Kev nyab xeebib lub dab tsi uas qhib thiab kaw4.5A25 yog lub valve tshwj xeeb uas ib txwm kaw hauv qab kev ua ntawm sab nraud quab yuam. Thaum lub taub nruab nrab hauv cov cuab yeej lossis cov raj xa dej dhau ntawm cov nqi teev tseg, qhov nruab nrab ntawm cov raj hluav taws xob lossis cov khoom siv tuaj yeem tiv thaiv los ntawm kev tshaj tawm tus nqi tshwj xeeb los ntawm kev rho tawm cov nruab nrab mus rau sab nraud ntawm lub system. Valve valve yog ib lub valve tsis siv neeg lub valve, uas yog tsuas yog siv nyob rau hauv boilers, cov hlab ntsha siab thiab cov raj xa dej siab. Kev tswj hwm kev tswj hwm tsis tshaj li tus nqi teev, uas yog lub luag haujlwm tseem ceeb hauv kev tiv thaiv kev nyab xeeb ntawm tus kheej thiab khoom siv. Kev tiv thaiv kev nyab xeeb valve tsuas yog siv tau tom qab kev kuaj mob siab.
Valve valve 4.5A25 ua si lub luag haujlwm tiv thaiv hauv lublub tshuab tsim fai fabHydrogen tswj system. Thaum lub kaw lus siab ntau dua qhov tau teev tseg tus nqi, lub kaw lus kev nyab xeeb yuav qhib ntau dua li cov kab ke tsis muaj nqi, yog li kom ntseeg tau tias lub zog yuav tsis muaj kev raug xwm txheej vim kev kub siab dhau.