止回阀：这种阀门是做为锅炉给水和蒸汽切断用阀，它具有升降式止回阀和截止阀或角阀的综合机能。此外，还有
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的体积小，重量较轻，加工工艺性好，是止回阀发展方向之一。但流体阻力系数比旋启式止回阀略大。五、压紧式
de ti ji xiao zhong liang jiao qing jia gong gong yi xing hao shi zhi hui fa fa zhan fang xiang zhi yi dan liu ti zu li xi shu bi xuan qi shi zhi hui fa lue da wu ya jin shi
道上，密封性较差。四、管道式止回阀：阀瓣沿着阀体中心线滑动的阀门。管道式止回阀是新出现的一种阀门，它
dao shang mi feng xing jiao cha si guan dao shi zhi hui fa fa ban yan zhe fa ti zhong xin xian hua dong de fa men guan dao shi zhi hui fa shi xin chu xian de yi zhong fa men ta
力较直通式小。三、碟式止回阀：阀瓣围绕阀座内的销轴旋转的止回阀。碟式止回阀结构简单，只能安装在水平管
li jiao zhi tong shi xiao san die shi zhi hui fa fa ban wei rao fa zuo nei de xiao zhou xuan zhuan de zhi hui fa die shi zhi hui fa jie gou jian dan zhi neng an zhuang zai shui ping guan
进出口通道方向与阀座天龙八部科举答案通道方向垂直；立式升降式止回阀，其介质进出口通道方向与阀座通道方向相同，其流动阻
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，阀瓣靠介质推力开启，当介质停流时，阀瓣靠自垂降落在阀座上，起阻止介质逆流作用。直通式升降止回阀介质
fa ban kao jie zhi tui li kai qi dang jie zhi ting liu shi fa ban kao zi chui jiang luo zai fa zuo shang qi zu zhi jie zhi ni liu zuo yong zhi tong shi sheng jiang zhi hui fa jie zhi
阀瓣与截止阀相同。天龙八部科举答案阀瓣上部和阀盖下部加工有导向套简，阀瓣导向简可在阀盏导向简内自由升降，当介质顺流时
fa ban yu jie zhi fa xiang tong tian long ba bu ke ju da an fa ban shang bu he fa gai xia bu jia gong you dao xiang tao jian fa ban dao xiang jian ke zai fa zhan dao xiang jian nei zi you sheng jiang dang jie zhi shun liu shi
止回阀的阀体形状与截止阀一样（可与截止阀通用），因此它的流体阻力系数较大。其结构与截止阀相似，阀体和
zhi hui fa de fa ti xing zhuang yu jie zhi fa yi yang ke yu jie zhi fa tong yong yin ci ta de liu ti zu li xi shu jiao da qi jie gou yu jie zhi fa xiang si fa ti he
垂直中心线滑动的止回阀，升降式止回阀只能安装在水平管道上，在高压小口径止回阀上阀瓣可采用圆球。升降式
chui zhi zhong xin xian hua dong de zhi hui fa sheng jiang shi zhi hui fa zhi neng an zhuang zai shui ping guan dao shang zai gao ya xiao kou jing zhi hui fa shang fa ban ke cai yong yuan qiu sheng jiang shi
主要按阀门口天龙八部科举答案径来分，目的是为了防止介质停止流动或倒流时，减弱水力冲击。二、升降式止回阀：阀瓣沿着阀体
zhu yao an fa men kou tian long ba bu ke ju da an jing lai fen mu de shi wei le fang zhi jie zhi ting zhi liu dong huo dao liu shi jian ruo shui li chong ji er sheng jiang shi zhi hui fa fa ban yan zhe fa ti
径场合，但不宜用于脉动流，其密封性能不及升降式。旋启式止回阀分单瓣式、双瓣式和多半式三种，这三种形式
jing chang he dan bu yi yong yu mai dong liu qi mi feng xing neng bu ji sheng jiang shi xuan qi shi zhi hui fa fen dan ban shi shuang ban shi he duo ban shi san zhong zhe san zhong xing shi
通道的转轴作旋转运动，因阀内通道成天龙八部科举答案流线形，流动阻力比升降式止回阀小，适用于低流速和流动不常变化的大口
tong dao de zhuan zhou zuo xuan zhuan yun dong yin fa nei tong dao cheng tian long ba bu ke ju da an liu xian xing liu dong zu li bi sheng jiang shi zhi hui fa xiao shi yong yu di liu su he liu dong bu chang bian hua de da kou
（沿轴线移动）。止回阀根据其结构和安装方式可分：一、旋启式止回阀：旋启式止回阀的阀瓣呈圆盘状，绕阀座
yan zhou xian yi dong zhi hui fa gen ju qi jie gou he an zhuang fang shi ke fen yi xuan qi shi zhi hui fa xuan qi shi zhi hui fa de fa ban cheng yuan pan zhuang rao fa zuo
能升至超过系统压的辅助系统提供补给的管路上。止回阀主要天龙八部科举答案可分为旋启式止回阀（依重心旋转）与升降式止回阀
neng sheng zhi chao guo xi tong ya de fu zhu xi tong ti gong bu gei de guan lu shang zhi hui fa zhu yao tian long ba bu ke ju da an ke fen wei xuan qi shi zhi hui fa yi zhong xin xuan zhuan yu sheng jiang shi zhi hui fa
，其主要作用是防止介质倒流、防止泵及驱动电动机反转，以及容器介质的泄放。止回阀还可用于给其中的压力可
qi zhu yao zuo yong shi fang zhi jie zhi dao liu fang zhi beng ji qu dong dian dong ji fan zhuan yi ji rong qi jie zhi de xie fang zhi hui fa hai ke yong yu gei qi zhong de ya li ke
自动开、闭阀瓣，用来防止介质倒流的阀门，又称逆止阀、单向阀、逆流阀、和背压阀。止回天龙八部科举答案阀属于一种自动阀门
zi dong kai bi fa ban yong lai fang zhi jie zhi dao liu de fa men you cheng ni zhi fa dan xiang fa ni liu fa he bei ya fa zhi hui tian long ba bu ke ju da an fa shu yu yi zhong zi dong fa men
止回阀,逆止阀,单向阀,逆流阀,背压阀,底阀2007-4-2413:24止回阀是指依靠介质本身流动而
zhi hui fa , ni zhi fa , dan xiang fa , ni liu fa , bei ya fa , di fa 2007-4-2413:24 zhi hui fa shi zhi yi kao jie zhi ben shen liu dong er