Vim tias lub caij nplooj ntoos hlav valve tau raug torsion thaum nws ua haujlwm, qhov kev ntxhov siab ntawm nws cov voj voog tsis sib xws. Los ntawm qhov chaw nyob ze ntawm qhov chaw mus rau txhua qhov chaw ntawm ntug, qhov kev ntxhov siab maj mam nce, thiab kev ntxhov siab ntawm qhov chaw yog ntau dua. Nyob rau hauv cov nqe lus ntawm cov ntsiab lus saum npoo, qhov zoo sab hauv yog raug rau kev ntxhov siab ntau dua thiab raug rau lub dav hlau kev ntxhov siab. Vim li no, ib zaug lub valve lub caij nplooj ntoos hlav deg tsis zoo, nws muaj peev xwm ua kom muaj kev ntxhov siab ntau dua ntawm qhov tsis xws luag, uas ua rau lub caij nplooj ntoos hlav tawg thaum ntxov.
Cov laj thawj rau lub valve springs tawg, ntxiv rau kev tsim khoom tsis raug, kuj tseem tuaj yeem ua rau lawv raug kev puas tsuaj thaum ntxov vim yog siv tsis raug. Cov laj thawj feem ntau yog cov hauv qab no:
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