一项系(xi)统(tong)工程(cheng)中(zhong)多加(jia)或(huo)优化减(jian)少一个产品，可能(neng)会使任务完成的(de)(de)(de)(de)更容(rong)易(yi)，所(suo)(suo)能(neng)达到(dao)的(de)(de)(de)(de)效果也会更好。在实验(yan)室、厂(chang)房(fang)等(deng)(deng)高(gao)大(da)空(kong)(kong)间场(chang)所(suo)(suo)通(tong)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)排风(feng)(feng)(feng)(feng)(feng)(feng)(feng)中(zhong)，在新(xin)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)系(xi)统(tong)、排风(feng)(feng)(feng)(feng)(feng)(feng)(feng)系(xi)统(tong)、变风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)空(kong)(kong)调系(xi)统(tong)和(he)净(jing)化空(kong)(kong)调系(xi)统(tong)中(zhong)，适当使用定(ding)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)，可起到(dao)优化系(xi)统(tong)设计(ji)，平衡(heng)送(song)、排风(feng)(feng)(feng)(feng)(feng)(feng)(feng)，调试工作量(liang)减(jian)少等(deng)(deng)作用，这样在很大(da)程(cheng)度上保(bao)证(zheng)了系(xi)统(tong)调节精确(que)的(de)(de)(de)(de)加(jia)强(qiang)，令(ling)空(kong)(kong)调和(he)通(tong)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)系(xi)统(tong)效果也更有保(bao)证(zheng)。小编与(yu)大(da)家简(jian)单(dan)聊一下(xia)，定(ding)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)在洁(jie)净(jing)空(kong)(kong)调系(xi)统(tong)中(zhong)的(de)(de)(de)(de)应用。通(tong)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)像手术室及(ji)洁(jie)净(jing)厂(chang)房(fang)等(deng)(deng)，就属于(yu)有洁(jie)净(jing)要求的(de)(de)(de)(de)房(fang)间或(huo)车间，其中(zhong)对于(yu)保(bao)证(zheng)洁(jie)净(jing)度效果影响(xiang)很大(da)的(de)(de)(de)(de)因素，就是场(chang)所(suo)(suo)各区域的(de)(de)(de)(de)压(ya)力分(fen)(fen)布，要想保(bao)证(zheng)合理的(de)(de)(de)(de)压(ya)力分(fen)(fen)布，除要正确(que)计(ji)算空(kong)(kong)气平衡(heng)外，更重要的(de)(de)(de)(de)是送(song)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)、回(hui)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)均应有良好的(de)(de)(de)(de)调节手段。准确(que)地测量(liang)和(he)控制进入排风(feng)(feng)(feng)(feng)(feng)(feng)(feng)柜的(de)(de)(de)(de)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)，依赖(lai)于(yu)所(suo)(suo)用智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)的(de)(de)(de)(de)精度。四川双向智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)市场(chang)价

智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)(fa)(fa)根据不同作用(yong)可(ke)分(fen)为定(ding)(ding)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)与变(bian)(bian)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)、双(shuang)稳(wen)态阀(fa)(fa)(fa)，三(san)者有相同也有不同之处，相同的(de)(de)是同样可(ke)以加速使用(yong)场景(jing)中的(de)(de)送风(feng)(feng)(feng)(feng)(feng)(feng)(feng)速度，与变(bian)(bian)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)(fa)(fa)不同的(de)(de)是，定(ding)(ding)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)(fa)(fa)只(zhi)限(xian)于提供稳(wen)定(ding)(ding)的(de)(de)气(qi)(qi)(qi)(qi)流(liu)量(liang)(liang)，不能(neng)改变(bian)(bian)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)向空气(qi)(qi)(qi)(qi)流(liu)量(liang)(liang)，而双(shuang)稳(wen)态阀(fa)(fa)(fa)则可(ke)提供气(qi)(qi)(qi)(qi)流(liu)量(liang)(liang)的(de)(de)大、小化，现在(zai)智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)(fa)(fa)生产厂家来讲解一下，变(bian)(bian)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)(fa)(fa)可(ke)适用(yong)的(de)(de)场景(jing)有哪些？要(yao)(yao)(yao)知道对于变(bian)(bian)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)(fa)(fa)而言，除(chu)了风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)控制(zhi)(zhi)之外(wai)，还(hai)可(ke)以连接各类(lei)传感(gan)器(qi)或(huo)数字量(liang)(liang)输(shu)入信(xin)号，完成对风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)、风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)差(cha)、压(ya)力、温度等参(can)数的(de)(de)控制(zhi)(zhi)，只(zhi)要(yao)(yao)(yao)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)管的(de)(de)压(ya)力在(zai)变(bian)(bian)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)(fa)(fa)的(de)(de)工作范围(wei)内，智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)(fa)(fa)便会(hui)精(jing)确控制(zhi)(zhi)空气(qi)(qi)(qi)(qi)的(de)(de)流(liu)量(liang)(liang)。作为空调通风(feng)(feng)(feng)(feng)(feng)(feng)(feng)系统未端(duan)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)控制(zhi)(zhi)设备，变(bian)(bian)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)(fa)(fa)适用(yong)于所有对风(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)(liang)需要(yao)(yao)(yao)精(jing)确控制(zhi)(zhi)的(de)(de)场合(he)。北京单向智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)(fa)(fa)报价妙流(liu)智能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)(fa)(fa)只(zhi)需要(yao)(yao)(yao)简单安装后即可(ke)投入使用(yong)。

智能(neng)(neng)(neng)风(feng)阀(fa)的(de)(de)(de)(de)(de)变风(feng)量(liang)系(xi)(xi)统(tong)中重要(yao)(yao)的(de)(de)(de)(de)(de)零部(bu)件是(shi)(shi)(shi)(shi)阀(fa)门，其中又分(fen)为变风(feng)量(liang)蝶(die)阀(fa)和智能(neng)(neng)(neng)风(feng)阀(fa)。不(bu)同实(shi)验(yan)室(shi)有不(bu)同的(de)(de)(de)(de)(de)需求，蝶(die)阀(fa)的(de)(de)(de)(de)(de)控(kong)(kong)制(zhi)(zhi)精度(du)(du)(du)(du)是(shi)(shi)(shi)(shi)比智能(neng)(neng)(neng)风(feng)阀(fa)要(yao)(yao)低的(de)(de)(de)(de)(de)，但如果是(shi)(shi)(shi)(shi)对精度(du)(du)(du)(du)要(yao)(yao)求并不(bu)高(gao)(gao)的(de)(de)(de)(de)(de)实(shi)验(yan)室(shi)，选(xuan)择性(xing)价比更(geng)高(gao)(gao)的(de)(de)(de)(de)(de)蝶(die)阀(fa)也是(shi)(shi)(shi)(shi)可(ke)(ke)(ke)以(yi)的(de)(de)(de)(de)(de)。智能(neng)(neng)(neng)风(feng)阀(fa)的(de)(de)(de)(de)(de)好处就在(zai)于，它在(zai)系(xi)(xi)统(tong)精度(du)(du)(du)(du)和速度(du)(du)(du)(du)响应方(fang)面(mian)可(ke)(ke)(ke)以(yi)堪称快准狠(hen)，是(shi)(shi)(shi)(shi)利用(yong)(yong)了位(wei)移传感(gan)器(qi)将位(wei)移信(xin)号输送(song)给(ji)控(kong)(kong)制(zhi)(zhi)器(qi)，从(cong)而达到(dao)自(zi)(zi)行(xing)调(diao)节(jie)阀(fa)门开度(du)(du)(du)(du)控(kong)(kong)制(zhi)(zhi)风(feng)量(liang)大小的(de)(de)(de)(de)(de)作用(yong)(yong)。智能(neng)(neng)(neng)风(feng)阀(fa)较于蝶(die)阀(fa)，不(bu)但能(neng)(neng)(neng)实(shi)现高(gao)(gao)调(diao)节(jie)比例，而且(qie)(qie)系(xi)(xi)统(tong)的(de)(de)(de)(de)(de)抗干(gan)扰性(xing)很(hen)好，不(bu)会受到(dao)其它外来压力的(de)(de)(de)(de)(de)影响。制(zhi)(zhi)造智能(neng)(neng)(neng)风(feng)阀(fa)的(de)(de)(de)(de)(de)生(sheng)产厂(chang)家，行(xing)业内(nei)排得上号的(de)(de)(de)(de)(de)就那么(me)几家，毕(bi)竟(jing)不(bu)是(shi)(shi)(shi)(shi)谁都(dou)能(neng)(neng)(neng)做到(dao)在(zai)满足国家标准和合格质(zhi)检(jian)的(de)(de)(de)(de)(de)要(yao)(yao)求上，还(hai)能(neng)(neng)(neng)开拓创新的(de)(de)(de)(de)(de)。仔细观察它的(de)(de)(de)(de)(de)基本参数，就会发现其系(xi)(xi)统(tong)是(shi)(shi)(shi)(shi)自(zi)(zi)调(diao)式机械(xie)组件，智能(neng)(neng)(neng)到(dao)什么(me)程(cheng)度(du)(du)(du)(du)呢(ni)？可(ke)(ke)(ke)以(yi)说，控(kong)(kong)制(zhi)(zhi)信(xin)号的(de)(de)(de)(de)(de)响应速度(du)(du)(du)(du)只有一(yi)秒(miao)钟不(bu)到(dao)，眨(zha)个眼睛的(de)(de)(de)(de)(de)功夫，且(qie)(qie)其压力无关的(de)(de)(de)(de)(de)响应时间也小于一(yi)秒(miao)钟，还(hai)能(neng)(neng)(neng)将震(zhen)荡幅度(du)(du)(du)(du)稳(wen)定控(kong)(kong)制(zhi)(zhi)在(zai)5%以(yi)内(nei)，适用(yong)(yong)性(xing)非常强。

智(zhi)(zhi)(zhi)(zhi)能(neng)风(feng)(feng)(feng)(feng)(feng)阀改变(bian)(bian)(bian)了风(feng)(feng)(feng)(feng)(feng)量(liang)(liang)(liang)(liang)(liang)控制(zhi)(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)模式(shi)，使得风(feng)(feng)(feng)(feng)(feng)量(liang)(liang)(liang)(liang)(liang)控制(zhi)(zhi)(zhi)(zhi)(zhi)更加(jia)的(de)(de)(de)(de)(de)稳(wen)定和精(jing)确，阀门的(de)(de)(de)(de)(de)压(ya)力无关性，对于(yu)风(feng)(feng)(feng)(feng)(feng)管(guan)(guan)中(zhong)(zhong)压(ya)力波动能(neng)作(zuo)出极(ji)快的(de)(de)(de)(de)(de)响应(ying)，保(bao)证风(feng)(feng)(feng)(feng)(feng)量(liang)(liang)(liang)(liang)(liang)控制(zhi)(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)稳(wen)定性，应(ying)用(yong)在对风(feng)(feng)(feng)(feng)(feng)量(liang)(liang)(liang)(liang)(liang)需要精(jing)确控制(zhi)(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)场所，智(zhi)(zhi)(zhi)(zhi)能(neng)风(feng)(feng)(feng)(feng)(feng)阀是高精(jing)度(du)、快速反应(ying)，与(yu)压(ya)力变(bian)(bian)(bian)化(hua)(hua)无关，采(cai)用(yong)快速直线行程(cheng)电动执行器驱(qu)动的(de)(de)(de)(de)(de)风(feng)(feng)(feng)(feng)(feng)量(liang)(liang)(liang)(liang)(liang)控制(zhi)(zhi)(zhi)(zhi)(zhi)设(she)备；具有(you)(you)不(bu)受(shou)风(feng)(feng)(feng)(feng)(feng)管(guan)(guan)内(nei)(nei)静压(ya)变(bian)(bian)(bian)化(hua)(hua)影响，特有(you)(you)的(de)(de)(de)(de)(de)阀芯(xin)组件(jian)，内(nei)(nei)置精(jing)密的(de)(de)(de)(de)(de)不(bu)锈钢弹簧，当风(feng)(feng)(feng)(feng)(feng)管(guan)(guan)内(nei)(nei)压(ya)力变(bian)(bian)(bian)化(hua)(hua)时(shi)，通过(guo)阀芯(xin)位置的(de)(de)(de)(de)(de)改变(bian)(bian)(bian)来保(bao)持一个恒定的(de)(de)(de)(de)(de)风(feng)(feng)(feng)(feng)(feng)量(liang)(liang)(liang)(liang)(liang)。它的(de)(de)(de)(de)(de)众(zhong)多特性赋予了实(shi)验室(shi)(shi)控制(zhi)(zhi)(zhi)(zhi)(zhi)系(xi)统在排风(feng)(feng)(feng)(feng)(feng)柜和实(shi)验室(shi)(shi)控制(zhi)(zhi)(zhi)(zhi)(zhi)方面良好的(de)(de)(de)(de)(de)性能(neng)，变(bian)(bian)(bian)风(feng)(feng)(feng)(feng)(feng)量(liang)(liang)(liang)(liang)(liang)系(xi)统中(zhong)(zhong)，智(zhi)(zhi)(zhi)(zhi)能(neng)风(feng)(feng)(feng)(feng)(feng)阀具有(you)(you)不(bu)受(shou)风(feng)(feng)(feng)(feng)(feng)管(guan)(guan)内(nei)(nei)静压(ya)变(bian)(bian)(bian)化(hua)(hua)影响，当风(feng)(feng)(feng)(feng)(feng)管(guan)(guan)内(nei)(nei)压(ya)力变(bian)(bian)(bian)化(hua)(hua)时(shi)，通过(guo)阀芯(xin)位置的(de)(de)(de)(de)(de)改变(bian)(bian)(bian)来保(bao)持一个恒定的(de)(de)(de)(de)(de)风(feng)(feng)(feng)(feng)(feng)量(liang)(liang)(liang)(liang)(liang)。收到控制(zhi)(zhi)(zhi)(zhi)(zhi)器提(ti)供(gong)一个控制(zhi)(zhi)(zhi)(zhi)(zhi)命(ming)令信号之后，便被迅速调(diao)节到相应(ying)的(de)(de)(de)(de)(de)风(feng)(feng)(feng)(feng)(feng)量(liang)(liang)(liang)(liang)(liang)。只(zhi)要风(feng)(feng)(feng)(feng)(feng)管(guan)(guan)的(de)(de)(de)(de)(de)压(ya)力在变(bian)(bian)(bian)风(feng)(feng)(feng)(feng)(feng)量(liang)(liang)(liang)(liang)(liang)智(zhi)(zhi)(zhi)(zhi)能(neng)风(feng)(feng)(feng)(feng)(feng)阀的(de)(de)(de)(de)(de)工作(zuo)范围内(nei)(nei)，智(zhi)(zhi)(zhi)(zhi)能(neng)风(feng)(feng)(feng)(feng)(feng)阀便会精(jing)确的(de)(de)(de)(de)(de)控制(zhi)(zhi)(zhi)(zhi)(zhi)风(feng)(feng)(feng)(feng)(feng)量(liang)(liang)(liang)(liang)(liang)。智(zhi)(zhi)(zhi)(zhi)能(neng)风(feng)(feng)(feng)(feng)(feng)阀的(de)(de)(de)(de)(de)单(dan)个圆形风(feng)(feng)(feng)(feng)(feng)阀采(cai)用(yong)插接连接。

智能(neng)风(feng)阀气(qi)流(liu)控(kong)(kong)制(zhi)(zhi)(zhi)的(de)(de)主要目标是：(1)保(bao)(bao)障操作(zuo)(zuo)(zuo)人员的(de)(de)安(an)全，通(tong)过控(kong)(kong)制(zhi)(zhi)(zhi)实验过程中(zhong)产生的(de)(de)有毒颗粒或气(qi)溶胶来实现(xian)；根据各(ge)个房(fang)间(jian)的(de)(de)排风(feng)量及(ji)其(qi)变化情况，通(tong)过控(kong)(kong)制(zhi)(zhi)(zhi)系统来操作(zuo)(zuo)(zuo)智能(neng)风(feng)阀来实现(xian)对送(song)往每(mei)个房(fang)间(jian)的(de)(de)新(xin)风(feng)量和补风(feng)量的(de)(de)控(kong)(kong)制(zhi)(zhi)(zhi)，从而达(da)到对送(song)风(feng)系统的(de)(de)控(kong)(kong)制(zhi)(zhi)(zhi)，智能(neng)风(feng)阀在理(li)化实验室适应(ying)(ying)性(xing)气(qi)流(liu)控(kong)(kong)制(zhi)(zhi)(zhi)系统中(zhong)作(zuo)(zuo)(zuo)为适应(ying)(ying)性(xing)控(kong)(kong)制(zhi)(zhi)(zhi)机构(gou)。(2)确保(bao)(bao)房(fang)间(jian)的(de)(de)压(ya)力(li)，通(tong)过控(kong)(kong)制(zhi)(zhi)(zhi)房(fang)间(jian)的(de)(de)压(ya)力(li)来实现(xian)房(fang)间(jian)的(de)(de)正(zheng)压(ya)或负压(ya)以(yi)及(ji)不同空间(jian)的(de)(de)压(ya)力(li)梯度，实现(xian)对操作(zuo)(zuo)(zuo)人员的(de)(de)保(bao)(bao)护和实验环境的(de)(de)保(bao)(bao)证(zheng)。智能(neng)风(feng)阀的(de)(de)工作(zuo)(zuo)(zuo)原(yuan)理(li)并不复杂，同样是借助传感器(qi)来进行(xing)风(feng)量的(de)(de)控(kong)(kong)制(zhi)(zhi)(zhi)。山东电(dian)动(dong)智能(neng)风(feng)阀生产

智(zhi)(zhi)能风阀也同样(yang)是因为便于安装。四(si)川(chuan)双向智(zhi)(zhi)能风阀市(shi)场价(jia)

“系统(tong)(tong)”一(yi)般(ban)是指由(you)多个或无(wu)(wu)数(shu)个软硬件组成(cheng)，共同营造某种(zhong)特定(ding)(ding)(ding)环境，或达到(dao)某种(zhong)功(gong)能(neng)，一(yi)个产品(pin)(pin)无(wu)(wu)法单独运作就完成(cheng)一(yi)个系统(tong)(tong)的(de)功(gong)能(neng)，系统(tong)(tong)中的(de)每个产品(pin)(pin)各司其(qi)职，各自具(ju)有其(qi)无(wu)(wu)可(ke)替(ti)代的(de)功(gong)能(neng)，就像一(yi)套完整的(de)实验(yan)室通(tong)(tong)(tong)风(feng)(feng)(feng)(feng)(feng)(feng)系统(tong)(tong)中，需要以下这(zhei)些搭档变风(feng)(feng)(feng)(feng)(feng)(feng)量智(zhi)(zhi)能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)才能(neng)高效控风(feng)(feng)(feng)(feng)(feng)(feng)。虽(sui)然不同实验(yan)室用途不同，但通(tong)(tong)(tong)风(feng)(feng)(feng)(feng)(feng)(feng)系统(tong)(tong)基本会包括变风(feng)(feng)(feng)(feng)(feng)(feng)量智(zhi)(zhi)能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)、定(ding)(ding)(ding)风(feng)(feng)(feng)(feng)(feng)(feng)量智(zhi)(zhi)能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)、温(wen)湿(shi)度传(chuan)感(gan)(gan)器(qi)、差(cha)压(ya)传(chuan)感(gan)(gan)器(qi)和(he)房(fang)间控制(zhi)触摸屏、通(tong)(tong)(tong)风(feng)(feng)(feng)(feng)(feng)(feng)管道等，将(jiang)这(zhei)些产品(pin)(pin)联(lian)系起(qi)来，通(tong)(tong)(tong)过程(cheng)序的(de)设定(ding)(ding)(ding)，当(dang)温(wen)湿(shi)度传(chuan)感(gan)(gan)器(qi)与差(cha)压(ya)传(chuan)感(gan)(gan)器(qi)检测并形成(cheng)室内(nei)(nei)温(wen)湿(shi)度参数(shu)后，达到(dao)传(chuan)感(gan)(gan)器(qi)响(xiang)应程(cheng)序的(de)预设值，便会发出(chu)信号给(ji)到(dao)控制(zhi)面板，工作人员便可(ke)以通(tong)(tong)(tong)过控制(zhi)面板的(de)操(cao)(cao)作，发出(chu)指令给(ji)到(dao)变风(feng)(feng)(feng)(feng)(feng)(feng)量与定(ding)(ding)(ding)风(feng)(feng)(feng)(feng)(feng)(feng)量智(zhi)(zhi)能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)，后者与通(tong)(tong)(tong)风(feng)(feng)(feng)(feng)(feng)(feng)管道配合对(dui)室内(nei)(nei)进行通(tong)(tong)(tong)风(feng)(feng)(feng)(feng)(feng)(feng)排风(feng)(feng)(feng)(feng)(feng)(feng)操(cao)(cao)作。四川双向智(zhi)(zhi)能(neng)风(feng)(feng)(feng)(feng)(feng)(feng)阀(fa)市场价

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