止(zhi)回(hui)閥(fa)一般(ban)適用(yong)(yong)于(yu)清凈介(jie)(jie)(jie)(jie)質(zhi)(zhi)(zhi)，不宜用(yong)(yong)于(yu)含有固(gu)體(ti)顆粒和粘度較大的介(jie)(jie)(jie)(jie)質(zhi)(zhi)(zhi)。當(dang)(dang)DN≤40mm時(shi)，宜采(cai)(cai)用(yong)(yong)升降止(zhi)回(hui)閥(fa)(僅允許安裝(zhuang)(zhuang)(zhuang)在水(shui)(shui)平(ping)管道(dao)上(shang))當(dang)(dang)DN=50~400mm時(shi)，宜采(cai)(cai)用(yong)(yong)旋啟式升降止(zhi)回(hui)閥(fa)(在水(shui)(shui)平(ping)和垂直管道(dao)上(shang)都可安裝(zhuang)(zhuang)(zhuang)，如安裝(zhuang)(zhuang)(zhuang)在垂直管道(dao)上(shang)介(jie)(jie)(jie)(jie)質(zhi)(zhi)(zhi)流(liu)向要由下而上(shang))當(dang)(dang)DN≥450mm時(shi)，宜采(cai)(cai)用(yong)(yong)緩(huan)沖型止(zhi)回(hui)閥(fa):當(dang)(dang)DN=100~400mm也可選用(yong)(yong)對夾(jia)式止(zhi)回(hui)閥(fa):旋啟式止(zhi)回(hui)閥(fa)可以做成很高的工(gong)作壓力，PN可以達到42MPa根據殼體(ti)及密封(feng)件(jian)的材質(zhi)(zhi)(zhi)不同可適用(yong)(yong)于(yu)任(ren)何工(gong)作介(jie)(jie)(jie)(jie)質(zhi)(zhi)(zhi)和任(ren)何工(gong)作溫度范圍。介(jie)(jie)(jie)(jie)質(zhi)(zhi)(zhi)為水(shui)(shui)、蒸(zheng)汽、氣(qi)體(ti)、腐蝕性(xing)介(jie)(jie)(jie)(jie)質(zhi)(zhi)(zhi)、油品(pin)、藥品(pin)等。介(jie)(jie)(jie)(jie)質(zhi)(zhi)(zhi)工(gong)作溫度范在-196~800℃之間。