龍岩止回閥

止回閥是指依靠介質本身流動而自動開、閉閥瓣
，用來防止介質倒流的閥門，又稱逆止閥
、單向閥
、逆流閥
、和背壓閥。止回閥屬於一種自動閥門
，其主要作用是防止介質倒流
、防止泵及驅動電動機反轉，以及容器介質的泄放。
止回閥還可用於給其中的壓力可能升至超過係統壓的輔助係統提供補給的管路上。止回閥主要可分為旋啟式止回閥（依重心旋轉）與升降式止回閥（沿軸線移動）。
止zhi回hui閥fa這zhe種zhong類lei型xing的de閥fa門men的de作zuo用yong是shi隻zhi允yun許xu介jie質zhi向xiang一yi個ge方fang向xiang流liu動dong，而er且qie阻zu止zhi反fan方fang向xiang流liu動dong。通tong常chang這zhe種zhong閥fa門men是shi自zi動dong工gong作zuo的de，在zai一yi個ge方fang向xiang流liu動dong的de流liu體ti壓ya力li作zuo用yong下xia，閥fa瓣ban打da開kai；流體反方向流動時，由流體壓力和閥瓣的自重合閥瓣作用於閥座
，從而切斷流動。
其qi中zhong止zhi回hui閥fa就jiu屬shu於yu這zhe種zhong類lei型xing的de閥fa門men，它ta包bao括kuo旋xuan啟qi式shi止zhi回hui閥fa和he升sheng降jiang式shi止zhi回hui閥fa。旋xuan啟qi式shi止zhi回hui閥fa有you一yi介jie鉸jiao鏈lian機ji構gou，還hai有you一yi個ge像xiang門men一yi樣yang的de閥fa瓣ban自zi由you地di靠kao在zai傾qing斜xie的de閥fa座zuo表biao麵mian上shang。為wei了le確que保bao閥fa瓣ban每mei次ci都dou能neng到dao達da閥fa座zuo麵mian的de合he適shi位wei置zhi
，閥fa瓣ban設she計ji在zai鉸jiao鏈lian機ji構gou，以yi便bian閥fa瓣ban具ju有you足zu夠gou有you旋xuan啟qi空kong間jian，並bing使shi閥fa瓣ban真zhen正zheng的de、全麵的與閥座接觸。閥瓣可以全部用金屬製成，也可以在金屬上鑲嵌皮革、橡膠、huozhecaiyonghechengfugaimian，zhequjueyushiyongxingnengdeyaoqiu。xuanqishizhihuifazaiwanquandakaidezhuangkuangxia，liutiyalijihubushouzuai，yincitongguofamendeyalijiangxiangduijiaoxiao。shengjiangshizhihuifadefabanzuoluoweiyufatishangfazuomifengmianshang。cifamenchulefabankeyiziyoudishengjiangzhiwai，qiyubufenrutongjiezhifayiyang，liutiyalishifabancongfazuomifengmianshangtaiqi
，jiezhihuiliudaozhifabanhuiluodaofazuoshang，bingqieduanliudong。genjushiyongtiaojian
，fabankeyishiquanjinshujiegou，yekeyishizaifabanjiashangxiangqianxiangjiaodianhuoxiangjiaohuandexingshi。xiangjiezhifayiyang，liutitongguoshengjiangshizhihuifadetongdaoyeshixiazhaide，yincitongguoshengjiangshizhihuifadeyalijiangbixuanqishizhihuifadaxie
，erqiexuanqishizhihuifadeliuliangshoudaodexianzhihenshao。