Cut-off valve, tseem hu ua kaw, yog ib qho kev siv ntau tshaj, nws yog txais tos dav vim hais tias ntawm cov txheej txheem kaw ntawm lub qhov rooj sib khi nruab nrab ntawm kev sib txhuam me me, kuj ruaj khov, qhib qhov siab tsis yog me me, yooj yim tsim khoom lag luam, yooj yim los tswj, tsis tsuas yog siv rau nruab nrab thiab qis siab, tab sis kuj siv tau rau cov kev kub siab. Cut-off valve kaw txoj ntsiab cai yog cia siab rau lub siab ntawm lub pob valve, kom lub disc sealing nto thiab lub rooj zaum nplaim hluav taws xob kom nruj, tiv thaiv kev ntws tawm. Tuam Tshoj lub valve "peb mus rau" tau hais tias qhov kev txiav tawm ntawm qhov ntsuas mus rau qhov kev taw qhia ntawm kev siv ntawm sab saum toj-qis, yog li kev teeb tsa ntawm directional. Cut-off valve qauv ntev yog ntau dua li lub rooj vag kaw, thaum dej tsis kam yog loj, lub sijhawm ua haujlwm ntev, kev sib khi tsis ntseeg siab tsis muaj zog.
Raws li ib qho ntawm qhov tseem ceeb tshaj plaws kev txiav tawm, cov cut-off valve ua lub luag haujlwm tseem ceeb hauv thaj chaw aerospace. Raws li qhov tseem ceeb ntawm cov khoom siv hauv qhov chaw, txiav tawm lub ntsuas kom pom qhov ua haujlwm ntawm nruab nrab kev sib tw, txiav thiab hloov kho, thiab nws txoj kev sib khi ncaj qha cuam tshuam kev nyab xeeb thiab txhim khu kev ua haujlwm ntawm qhov chaw ua haujlwm nruab nrab. Cawv yam thiab txoj cai ntawm sealing cov yam ntxwv ntawm kev txiav tawm ntawm cov qhov qub tau kawm, thiab cov qauv tsim qauv ntawm lub foob dej yog qhov kev qhia los txhim kho qhov kev ua tau zoo ntawm sealing thiab kev ntseeg tau ntawm valve.
