M431714 ' 六、新型說明： 【新型所屬之技術領域】 本創作係關於設置於滅火設備管線之流水檢測裝置。 【先前技術】 流水檢測裝置森設置於灑水頭設備或泡沫滅火設備等 滅火設備管線上’一次側係與給水手段連接，二次側係與 設置有灑水頭之管線連接。滅火設備管線内係充滿水之狀 Φ 態，在因火災而灑水頭作動後立刻從灑水頭放出滅火設備 管線内之水》 以往之流水檢測裝置係呈擺動止回閥式之止回閥構 造，本體内部被隔壁分為一次側室與二次側室。於該隔壁 穿設有連通口，連通口係'呈可藉由受軸支之閥體開閉之構 造。 流水檢測裝置係隨時為閥體被關閉之狀態，連接於二 次侧之m水頭之開放使二次側之壓力降低會使閥體旋動而 從一次側往二次側產生流水。 才欢出此時之閥體之旋動並輸出作骑夕撒雄士 |铜a； k唬之機構有例如記載M431714 ' VI. New description: [New technical field] This creation is about the flow detection device installed in the fire extinguishing equipment pipeline. [Prior Art] The flow detection device is installed on the fire extinguishing equipment line such as sprinkler head equipment or foam fire extinguishing equipment. The primary side is connected to the water supply means, and the secondary side is connected to the line provided with the sprinkler head. The fire-fighting equipment pipeline is filled with water in the shape of Φ, and the water in the fire-fighting equipment pipeline is discharged from the sprinkler head immediately after the sprinkler is activated by the fire. The conventional flow detection device is a swing check valve type check valve structure. The inside of the body is divided into a primary side chamber and a secondary side chamber by a partition wall. A communication port is formed in the partition wall, and the communication port is configured to be opened and closed by a valve body that is supported by the shaft. The flow detecting device is in a state in which the valve body is closed at any time, and the opening of the m-head connected to the secondary side lowers the pressure on the secondary side to cause the valve body to swirl and generate water from the primary side to the secondary side. I only laughed at the rotation of the valve body at this time and output it for the riding of the sacred sage | copper a;
於專利文獻1者。專利文獻丨I ^ ^ ^ 之〜水铋測裝置係將開關操 作用紅動臂從外部插入閥箱内 且開關刼作用旋動臂藉由於 中間认置之水平旋轉軸被設為可自由旋動。 開關操作用旋動臂之閥箱 ^ 9a 側之知係文彈壓手段彈壓 為抵接閥體，於開關操作用旋 鋅由兮斿叙辟, #之外°卩側之端附近設置 籍由違紅動臂之旋動開啟 開關手段，閥體之往開方向之 3 M431714 動作使該旋動臂抵抗彈壓手段之彈壓力而旋動使開關手段 成為開啟並輸出信號。 【專利文獻1】曰本專利第3865745號公報 【新型内容】 上述之流水檢測裝置係於集合住宅用之麗水設備使 用’設置於一般大樓或購物中心之流水檢測裝置比集合住 宅用之灑水設備用之流水檢測裝置閥口徑大，由於濃水頭 作動時閥體開啟之角度極小，故以開關手段難以測得閥體 之開放。 針對此點，在本創作係鑑於上述問題，以提供於間口 役較大之流水檢測裝置亦可檢出閥體之開放導致之旋動並 4吕號輸出之流水檢測裝置為目的。 為達成上述目的，請求項i記載之創作係於設置於滅 火設備管線之流水檢測裝置，内部呈擺動止回閥構造，受 軸支且可自由旋動之閥體隨時為關閉狀態’檢測到閥體之 往開方向之旋動後輸出信號之流水檢測裝置中，從閥箱外 部插通接觸制體周緣突丨設置之卡止部之桿，該桿被轴 支為可藉由閥體之開放而往二次側方向旋動，於突出至閥 箱外部之桿之端附近配置有開關手段，閥體之開放使桿往 二次侧方向旋動使開關手段作動之流水檢測裝置。 根據請求項2之創作，係於前述流水檢測裝置中，浐 之閥箱内側之端受彈壓手段往閥體開啟方向彈壓之請求: 1記载之流水檢測裝置。 月、 丄/丄4 根據請求項3夕名丨从 壓手段設置* ’係於前述流水檢測裴置中，彈 又置於-之突出至閥箱外部之側之請求項 流水檢測裝置。 5己載之 根據請求項4之創作，係於 閥體之閥座抵接面形成有往 ^ 』裝置中，於 之气項W 側延伸之金屬製之突出部 之吻求項1记載之流水檢測裝置。 根據請求項5之創作，係於前述流水檢測裝置中，卡 止部係設於從閥體之中心轴 $置中’卡 流水檢測裝置。 m置之-求項！記載之 根據請求項6之創作，係於前述流水檢測裝置中，卡 止部之桿接觸之面被設為對向於閱座面之 流水檢測裝置。 ^ ί 5己載之 根據叫求項7之創作，係於前述流水檢測裝置 止部具備使開閥後彳主-·Α彳日丨+ 1 灸…人側方向旋動之桿返回閉閥時之原 取手段之請求項1記載之流水檢測裝置。 根據請求項8之創作，係於前述流水檢測裳置中，在 以設置有封閉閥箱之開口部之蓋部之面為正面時，前述桿 係突出於流水檢測裝置之也 料裝置之側面，於桿之近側設置有排水閥 之Μ求項1記載之流水檢測裝置。 根據《月求項9之創作，係於前述流水檢測裝置 以設置有封閉閱箱之開口部之蓋部之面為正面日夺 二 及排水閥係配置於流水檢測裝置之-個側面之請求項8 : 載之流水檢測裝置。 °己 根據本創作，設置-端接觸於閥體之周緣突出設置之 M431714 卡止部之桿，於桿與閥體之周緣間形成間隔，可防止在閥 體，開閉動作時桿夾於閥體與閥座之間。且桿之閥箱内側 之端受彈壓手段往閥體開啟方向彈壓，於閥體僅稀微開啟 時桿亦可追隨旋動》 【實施方式】 本創作之流水檢測裝置中，可使用彈性體或錘、磁石 等做為將閥箱内側之桿端往閥體開啟方向彈壓之彈壓手 段。此外，彈壓手段之設置位置雖可於閥箱内部設置，但 較理想為於桿之被突出至閥箱外部之侧設置。 流水檢測裝置係在設於二次側之灑水頭作動時之放水 使二次側孓壓力減少而於流水檢測裝置之一次側壓力與二 次側壓力產生差壓時閥體開放，檢測該閥體之開放並輸出 信號。灑水頭之喷嘴口徑與流水檢測裝置之閥口徑相比有 大差異，為從一次側追隨二次側壓力減少量而被開啟之閥 體之旋動量為極小。 因此於閥體之閥座抵接面形成被往一次側延伸之突出 部較理想。此外，該突出部亦具有錘之作用，具有於閥體 開放狀態促使閥體往關閉方向之作用。為使發揮錘之作 用’突出部之材料使用金屬材料較理想，具體而言係使用 銅合金或鐵形成。設於閥體之周緣之卡止部若設於從闕體 之中心軸偏心之位置’桿之設置位置亦設於從閥體之中心 軸偏心之位置，藉此可使流水檢測裝置之構成為簡單。具 體而言係於從閥體之中心軸偏心之流水檢測裝置之背面側 M431714 設置桿以使突出於流水檢測裝置之側面，並於桿之近端設 置排水閥以於流水檢測裝置之一個側面接近配置設置於桿 附近之開關手段與排水閥為可能。 此外，若將卡止部之桿接觸之面設於對向於闕座面之 位置，於閉間時闕箱内側之桿端往間體開 卡止部阻止。反之，於開放狀態之間„_，J = 將已旋動往二次側方向之狀態之桿端往原本之位置誘導以 復原。 # 【實施例】 以下，參照圖i至圖4說明此創作之實施例。圖i為 本創作之流水檢測裝置之剖面圖。2為本創作之流水檢 測裝置之平面圖。圖3為圖剖面圖。w 4為圖2 之Y-Y剖面圖。目5為圖4中之間體開放之狀態。 本創作之流水檢測裝置係由本體丨、閥開檢測部A、排 水閥B構成。 ,、本體1係呈於上下具備凸緣2、2之中空形狀，於内部 形成有區刀一次側〗與二次側π之隔壁3。於隔壁3穿設有 連通口 4,於連通口 4之二次側“面設置有圓筒形狀之 閥座5。 之上載置有閥體6,於閥體6之緣之—部設置 有形成有與閥座5之閥體座面5Α平行之筒之轴承7，於該 軸承7插通有軸8,閥體6係被構成為可以軸8為支點自由 旋動。 於闊體6 之閥座抵接面設有凸部9，該凸部9在 閥體6 M431714 位於閥座5之狀態下被從容於間座5之内側。 又，於闕體6之周緣形成有突出為與閥座5之間體6 被設置之面平行之卡止部1〇。於該卡止部1〇卡止有j = 6開放時使開關手段作動之桿"之-端，桿"係卡… 卡止部！〇之間體座面5八對向之面10A。卡止部1〇係形成 於從間體6之中心軸偏心之位置。此係由於_ 2或圖3 中以封閉本體1之開口部1A之蓋1B為正面時，由本體j 被突出之桿U位於側面後方’後述之排水閥^係於同側面 前方設置。 少桿11之另一端12係被突出至少本體丨之外部。桿n 係受設於中間部分之轴11Α軸支，構成為桿11可於卡:部 之，方向即流水檢測裝置之二次側方向自由旋動°。 才干11之另端.12係位於收容設於本體！之外 開檢測器部Α之她；Μ】2 h ° Λ (知子相13内，於該端子箱13内收容有於 閥體6開放時輸屮# _ ' 丁勒〗出仡唬之極限開關14、計時器機構15、 子台16。 之另一端12被設置於端子箱13内之彈簧I?往 流水檢測裝置之_兮 _ _ ^ ' 、-人側1方向彈壓。該弹簧1 7之彈壓力使 本體1内部之桿u端被彈壓往卡止部1()之自iga方向。 但由於彈益 1 n 一、坪β 17之力小於使閥體ό開放之力，故閥體6不合 因持續受彈簧17之彈壓力而開放。 曰 才干Π之另—端12之端部係處於抵接於計時器機構η 之極限開關按壓部1 8之狀態。極限開關按壓部i 8雖被計 寺器機構1 5内之未圖示之彈壓手段往極限開關14側彈 M431714 壓，但桿1 1之另一端12阻止極限開關按壓部丨8之往極限 開關14側之移動。 桿11之另一端12從極限開關按壓部18離開後，極限 開關按壓部18藉由計時器機構15内之彈壓手段往極限開 關1 4側移動，發出使極限開關1 4作動之信號。 於本體1於端子箱13之附近設置有排水閥B ,於本體 1之二次側II形成有與排水閥B連通之未圖示之開口部。 排水閥B係内部之流路為彎曲之角閥構造，排水閥B之排 出口係設置於流水檢測裝置之底面侧。排水閥B與本體i 係以複數之螺栓設置於本體1。 由於排水閥B之手柄2丨係設置於流水檢測裝置之前 方’故排水閥B之開閉操作為容易。 說明已於上述說明之流水檢測裝置之作動。 本創作之流水檢测裝置係設置於已充水之滅火設備管 線上，連接於一次側I之管線係連接於未圖示之水源或加壓 送水裝置等，於二次側Π之管線連接有未圖示之灑水頭。 火火發生後，火災附近之灑水頭作動且灑水頭之喷嘴 開放。由於從灑水頭之噴嘴有管線内之水被放出，故管線 内之水之壓力會減少。 連接有灑水頭之二次側之管線内之壓力減少會使流水 檢測裝置之二次側II之壓力亦減少。因此由二次側Η之水 之壓力按壓閥體6之力量減少，閥體6因—次側^水之壓 力而往開放方向旋動。閥體6之旋動使設置於閥體6之周 緣之卡止部10與該閉閥時與卡止部1〇接觸之桿u分離。 9 M431714 設置於桿u之另-端12之彈f 17之彈壓力使本體夏側之 桿11之端往二次側II之方向旋動。Patent Document 1 is included. The water-measuring device of the patent document 丨I ^ ^ ^ inserts the red arm of the switch operation into the valve box from the outside and the switch 刼 acts on the swing arm. The horizontal rotary axis is set to be freely rotatable by the middle. . The switch operation uses the rotary arm of the valve box ^ 9a side to know that the elastic pressure method is used to abut the valve body, and the rotary zinc is used for the switching operation, and the outside of the end of the #卩°卩 side is set to be illegal. The rotation of the red boom opens the switch means, and the M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M [Patent Document 1] Japanese Patent No. 3865745 [New Content] The above-described water flow detecting device is used in a water supply device for a house. The water flow detecting device installed in a general building or a shopping center is a sprinkler device for a house. The flow detection device used has a large valve diameter, and since the angle at which the valve body is opened when the concentrated water head is actuated is extremely small, it is difficult to measure the opening of the valve body by the switching means. In view of the above problems, in order to provide the flow detection device which is provided by the opening of the valve body and the flow detection device of the output of the LV, in view of the above-mentioned problems, the flow detection device which is provided for the opening of the valve body can be detected. In order to achieve the above object, the creation described in claim i is in the flow detection device provided in the fire extinguishing device pipeline, and the inside is in the form of a swing check valve structure, and the valve body which is pivotally supported and freely rotatable is closed at any time. In the flowing water detecting device for outputting the signal in the opening direction of the body, a rod of the locking portion provided in contact with the peripheral edge of the body is inserted from the outside of the valve box, and the rod is supported by the opening of the valve body In the direction of the secondary side, a switching means is disposed in the vicinity of the end of the rod protruding to the outside of the valve box, and the valve body is opened to rotate the rod in the secondary direction to cause the switching means to actuate the flow detecting device. According to the creation of the request item 2, in the flow detecting device described above, the end of the inner side of the valve box of the crucible is urged by the biasing means to the opening direction of the valve body: 1 The flow detecting device described. Month, 丄/丄4 According to the request item 3 丨 丨 丨 丨 * * ’ 系 系 系 系 系 系 系 系 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求5) According to the creation of claim 4, the valve seat abutment surface of the valve body is formed with a metal device, and the protrusion portion of the metal portion extending from the gas item W side is described in the claim 1 Flow detection device. According to the creation of the claim 5, in the above-described flow detecting device, the locking portion is provided in the center axis of the valve body, and the card flow detecting device is disposed. m set - seeking! According to the creation of the claim 6, in the above-described flowing water detecting device, the surface on which the rod of the engaging portion contacts is set as the running water detecting device facing the reading surface. ^ ί 5 The creation of the item 7 is based on the creation of the flow detection device, which is provided when the valve is opened and the valve is turned back to the valve when the valve is turned on. The raw water detecting device described in claim 1 of the original means. According to the creation of the claim 8, in the flow detection detecting device, when the surface of the lid portion on which the opening portion of the valve box is closed is the front surface, the rod protrudes from the side of the feeding device of the flowing water detecting device. A flow detecting device described in the item 1 of the drain valve is provided on the near side of the rod. According to the creation of the monthly item 9, the surface of the water detecting device is disposed on the side of the running water detecting device in which the surface of the opening portion of the opening portion of the closed box is provided as the front surface and the drain valve system is disposed on the side of the flowing water detecting device. 8 : Flow detection device. ° According to the present creation, the setting-end contact with the rod of the M431714 locking portion protruding from the periphery of the valve body forms a space between the rod and the periphery of the valve body, thereby preventing the rod from being clamped to the valve body during the opening and closing of the valve body Between the valve seat and the seat. And the inner side of the valve box of the rod is biased by the elastic means to the opening direction of the valve body, and the rod can follow the rotation when the valve body is only slightly opened. [Embodiment] In the water detecting device of the creation, an elastic body or an elastic body can be used. Hammer, magnet, etc. are used as the elastic means for pressing the rod end inside the valve box to the valve body opening direction. Further, the position of the biasing means may be provided inside the valve casing, but it is preferably provided on the side of the rod which is protruded to the outside of the valve casing. The flowing water detecting device is configured such that when the sprinkler head provided on the secondary side is actuated, the water discharge causes the secondary side helium pressure to decrease, and when the primary side pressure of the flowing water detecting device and the secondary side pressure generate a differential pressure, the valve body is opened, and the valve body is detected. Open and output signals. The nozzle diameter of the sprinkler head is significantly different from the valve diameter of the flow detecting device, and the amount of swirling of the valve body that is opened from the primary side following the secondary side pressure reduction amount is extremely small. Therefore, it is preferable that the valve seat abutting surface of the valve body is formed to protrude toward the primary side. In addition, the protruding portion also functions as a hammer, and has a function of causing the valve body to be in the closing direction when the valve body is open. In order to make the hammer work, it is preferable to use a metal material for the material of the protrusion, specifically, a copper alloy or iron. The locking portion provided on the periphery of the valve body is provided at a position where the rod is eccentric from the central axis of the body, and is also disposed at a position eccentric from the center axis of the valve body, whereby the configuration of the flowing water detecting device can be simplified. Specifically, a rod is disposed on the back side M431714 of the flow detecting device eccentric from the central axis of the valve body so as to protrude from the side of the flowing water detecting device, and a drain valve is provided at the proximal end of the rod to approach one side of the flowing water detecting device It is possible to configure the switching means and the drain valve set near the rod. Further, when the surface in contact with the rod of the locking portion is provided at a position facing the yoke surface, the rod end inside the box is blocked by the body opening locking portion when the chamber is closed. On the other hand, in the open state, „_, J = the rod end that has been rotated to the secondary side direction is induced to the original position to be restored. # [Examples] Hereinafter, the creation will be described with reference to Figs. Fig. i is a cross-sectional view of the flowing water detecting device of the present invention. 2 is a plan view of the flowing water detecting device of the present invention. Fig. 3 is a cross-sectional view, w 4 is a YY sectional view of Fig. 2, and Fig. 4 is Fig. 4. The flow detection device of the present invention is composed of a main body 丨, a valve opening detecting portion A, and a drain valve B. The main body 1 has a hollow shape with flanges 2 and 2 on the upper and lower sides, and is internally provided. A partition 3 on the primary side of the zone cutter and the secondary side π is formed. A communication port 4 is formed in the partition wall 3, and a cylindrical valve seat 5 is provided on the secondary side of the communication port 4. The valve body 6 is placed thereon, and a bearing 7 formed with a cylinder parallel to the valve body seat surface 5 of the valve seat 5 is disposed at the edge of the valve body 6, and the shaft 7 is inserted into the bearing 7, and the valve body is inserted. The 6-series is configured to be freely rotatable with the shaft 8 as a fulcrum. The valve seat abutting surface of the wide body 6 is provided with a convex portion 9 which is accommodated inside the seat 5 in a state where the valve body 6 M431714 is located at the valve seat 5. Further, a locking portion 1 that protrudes in parallel with the surface on which the body 6 is disposed between the valve seat 5 is formed on the periphery of the body 6. In the locking portion 1〇, when the j=6 is opened, the switch means actuates the lever" the end, the lever" the card... the locking portion! Between the 〇 between the body seat surface 5 eight opposite faces 10A. The locking portion 1 is formed at a position eccentric from the central axis of the intermediate body 6. In this case, when the cover 1B of the opening 1A of the main body 1 is closed on the front side in Fig. 3, the rod U which is protruded from the main body j is located on the side rear side. The drain valve which will be described later is disposed in front of the same side surface. The other end 12 of the lower rod 11 is protruded at least outside the body. The rod n is supported by the shaft 11 of the intermediate portion, and the rod 11 is configured to be freely rotatable in the direction of the second side of the flow detecting device. The other end of the talent 11 . 12 is located in the shelter set on the body! Outside the detector unit; Μ] 2 h ° Λ (in the sub-phase 13, in the terminal box 13 is contained in the terminal body 6 when the opening of the valve body # _ ' Dinger〗 仡唬 limit switch 14. The other end 12 of the timer mechanism 15 and the sub-stage 16. The spring end I provided in the terminal box 13 is biased toward the _兮__^' of the flowing water detecting device and the direction of the human side 1. The spring 17 The elastic pressure causes the rod end u inside the body 1 to be biased to the iga direction of the locking portion 1 (). However, since the force of the elastic 1 n 1 and the flat β 17 is smaller than the force for opening the valve body, the valve body 6 The discomfort is continuously opened by the spring pressure of the spring 17. The other end of the end 12 is in a state of abutting against the limit switch pressing portion 18 of the timer mechanism η. The limit switch pressing portion i 8 is The biasing means (not shown) in the temple mechanism 15 is pressed toward the limit switch 14 side M431714, but the other end 12 of the rod 1 1 prevents the movement of the limit switch pressing portion 8 toward the limit switch 14 side. After the other end 12 is separated from the limit switch pressing portion 18, the limit switch pressing portion 18 is biased toward the limit switch 14 by the biasing means in the timer mechanism 15. The side moves to emit a signal for actuating the limit switch 14. The drain valve B is provided in the vicinity of the terminal box 13 in the main body 1, and an opening portion (not shown) communicating with the drain valve B is formed on the secondary side II of the main body 1. The flow path inside the drain valve B is a curved angle valve structure, and the discharge port of the drain valve B is disposed on the bottom side of the flowing water detecting device. The drain valve B and the body i are provided in the main body 1 by a plurality of bolts. The handle 2 of the valve B is disposed in front of the flowing water detecting device. Therefore, the opening and closing operation of the drain valve B is easy. The operation of the flowing water detecting device described above has been described. The flow detecting device of the present invention is installed in the water filling device. In the fire extinguishing equipment line, the line connected to the primary side I is connected to a water source or a pressurized water supply device (not shown), and a sprinkler head (not shown) is connected to the line on the secondary side. After the fire occurs, the fire occurs. The nearby sprinkler head is actuated and the nozzle of the sprinkler head is open. Since the water in the pipeline is discharged from the nozzle of the sprinkler head, the pressure of the water in the pipeline is reduced. The pressure in the pipeline connecting the secondary side of the sprinkler head is reduced. The pressure on the secondary side II of the flowing water detecting device is also reduced. Therefore, the force of pressing the valve body 6 by the pressure of the water of the secondary side is reduced, and the valve body 6 is rotated in the opening direction due to the pressure of the secondary side water. The rotation of the valve body 6 separates the locking portion 10 provided on the periphery of the valve body 6 from the rod u which is in contact with the locking portion 1〇 when the valve is closed. 9 M431714 The spring disposed at the other end of the rod u The spring pressure of f 17 causes the end of the rod 11 on the summer side of the body to rotate in the direction of the secondary side II.
桿11之旋動使端子箱13側之端12從計時器機構U 之極限開關按壓部1 8離開。阻止往極限開關14之移動之 端12離開使極限開關按壓部18往極限開關14側移動，發 出使極限開關14作動之信號。 X 藉由該信號通知灑水頭已作動，使對已作動之灑水頭 進行給水之泵啟動，或發出告知於建築物内有火災發生之 警報。 以下說明已開放之閥體關閉時之動作。 閥體6以管線内之水之振動等瞬間開放後關閉時，由 於閥體6之卡止部10按壓轉動至二次側„方向之狀態之桿 11之端並位於閥座5後®到關·閉散態’故桿i i亦可回歸原 本之位置。 【圖式簡單說明】 圖1為本創作之流水檢測裝置之剖面圖。 圖2為本創作之流水檢測裝置之平面圖。 圖3為圖1之X-X到面圖。 圖4為圖2之Y-Y剖面圖。 圖5為圖4中之閥體開放之狀態。 【主要元件符號說明】 1 本體 10 M431714 5 閥座 6 閥體 7 軸承 8 轴 10 卡止部 11 桿 1 1 A 桿之軸 13 端子箱 14 極限開關 15 計時器機構 17 彈簧 18 極限開關按壓部 A ) 閥開檢測部 B 排水閥The rotation of the rod 11 causes the end 12 on the terminal box 13 side to exit from the limit switch pressing portion 18 of the timer mechanism U. The end 12 that prevents the movement to the limit switch 14 is moved away from the limit switch pressing portion 18 toward the limit switch 14 side, and a signal for causing the limit switch 14 to act is issued. X signals that the sprinkler has been actuated to activate the pump for the water supply to the activated sprinkler or to alert the building that there is a fire. The following describes the action when the valve body that has been opened is closed. When the valve body 6 is opened and closed by the vibration of the water in the pipeline, the locking portion 10 of the valve body 6 is pressed and rotated to the end of the rod 11 in the state of the secondary side „direction and is located behind the valve seat 5® to the off · Closed state 'The rod ii can also return to the original position. [Simple diagram of the drawing] Figure 1 is a cross-sectional view of the flow detection device of the present invention. Figure 2 is a plan view of the flow detection device of the present invention. Fig. 4 is a cross-sectional view taken along line YY of Fig. 2. Fig. 5 is a state in which the valve body of Fig. 4 is open. [Description of main components] 1 body 10 M431714 5 valve seat 6 valve body 7 bearing 8 shaft 10 Locking part 11 Rod 1 1 A shaft of shaft 13 Terminal box 14 Limit switch 15 Timer mechanism 17 Spring 18 Limit switch pressing part A) Valve opening detection part B Drain valve