapted to deliver an activation signal sprinkler pump to the control panel.

  Further, in each of the above embodiments, the bypass pipe 27 is adjusted against the biasing force of the compression spring 55 when the pressure on the secondary side with respect to the pressure on the primary side of the valve element 22 exceeds a preset pressure difference. The pressure regulating valve 5 that automatically opens and regulates the secondary side of the bypass pipe 27 to the primary side by opening the pressure valve bodies 54, 84, 86, and 89 is provided. There is a pressure regulating valve such as an open / close valve that manually opens the secondary side of the bypass pipe to the primary side of the bypass pipe when the pressure on the secondary side with respect to the pressure on the side exceeds a preset pressure difference. It may be. In this case, manually open the pressure regulating valve periodically (for example, during the daytime when the temperature rises most) during the summer season when the air stays in the space behind the ceiling and is susceptible to heat due to temperature rise. You can do it.

12 Sprinkler pipe 121 Primary pipe (primary pipe line)
122 Secondary piping (secondary piping)
DESCRIPTION OF SYMBOLS 15 Alarm 2 Flowing water detection apparatus 22 Valve body 27 Bypass pipe 5 Pressure regulation valve 52 Secondary side communication port 53 Communication chamber 54 Pressure regulation valve body 55 Compression spring (biasing means)
67 Strainer (capture means)
68 1st on-off valve 69 2nd on-off valve 70 Primary side pressure gauge (primary side pressure detection means)
72 Secondary pressure gauge (secondary pressure detector)
74 Third on-off valve 84 Pressure regulating valve body 86 Pressure regulating valve body 89 Pressure regulating valve body

In order to achieve the above object, the solution provided by the present invention is to close the sprinkler pipe line so that it is divided into a primary side and a secondary side in a normal state, while the primary side is reduced by a pressure drop on the secondary side in the event of a fire. It is premised on a flowing water detection device that includes a valve body that is opened so as to communicate with the secondary side, and that an operation signal is sent to the alarm device when the valve body is opened. Further, a valve body housing that accommodates the valve body is interposed between a primary side and a secondary side of the pipe line, and the primary side of the valve body housing is closer to the primary side than the valve body. The primary side pressure detecting means for detecting the pressure of the secondary side is connected via the branch pipe, and the secondary side of the valve body housing detects the secondary side pressure further to the secondary side than the valve body. The side pressure detection means is connected via the branch pipe. And each said branch pipe is provided with the 1st and 3rd on-off valve which opens and closes individually the primary side of said primary side pressure detection means, and the secondary side pipe of said secondary side pressure detection means, respectively, More than the first on-off valve that opens and closes the primary side of the primary pressure detection means and the third on-off valve that opens and closes the pipe on the side of the primary pressure detection means and the secondary side of the secondary pressure detection means. A bypass pipe that bypasses the valve body is connected to a pipe line on the secondary pressure detection means side. Further, the secondary side of the bypass pipe is opened to the primary side of the bypass pipe when the secondary side pressure with respect to the primary side pressure of the valve body exceeds a preset pressure difference in the bypass pipe. A pressure regulating valve that regulates pressure and a second on-off valve that opens and closes the pipe line on the secondary side of the pressure regulating valve are provided.

In order to achieve the above object, the other solution provided by the present invention is to close the sprinkler pipe line so that it is divided into a primary side and a secondary side in a normal state, while the secondary side is closed in the event of a fire. Similarly, a flow detection device is provided on the assumption that a valve body that is opened so that the primary side communicates with the secondary side due to a pressure drop and that an operation signal is sent to the alarm device when the valve body is opened. Furthermore, it is interposed between the primary side and the secondary side of the pipe line, and is interposed between the valve body housing for accommodating the valve body, and the primary side of the pipe line and the valve body housing. A primary side spacer, and a secondary side spacer interposed between the secondary side of the conduit and the valve body housing. Further, a primary side pressure detecting means for detecting a primary side pressure of the pipe line is connected to the primary side spacer via a branch pipe, and the secondary side spacer is connected to the secondary side of the pipe line. Secondary pressure detecting means for detecting the pressure on the secondary side is connected via a branch pipe. And each said branch pipe is provided with the 1st and 3rd on-off valve which opens and closes individually the primary side of said primary side pressure detection means, and the secondary side pipe of said secondary side pressure detection means, respectively, More than the first on-off valve that opens and closes the primary side of the primary pressure detection means and the third on-off valve that opens and closes the pipe on the side of the primary pressure detection means and the secondary side of the secondary pressure detection means. A bypass pipe that bypasses the valve body is connected to the pipe line on the secondary pressure detection means side. Further, the secondary side of the bypass pipe is opened to the primary side of the bypass pipe when the secondary side pressure with respect to the primary side pressure of the valve body exceeds a preset pressure difference in the bypass pipe. A pressure regulating valve that regulates pressure and a second on-off valve that opens and closes the pipe line on the secondary side of the pressure regulating valve are provided.

Moreover, it is preferable to provide a capturing means for capturing foreign matter from the secondary side of the bypass pipe between the pressure regulating valve and the second on-off valve in the bypass pipe.

Further, the pressure regulating valve is provided in a communication chamber in which a primary side and a secondary side of the bypass pipe communicate with each other, and a pressure regulating valve body that closes the secondary side communication port from the primary side, and the pressure regulating valve body There is provided an urging means for urging the communication port on the secondary side of the communication chamber in the valve closing direction. The biasing means opens the pressure regulating valve body against the biasing force in the valve closing direction when the pressure on the secondary side with respect to the pressure on the primary side of the valve body exceeds the pressure difference. Is preferred.

Further, the communication chamber is provided in a primary housing portion where a primary communication port of the bypass pipe opens. Then, the urging means is mounted between the pressure regulating valve body and a sliding piece that slides with respect to the communication chamber side by a forward / backward movement of a bolt member inserted from the bottom of the primary housing portion. It is preferable that the urging force in the valve closing direction of the pressure regulating valve body with respect to the communication port on the secondary side of the communication chamber can be adjusted.

It is a lineblock diagram showing roughly the sprinkler system provided with the flowing water detector concerning a 1st embodiment of the present invention. It is sectional drawing which shows the structure of the flowing water detection apparatus of FIG. It is a side view of the pressure regulation valve provided in the bypass pipe of the flowing water detection apparatus of FIG. It is sectional drawing in the XX line of FIG. It is sectional drawing which shows the structure of the flowing water detection apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the structure of the flowing water detection apparatus which concerns on a reference example . It is sectional drawing of the pressure regulation valve which concerns on the modification of each embodiment. It is sectional drawing of the pressure regulation valve which concerns on the other modification of each embodiment. It is sectional drawing of the pressure regulation valve which concerns on the other modification of each embodiment.

Next, a reference example will be described with reference to FIG.

In this reference example , the connection location of the bypass pipe 27 is changed. FIG. 6: has shown sectional drawing which shows the structure of the flowing water detection apparatus which concerns on a reference example . The remaining configuration except for the connecting portion of the bypass pipe 27 is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

That is, in this reference example , as shown in FIG. 6, the connecting part on the primary side pipe 121 side of the bypass pipe 27 is the primary side pipe 121, and the connecting part on the secondary side pipe 122 side of the bypass pipe 27 is the secondary side. Each of the pipes 122 is provided. The primary pressure gauge 70 is connected to the primary side of the valve body 22 of the valve body housing 20 via the communication passage 271. On the other hand, the secondary side pressure gauge 72 is connected to the secondary side of the valve body 22 of the valve body housing 20 via the communication path 272. A third on-off valve 74 is provided in each of the communication passages 271 and 272, respectively.

Therefore, in this reference example , at the time of maintenance and replacement of the primary side and secondary side pressure gauges 70 and 72, the third on-off valve 74 of the corresponding communication passages 271 and 272 is closed, respectively, to the communication passages 271 and 272. The flow of pressurized water can be prevented, and the maintenance work and replacement work of the primary side and secondary side pressure gauges 70 and 72 can be easily performed.

12 Sprinkler pipe 121 Primary pipe (primary pipe line)
122 Secondary piping (secondary piping)
15 Alarm 2 Flowing water detector
20 valve body housing 22 valve body 27 bypass pipe 5 pressure regulating valve 52 secondary side communication port 53 communication chamber 54 pressure regulating valve body 55 compression spring (biasing means)
65 sliding pieces
66 bolt member 67 strainer (capturing means)
68 1st on-off valve 69 2nd on-off valve 70 Primary side pressure gauge (primary side pressure detection means)
72 Secondary pressure gauge (secondary pressure detector)
74 3rd on-off valve
75 spacers (primary and secondary spacers)
84 Pressure regulating valve body 86 Pressure regulating valve body 89 Pressure regulating valve body

In order to achieve the above object, the solution provided by the present invention is to close the sprinkler pipe line so that it is divided into a primary side and a secondary side in a normal state, while the primary side is reduced by a pressure drop on the secondary side in the event of a fire. Similarly, a flow detection device is provided on the assumption that a valve body that is opened so as to communicate with the secondary side is communicated and an operation signal is sent to the alarm device when the valve body is opened. Furthermore, it is interposed between the primary side and the secondary side of the pipe line, and is interposed between the valve body housing for accommodating the valve body, and the primary side of the pipe line and the valve body housing. A primary side spacer, and a secondary side spacer interposed between the secondary side of the conduit and the valve body housing. Further, a primary side pressure detecting means for detecting a primary side pressure of the pipe line is connected to the primary side spacer via a branch pipe, and the secondary side spacer is connected to the secondary side of the pipe line. Secondary pressure detecting means for detecting the pressure on the secondary side is connected via a branch pipe. And each said branch pipe is provided with the 1st and 3rd on-off valve which opens and closes individually the primary side of said primary side pressure detection means, and the secondary side pipe of said secondary side pressure detection means, respectively, More than the first on-off valve that opens and closes the primary side of the primary pressure detection means and the third on-off valve that opens and closes the pipe on the side of the primary pressure detection means and the secondary side of the secondary pressure detection means. A bypass pipe that bypasses the valve body is connected to the pipe line on the secondary pressure detection means side. Further, the secondary side of the bypass pipe is opened to the primary side of the bypass pipe when the secondary side pressure with respect to the primary side pressure of the valve body exceeds a preset pressure difference in the bypass pipe. A pressure regulating valve that regulates pressure and a second on-off valve that opens and closes the pipe line on the secondary side of the pressure regulating valve are provided.

It is a block diagram which shows roughly the sprinkler system provided with the flowing water detection apparatus which concerns on the reference example 1 of this invention. It is sectional drawing which shows the structure of the flowing water detection apparatus of FIG. It is a side view of the pressure regulation valve provided in the bypass pipe of the flowing water detection apparatus of FIG. It is sectional drawing in the XX line of FIG. It is sectional drawing which shows the structure of the flowing water detection apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the structure of the flowing water detection apparatus which concerns on the reference example 2 of this invention . It is sectional drawing of the pressure regulation valve which concerns on the modification of embodiment . It is sectional drawing of the pressure regulation valve which concerns on the other modification of embodiment . It is sectional drawing of the pressure regulation valve which concerns on the other modification of embodiment .

FIG. 1 is a configuration diagram schematically showing a sprinkler system including a running water detection device according to Reference Example 1 of the present invention, and 2 is a running water detection device. This flowing water detection device 2 is incorporated into a sprinkler system and used.

Therefore, in this reference example 1 , between the primary pipe 121 and the secondary pipe 122 of the valve body 22, that is, between the primary side and the secondary side of the valve body 22 of the valve body housing 20, A bypass pipe 27 for bypassing the valve body 22 is provided, and the bypass pipe 27 is bypassed when the pressure on the secondary side with respect to the pressure on the primary side of the valve body 22 exceeds a preset pressure difference (for example, 0.4 MPa). Since the pressure regulating valve 5 that automatically opens and regulates the secondary side of the pipe 27 to the primary side is provided, the pressurized water on the secondary side of the valve element 22 is discharged to the primary side when the pressure regulating valve 5 is opened. It will be. For this reason, when the pressure regulating valve 5 is opened, the pressure of the primary side pressurized water always acts on the pressurized water on the secondary side of the valve body 22, and the pressure on the primary side of the valve body 22 due to the malfunction or opening of the pressure regulating valve 5. And the reverse of the pressure on the secondary side can be prohibited to avoid the opening of the valve body 22 and the malfunction of the alarm device 15 can be reliably prevented.

Next, the implementation of the embodiment of the present invention will be described with reference to FIG.

The implementation in the form of this, have changed the connection point of the bypass pipe 27. Figure 5 is a cross-sectional view showing the configuration of a water flow detection device 2 according to the implementation of the embodiment of the present invention. The rest of the configuration except for the connecting portion of the bypass pipe 27 is the same as that of the first reference example , and the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

Next, Reference Example 2 of the present invention will be described with reference to FIG.

In this reference example 2 , the connection location of the bypass pipe 27 is changed. FIG. 6 is a cross-sectional view showing the configuration of the flowing water detection apparatus according to Reference Example 2 . The rest of the configuration except for the connecting portion of the bypass pipe 27 is the same as that of the first reference example , and the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

The present invention is not limited to the embodiments and reference examples before you facilities, and includes a variety of other modification. For example, in the reference example 1 , the pressure regulating valve body 54 of the pressure regulating valve 5 is configured by the first valve body 62, the second valve body 63, and the spherical body 64 interposed between the both valve bodies 62, 63. As shown in FIG. 7, the pressure regulating valve 5 may be constituted by a single pressure regulating valve body 84.
Specifically, the tip end of the pressure regulating valve body 84 is formed in a substantially conical shape that can be sealed against an annular packing 85 provided at the periphery of the communication port 52 on the secondary side of the bypass pipe 27. Further, the compression spring 55 is contracted between the pressure regulating valve body 84 and the sliding piece 65. The pressure regulating valve body 84 is provided with a communication passage 841, and the pressurized water flowing into the communication chamber 53 from the primary side of the valve body 22 through the primary side passage 56 is supplied to the secondary side communication port 52 through the communication passage 841. You may make it distribute | circulate between the periphery and the front-end | tip of the pressure regulation valve body 84, or the back surface side of the pressure regulation valve body 84. FIG.

Further, in the embodiments and reference examples before you facilities, but utilizing pressurized water pressurized water water source 19 as fire-extinguishing fluid, which is mixed with the addition of agents after pressurizing the water reserved in the water source extinguishing Needless to say, a fluid may be used.

Also, before the form of you facilities and the reference examples, to actuate the alarm pressure switch 35 flows a portion of the fire extinguishing fluid flowing upon opening of the valve body 22, and transmits the fire detection signal to the alarm panel 17 The case where the alarm device 15 is sounded and applied to the automatic alarm valve type water flow detection device 2 which sends the start signal of the sprinkler pump 14 to the pump control panel 18 has been described. A paddle type with a check valve structure that sends a fire detection signal to the alarm panel by swinging with the flowing water to make the alarm sound and also sends a sprinkler pump start signal to the pump control panel A fire detection signal is sent to the alarm panel based on the opening posture of the valve body that is pivotally pivoted through the shaft when the valve body is opened, or the amount of shaft rotation, etc., and the alarm is sounded If you let It may be applied to the actuation valve-type water flow detection device which is adapted to deliver an activation signal sprinkler pump to the pump control panel.

Further, in the embodiments and reference examples before you facilities, the bypass pipe 27, the biasing force of the compression spring 55 when above the pressure difference the pressure in the secondary side is preset for the pressure on the primary side of the valve body 22 The pressure regulating valve body 54, 84, 86, 89 is opened against the pressure to provide a pressure regulating valve 5 that automatically opens and regulates the secondary side of the bypass pipe 27 to the primary side. An open / close valve that manually adjusts the pressure by opening the secondary side of the bypass pipe to the primary side of the bypass pipe when the pressure on the secondary side with respect to the pressure on the primary side of the valve body exceeds a preset pressure difference. A pressure regulating valve may be provided. In this case, manually open the pressure regulating valve periodically (for example, during the daytime when the temperature rises most) during the summer season when the air stays in the space behind the ceiling and is susceptible to heat due to temperature rise. You can do it.

Claims (5)

Equipped with a valve element that closes the sprinkler pipe line so that it is divided into a primary side and a secondary side at normal times, and opens the primary side to communicate with the secondary side due to a pressure drop on the secondary side in the event of a fire. In the flowing water detection device that sends an operation signal to the alarm device when the valve body is opened,
Between a pipe line between the primary side and the secondary side of the valve body, a bypass pipe that bypasses the valve body is provided,
The bypass pipe is adjusted by opening the secondary side of the bypass pipe to the primary side of the bypass pipe when the pressure on the secondary side with respect to the pressure on the primary side of the valve body exceeds a preset pressure difference. A flowing water detection device characterized in that a pressure regulating valve is provided. The pressure regulating valve is provided in a communication chamber in which a primary side and a secondary side of the bypass pipe communicate with each other, and a pressure regulating valve body that closes a communication port on the secondary side from the primary side; An urging means for urging the communication port on the secondary side of the chamber in the valve closing direction;
The biasing means opens the pressure regulating valve body against a biasing force in a valve closing direction when a secondary pressure with respect to a primary pressure of the valve body exceeds the pressure difference. Item 10. The flowing water detection device according to Item 1.   The flowing water detection device according to claim 1, wherein the bypass pipe is provided with a capturing unit that captures foreign matter from the secondary side of the bypass pipe on the secondary side of the pressure regulating valve.   The flowing water detection device according to claim 3, wherein the bypass pipe is provided with an opening / closing valve that opens and closes a pipe line on the primary side of the pressure regulating valve and on the secondary side of the capturing unit.   The said bypass pipe is provided with the primary side pressure detection means which detects the pressure of the primary side of the said valve body, and the secondary side pressure detection means which detects the pressure of the secondary side of the said valve body. The flowing water detection apparatus according to any one of claims 1 to 4.

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