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升降式止回閥

升(sheng)降止(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)產品簡介(jie)：止(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)按結構劃分，可分為(wei)升(sheng)降式(shi)止(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)、旋(xuan)啟式(shi)止(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)、碟(die)止(zhi)(zhi)(zhi)回(hui)這3種。升(sheng)降止(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)可分為(wei)立式(shi)和臥式(shi)的這兩種。旋(xuan)啟式(shi)止(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)分為(wei)單瓣式(shi)、雙瓣式(shi)和多瓣式(shi)。蝶止(zhi)(zhi)(zhi)回(hui)是直通式(shi)。以上幾種止(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)在連接(jie)形(xing)式(shi)上可分為(wei)螺紋連接(jie)、法蘭連接(jie)和焊接(jie)。

升(sheng)降止(zhi)回閥(fa)的結構(gou)與截止(zhi)閥(fa)相(xiang)似，其閥(fa)瓣(ban)沿著通(tong)道(dao)中以線作升(sheng)降運(yun)動，動作可(ke)靠(kao)，但流體阻力較大，適用于輕小(xiao)的口徑(jing)的場(chang)合。升(sheng)降式(shi)止(zhi)回閥(fa)可(ke)直(zhi)通(tong)式(shi)和立式(shi)。直(zhi)通(tong)式(shi)一般安裝(zhuang)在水平管(guan)路中，立式(shi)一般安裝(zhuang)在垂直(zhi)管(guan)道(dao)中。

旋(xuan)(xuan)啟式止(zhi)(zhi)回(hui)閥的(de)(de)(de)閥瓣繞(rao)轉軸作(zuo)旋(xuan)(xuan)轉運(yun)動，其流體阻力一(yi)般小于(yu)升降式止(zhi)(zhi)回(hui)閥，適(shi)用(yong)(yong)于(yu)較大(da)口(kou)(kou)徑的(de)(de)(de)管道中(zhong)(zhong)(zhong)，旋(xuan)(xuan)啟式止(zhi)(zhi)回(hui)閥可(ke)根據閥瓣數(shu)目分為單(dan)(dan)瓣，雙瓣及多瓣，單(dan)(dan)瓣旋(xuan)(xuan)啟式止(zhi)(zhi)回(hui)閥一(yi)般適(shi)用(yong)(yong)于(yu)中(zhong)(zhong)(zhong)等口(kou)(kou)徑的(de)(de)(de)管路中(zhong)(zhong)(zhong)，大(da)口(kou)(kou)徑管路選用(yong)(yong)單(dan)(dan)瓣旋(xuan)(xuan)啟式止(zhi)(zhi)回(hui)閥，為了減少(shao)水(shui)錘壓力，好采(cai)用(yong)(yong)能減少(shao)水(shui)錘壓力的(de)(de)(de)緩閉止(zhi)(zhi)回(hui)閥。雙瓣旋(xuan)(xuan)啟式止(zhi)(zhi)回(hui)閥適(shi)用(yong)(yong)于(yu)中(zhong)(zhong)(zhong)大(da)口(kou)(kou)徑管路中(zhong)(zhong)(zhong)。

蝶(die)止回(hui)的結(jie)(jie)構類(lei)似于蝶(die)閥，其結(jie)(jie)構簡單，流阻較小，水錘壓(ya)力小的管路中(zhong)。

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