Lub luag haujlwm tseem ceeb ntawm lub tshuab lim huab cua yog los ntes cov hmoov av thiab ua kom huv ntawm huab cua.
Los ntawm kev siv cov ntaub ntawv ntim pom, huab cua lim ua kom muaj plua plav los ntawm cov roj-tawv ob-theem ntws, yog li ua kom huv cov roj. Nws pom ntau cov kev siv hauv cov ntaub ntawv huv si huv si, chaw ua haujlwm huv, thiab cov kev ua haujlwm, thiab kev tiv thaiv huv si rau hluav taws xob, tshuab, thiab khoom siv khoom siv. Cov lim cua tseem ua cov haujlwm tseem ceeb hauv tsheb, engineering locomotives, thiab lwm cov kev ua liaj ua teb, thiab lwm yam kev cuam tshuam ntawm cov cua kom huv si rau cov thooj voos kheej kheej. This prevents the inhalation of suspended dust into the cylinders, which could otherwise accelerate wear and tear on piston assemblies and cylinders, and avoids the phenomenon of "scoring" caused by larger particles entering the space between the piston and cylinder. Tsis tas li ntawd, huab cua lim kom yeem txo cov kev xav ntawm cov neeg muaj kev noj qab haus huv, cov neeg saib xyuas kev nyab xeeb rau cov neeg saib xyuas kev noj qab haus huv, thiab ua kom muaj pa zoo nyob rau hauv tsheb.