阀(fa)(fa)(fa)门的(de)(de)(de)(de)控(kong)制(zhi)可(ke)采用(yong)(yong)多种(zhong)传(chuan)动(dong)(dong)(dong)(dong)方式，如(ru)手动(dong)(dong)(dong)(dong)、电(dian)(dian)动(dong)(dong)(dong)(dong)、液动(dong)(dong)(dong)(dong)、气(qi)动(dong)(dong)(dong)(dong)、涡轮、电(dian)(dian)磁动(dong)(dong)(dong)(dong)、电(dian)(dian)磁液动(dong)(dong)(dong)(dong)、电(dian)(dian)液动(dong)(dong)(dong)(dong)、气(qi)液动(dong)(dong)(dong)(dong)、正齿(chi)轮、伞齿(chi)轮驱动(dong)(dong)(dong)(dong)等；可(ke)以(yi)在压力、温度或(huo)其它形式传(chuan)感信(xin)号的(de)(de)(de)(de)作(zuo)用(yong)(yong)下，按(an)预定的(de)(de)(de)(de)要求动(dong)(dong)(dong)(dong)作(zuo)，或(huo)者不依(yi)赖(lai)传(chuan)感信(xin)号而(er)进行简单的(de)(de)(de)(de)开启或(huo)关闭，阀(fa)(fa)(fa)门依(yi)靠驱动(dong)(dong)(dong)(dong)或(huo)自动(dong)(dong)(dong)(dong)机构使(shi)启闭件作(zuo)升降、滑移(yi)、旋摆(bai)或(huo)回(hui)(hui)(hui)转运(yun)动(dong)(dong)(dong)(dong)，从而(er)改变其流(liu)道(dao)面积的(de)(de)(de)(de)大小(xiao)以(yi)实现(xian)其控(kong)制(zhi)功能。按(an)作(zuo)用(yong)(yong)和用(yong)(yong)途（1）截(jie)断(duan)类(lei)：如(ru)闸阀(fa)(fa)(fa)、截(jie)止(zhi)(zhi)阀(fa)(fa)(fa)、旋塞阀(fa)(fa)(fa)、球阀(fa)(fa)(fa)、蝶阀(fa)(fa)(fa)、针型阀(fa)(fa)(fa)、隔膜阀(fa)(fa)(fa)等。截(jie)断(duan)类(lei)阀(fa)(fa)(fa)门又称闭路阀(fa)(fa)(fa)，截(jie)止(zhi)(zhi)阀(fa)(fa)(fa)，其作(zuo)用(yong)(yong)是(shi)(shi)接通或(huo)截(jie)断(duan)管(guan)路中(zhong)的(de)(de)(de)(de)介(jie)(jie)质。止(zhi)(zhi)回(hui)(hui)(hui)阀(fa)(fa)(fa)，鹤壁电(dian)(dian)动(dong)(dong)(dong)(dong)阀(fa)(fa)(fa)，又称单向阀(fa)(fa)(fa)或(huo)逆止(zhi)(zhi)阀(fa)(fa)(fa)，电(dian)(dian)动(dong)(dong)(dong)(dong)阀(fa)(fa)(fa)规格(ge)，止(zhi)(zhi)回(hui)(hui)(hui)阀(fa)(fa)(fa)属(shu)于一种(zhong)自动(dong)(dong)(dong)(dong)阀(fa)(fa)(fa)门，其作(zuo)用(yong)(yong)是(shi)(shi)防止(zhi)(zhi)管(guan)路中(zhong)的(de)(de)(de)(de)介(jie)(jie)质倒(dao)流(liu)、防止(zhi)(zhi)泵及(ji)驱动(dong)(dong)(dong)(dong)电(dian)(dian)机反转，以(yi)及(ji)容(rong)器(qi)介(jie)(jie)质的(de)(de)(de)(de)泄漏。水泵吸(xi)水关的(de)(de)(de)(de)底(di)阀(fa)(fa)(fa)也属(shu)于止(zhi)(zhi)回(hui)(hui)(hui)阀(fa)(fa)(fa)类(lei)。防爆(bao)阀(fa)(fa)(fa)、危险事件阀(fa)(fa)(fa)等，电(dian)(dian)动(dong)(dong)(dong)(dong)阀(fa)(fa)(fa)厂家，安全(quan)阀(fa)(fa)(fa)的(de)(de)(de)(de)作(zuo)用(yong)(yong)是(shi)(shi)防止(zhi)(zhi)管(guan)路或(huo)装置中(zhong)的(de)(de)(de)(de)介(jie)(jie)质压力超(chao)过规定数值(zhi)，从而(er)达(da)到安全(quan)保护的(de)(de)(de)(de)目的(de)(de)(de)(de)。调节阀(fa)(fa)(fa)、节流(liu)阀(fa)(fa)(fa)和减压阀(fa)(fa)(fa)，其作(zuo)用(yong)(yong)是(shi)(shi)调节介(jie)(jie)质的(de)(de)(de)(de)压力、流(liu)量等参数。浙江国星阀(fa)(fa)(fa)门制(zhi)造有限公(gong)司为(wei)您提供(gong)止(zhi)(zhi)回(hui)(hui)(hui)阀(fa)(fa)(fa)设备(bei)，有想法(fa)的(de)(de)(de)(de)不要错过哦！北京(jing)旋启式止(zhi)(zhi)回(hui)(hui)(hui)阀(fa)(fa)(fa)厂价

旋(xuan)启式(shi)止回(hui)阀原理是利用管(guan)道系(xi)(xi)统中(zhong)介质本(ben)身(shen)的(de)流(liu)动(dong)产生(sheng)的(de)压力(li)作(zuo)用而自(zi)动(dong)打开和关(guan)闭(bi)阀板的(de)；用于管(guan)路系(xi)(xi)统，它的(de)主要作(zuo)用是快速关(guan)闭(bi)，及(ji)时遏止管(guan)道内流(liu)体介质回(hui)流(liu)，有(you)(you)效解(jie)决(jue)泵及(ji)其驱动(dong)电(dian)机机因反转造成的(de)故障；我(wo)厂生(sheng)产的(de)旋(xuan)启式(shi)止回(hui)阀另外还可用于补(bu)给压力(li)；如：给环(huan)保、化工等主系(xi)(xi)统压力(li)的(de)辅助系(xi)(xi)统提供压力(li)补(bu)给；旋(xuan)启式(shi)止回(hui)阀规(gui)格参数(shu)：型(xing)号H44H-16C~250H44W-16P~250工作(zuo)压力(li)（MPa）1.6~25适(shi)用温(wen)度（℃）≤425≤550适(shi)用介质水、蒸(zheng)汽、油品弱腐蚀性(xing)介质材料阀体、阀盖、阀瓣(ban)碳素钢(gang)(gang)铬镍钛不(bu)锈钢(gang)(gang)密封面碳钢(gang)(gang)堆焊铁基合金本(ben)体密封湖南管(guan)道式(shi)止回(hui)阀生(sheng)产厂家(jia)止回(hui)阀设备，就选浙江国(guo)星阀门制造有(you)(you)限(xian)公司，让(rang)您满意，欢迎新(xin)老客户来电(dian)！

止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)阀(fa)(fa)(fa)是(shi)指依靠介(jie)(jie)质(zhi)本身(shen)流(liu)(liu)动(dong)而自动(dong)开(kai)、闭(bi)阀(fa)(fa)(fa)瓣，用(yong)(yong)来防(fang)止(zhi)(zhi)(zhi)(zhi)(zhi)介(jie)(jie)质(zhi)倒流(liu)(liu)的(de)阀(fa)(fa)(fa)门，又称逆止(zhi)(zhi)(zhi)(zhi)(zhi)阀(fa)(fa)(fa)、单向(xiang)阀(fa)(fa)(fa)、逆流(liu)(liu)阀(fa)(fa)(fa)、和背压(ya)(ya)阀(fa)(fa)(fa)。止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)阀(fa)(fa)(fa)属(shu)于一(yi)种(zhong)自动(dong)阀(fa)(fa)(fa)门，其主(zhu)要作用(yong)(yong)是(shi)防(fang)止(zhi)(zhi)(zhi)(zhi)(zhi)介(jie)(jie)质(zhi)倒流(liu)(liu)、防(fang)止(zhi)(zhi)(zhi)(zhi)(zhi)泵(beng)及(ji)驱动(dong)电(dian)动(dong)机(ji)反转，以及(ji)容器介(jie)(jie)质(zhi)的(de)泄放。主(zhu)要作用(yong)(yong)止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)阀(fa)(fa)(fa)在(zai)(zai)水(shui)(shui)(shui)(shui)(shui)泵(beng)供水(shui)(shui)(shui)(shui)(shui)系(xi)统中(zhong)的(de)作用(yong)(yong)是(shi)防(fang)止(zhi)(zhi)(zhi)(zhi)(zhi)高压(ya)(ya)水(shui)(shui)(shui)(shui)(shui)回(hui)流(liu)(liu)对水(shui)(shui)(shui)(shui)(shui)泵(beng)叶轮的(de)冲击。系(xi)统在(zai)(zai)运(yun)(yun)行(xing)中(zhong)由于某种(zhong)原因，水(shui)(shui)(shui)(shui)(shui)泵(beng)突然停(ting)止(zhi)(zhi)(zhi)(zhi)(zhi)运(yun)(yun)转时，泵(beng)内压(ya)(ya)力消失，与水(shui)(shui)(shui)(shui)(shui)泵(beng)出(chu)口相连的(de)高压(ya)(ya)水(shui)(shui)(shui)(shui)(shui)就(jiu)会(hui)反向(xiang)流(liu)(liu)回(hui)水(shui)(shui)(shui)(shui)(shui)泵(beng)。水(shui)(shui)(shui)(shui)(shui)泵(beng)出(chu)口装有(you)止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)阀(fa)(fa)(fa)时它会(hui)立即关闭(bi)，防(fang)止(zhi)(zhi)(zhi)(zhi)(zhi)高压(ya)(ya)水(shui)(shui)(shui)(shui)(shui)反向(xiang)流(liu)(liu)回(hui)水(shui)(shui)(shui)(shui)(shui)泵(beng)。止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)阀(fa)(fa)(fa)在(zai)(zai)热(re)水(shui)(shui)(shui)(shui)(shui)系(xi)统的(de)作用(yong)(yong)是(shi)防(fang)止(zhi)(zhi)(zhi)(zhi)(zhi)热(re)水(shui)(shui)(shui)(shui)(shui)回(hui)流(liu)(liu)到管道(dao)中(zhong)。如(ru)果是(shi)PVC管很可能烫(tang)坏管道(dao)，甚至可能伤(shang)人，特别(bie)是(shi)在(zai)(zai)太阳能热(re)水(shui)(shui)(shui)(shui)(shui)器系(xi)统中(zhong)。

升降式(shi)止(zhi)(zhi)回(hui)(hui)阀(fa)(fa)(fa)其(qi)结(jie)构与截止(zhi)(zhi)阀(fa)(fa)(fa)相(xiang)(xiang)似，阀(fa)(fa)(fa)体和(he)阀(fa)(fa)(fa)瓣(ban)(ban)与截止(zhi)(zhi)阀(fa)(fa)(fa)相(xiang)(xiang)同。阀(fa)(fa)(fa)瓣(ban)(ban)上部和(he)阀(fa)(fa)(fa)盖下部加(jia)工有(you)导向(xiang)套(tao)简(jian)(jian)，阀(fa)(fa)(fa)瓣(ban)(ban)导向(xiang)简(jian)(jian)可在(zai)阀(fa)(fa)(fa)盏导向(xiang)简(jian)(jian)内自(zi)由升降，当介质(zhi)(zhi)顺流(liu)(liu)时(shi)(shi)，阀(fa)(fa)(fa)瓣(ban)(ban)靠介质(zhi)(zhi)推力(li)开启(qi)，当介质(zhi)(zhi)停流(liu)(liu)时(shi)(shi)，阀(fa)(fa)(fa)瓣(ban)(ban)靠自(zi)垂降落(luo)在(zai)阀(fa)(fa)(fa)座(zuo)上，起阻(zu)止(zhi)(zhi)介质(zhi)(zhi)逆流(liu)(liu)作用(yong)。直通(tong)(tong)(tong)式(shi)升降止(zhi)(zhi)回(hui)(hui)阀(fa)(fa)(fa)介质(zhi)(zhi)进出(chu)口通(tong)(tong)(tong)道(dao)(dao)(dao)方(fang)向(xiang)与阀(fa)(fa)(fa)座(zuo)通(tong)(tong)(tong)道(dao)(dao)(dao)方(fang)向(xiang)垂直；立式(shi)升降式(shi)止(zhi)(zhi)回(hui)(hui)阀(fa)(fa)(fa)，其(qi)介质(zhi)(zhi)进出(chu)口通(tong)(tong)(tong)道(dao)(dao)(dao)方(fang)向(xiang)与阀(fa)(fa)(fa)座(zuo)通(tong)(tong)(tong)道(dao)(dao)(dao)方(fang)向(xiang)相(xiang)(xiang)同，其(qi)流(liu)(liu)动阻(zu)力(li)较直通(tong)(tong)(tong)式(shi)小。碟式(shi)止(zhi)(zhi)回(hui)(hui)阀(fa)(fa)(fa)：阀(fa)(fa)(fa)瓣(ban)(ban)围绕(rao)阀(fa)(fa)(fa)座(zuo)内的(de)(de)销(xiao)轴旋转的(de)(de)止(zhi)(zhi)回(hui)(hui)阀(fa)(fa)(fa)。碟式(shi)止(zhi)(zhi)回(hui)(hui)阀(fa)(fa)(fa)结(jie)构简(jian)(jian)单，只(zhi)能安装(zhuang)在(zai)水平管道(dao)(dao)(dao)上。管道(dao)(dao)(dao)式(shi)止(zhi)(zhi)回(hui)(hui)阀(fa)(fa)(fa)：阀(fa)(fa)(fa)瓣(ban)(ban)沿着阀(fa)(fa)(fa)体中(zhong)心(xin)线滑动的(de)(de)阀(fa)(fa)(fa)门(men)(men)。管道(dao)(dao)(dao)式(shi)止(zhi)(zhi)回(hui)(hui)阀(fa)(fa)(fa)是(shi)新出(chu)现的(de)(de)一(yi)种阀(fa)(fa)(fa)门(men)(men)，它的(de)(de)体积(ji)小，重量较轻，加(jia)工工艺性好，是(shi)止(zhi)(zhi)回(hui)(hui)阀(fa)(fa)(fa)发展方(fang)向(xiang)之一(yi)。浙江国星阀(fa)(fa)(fa)门(men)(men)制造有(you)限公司(si)(si)是(shi)一(yi)家专业提(ti)供止(zhi)(zhi)回(hui)(hui)阀(fa)(fa)(fa)设备(bei)的(de)(de)公司(si)(si)，有(you)想法可以来我司(si)(si)咨询！

高(gao)(gao)温(wen)高(gao)(gao)压(ya)焊(han)(han)接止(zhi)回阀(fa)(fa)：支(zhi)管两(liang)端(duan)为焊(han)(han)结结构，焊(han)(han)结坡(po)口可按(an)标准或(huo)用(yong)(yong)户要求制作(zuo)，适用(yong)(yong)于火电厂(chang)、石(shi)油(you)化(hua)工(gong)、冶金等(deng)高(gao)(gao)温(wen)高(gao)(gao)压(ya)的(de)(de)(de)(de)水、蒸(zheng)气、油(you)品、过热蒸(zheng)汽(qi)的(de)(de)(de)(de)管道(dao)上作(zuo)防止(zhi)介(jie)质(zhi)回流的(de)(de)(de)(de)装置(zhi)。一(yi)种(zhong)是(shi)(shi)遵循ANSIB16.34和JISE101标准的(de)(de)(de)(de)引进型；另一(yi)种(zhong)是(shi)(shi)Jb3595标准的(de)(de)(de)(de)国标型。其遵循的(de)(de)(de)(de)温(wen)度、压(ya)力等(deng)级是(shi)(shi)一(yi)致的(de)(de)(de)(de)，在一(yi)些管道(dao)中存在着某种(zhong)互换关系。中部采(cai)用(yong)(yong)无阀(fa)(fa)盖压(ya)力自紧式(shi)(shi)，在高(gao)(gao)温(wen)高(gao)(gao)压(ya)工(gong)况下具(ju)有良好(hao)的(de)(de)(de)(de)密(mi)封性能(neng)。自密(mi)封圈有两(liang)种(zhong)材(cai)料：一(yi)种(zhong)是(shi)(shi)低碳(tan)钢，另一(yi)种(zhong)是(shi)(shi)柔性石(shi)墨夹(jia)316丝(网)。密(mi)封面堆焊(han)(han)钻(zuan)基硬质(zhi)合金。其加工(gong)后的(de)(de)(de)(de)纯金属层≥3mm，具(ju)有耐(nai)磨、耐(nai)高(gao)(gao)温(wen)、抗(kang)腐蚀、抗(kang)擦(ca)伤、使用(yong)(yong)寿命长。止(zhi)回阀(fa)(fa)，就选浙江国星阀(fa)(fa)门制造(zao)有限公司(si)，让您满意(yi)，期待您的(de)(de)(de)(de)光(guang)临！天(tian)津(jin)旋启式(shi)(shi)止(zhi)回阀(fa)(fa)价(jia)格

止回(hui)阀设备，就选(xuan)浙江国星阀门制造有限公司，用户的(de)信赖之选(xuan)，欢迎您的(de)来电哦！北(bei)京旋启式止回(hui)阀厂价

对(dui)(dui)(dui)于(yu)可压(ya)(ya)(ya)(ya)缩(suo)性(xing)流(liu)体(ti)用(yong)(yong)(yong)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)选择(ze)时可以(yi)根据(ju)(ju)不可压(ya)(ya)(ya)(ya)缩(suo)性(xing)流(liu)体(ti)用(yong)(yong)(yong)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)的(de)(de)(de)类似方法来进行选择(ze)，如果介(jie)质(zhi)流(liu)动(dong)(dong)范畴很(hen)大(da)，则(ze)用(yong)(yong)(yong)于(yu)可压(ya)(ya)(ya)(ya)缩(suo)性(xing)流(liu)体(ti)的(de)(de)(de)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)可使用(yong)(yong)(yong)一(yi)减速(su)(su)装置，如果介(jie)质(zhi)流(liu)连续不段地(di)快(kuai)速(su)(su)停止(zhi)(zhi)(zhi)(zhi)和启(qi)(qi)动(dong)(dong)，如压(ya)(ya)(ya)(ya)缩(suo)机的(de)(de)(de)出口那(nei)样，则(ze)使用(yong)(yong)(yong)升(sheng)降(jiang)式(shi)(shi)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)；止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)应(ying)确定(ding)相应(ying)的(de)(de)(de)尺寸，阀(fa)(fa)(fa)(fa)(fa)门(men)供(gong)应(ying)商必须提供(gong)选定(ding)尺寸的(de)(de)(de)资料数据(ju)(ju)，这样就能找到给定(ding)流(liu)速(su)(su)下阀(fa)(fa)(fa)(fa)(fa)门(men)全开时的(de)(de)(de)阀(fa)(fa)(fa)(fa)(fa)门(men)尺寸大(da)小(xiao)；对(dui)(dui)(dui)于(yu)DN50mm以(yi)下的(de)(de)(de)高中(zhong)压(ya)(ya)(ya)(ya)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)，宜(yi)选用(yong)(yong)(yong)立(li)式(shi)(shi)升(sheng)降(jiang)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)和直通式(shi)(shi)升(sheng)降(jiang)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)；对(dui)(dui)(dui)于(yu)DN50mm以(yi)下的(de)(de)(de)低(di)压(ya)(ya)(ya)(ya)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)，宜(yi)选用(yong)(yong)(yong)蝶式(shi)(shi)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)、立(li)式(shi)(shi)升(sheng)降(jiang)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)和隔膜式(shi)(shi)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)；对(dui)(dui)(dui)于(yu)DN大(da)于(yu)50mm、小(xiao)于(yu)600mm的(de)(de)(de)高中(zhong)压(ya)(ya)(ya)(ya)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)，宜(yi)选用(yong)(yong)(yong)旋启(qi)(qi)式(shi)(shi)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)；对(dui)(dui)(dui)于(yu)DN大(da)于(yu)200mm、小(xiao)于(yu)1200mm的(de)(de)(de)中(zhong)低(di)压(ya)(ya)(ya)(ya)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)，宜(yi)选用(yong)(yong)(yong)无磨(mo)损(sun)球形止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)；对(dui)(dui)(dui)于(yu)DN大(da)于(yu)50mm、小(xiao)于(yu)2000mm的(de)(de)(de)低(di)压(ya)(ya)(ya)(ya)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)，宜(yi)选用(yong)(yong)(yong)蝶式(shi)(shi)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)和隔膜式(shi)(shi)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)；对(dui)(dui)(dui)于(yu)要求关闭(bi)时水击(ji)(ji)冲击(ji)(ji)比(bi)较小(xiao)或无水击(ji)(ji)的(de)(de)(de)管路，宜(yi)选用(yong)(yong)(yong)缓闭(bi)式(shi)(shi)旋启(qi)(qi)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)和缓闭(bi)式(shi)(shi)蝶形止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)。北(bei)京旋启(qi)(qi)式(shi)(shi)止(zhi)(zhi)(zhi)(zhi)回(hui)(hui)(hui)(hui)(hui)(hui)阀(fa)(fa)(fa)(fa)(fa)厂价

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