Hydraulic li qub yog cov khoom tseem ceeb hauv hydraulic systems. Cov li qub no tswj cov dej ntws, siab, thiab kev taw qhia ntawm cov kua dej hydraulic, ua rau lawv tseem ceeb heev rau kev ua haujlwm zoo thiab nyab xeeb ntawm cov tshuab thiab khoom siv. Muaj ntau ntau hom hydraulic li qub, txhua tus nrog lawv cov kev faib tshwj xeeb raws li cov yam ntxwv sib txawv.
Thawj hom hydraulic valve yog qhov taw qhia tswj valve. Cov li qub no yog tsim los tswj cov dej ntws thiab cov kev taw qhia ntawm cov kua dej hauv hydraulic system. Lawv feem ntau pom muaj nyob rau hauv cov khoom siv hnyav thiab tshuab, xws li cranes, excavators, thiab bulldozers. Directional tswj li qub tuaj nyob rau hauv ob hom, spool-type thiab poppet-type. Spool-type li qub yog siv rau cov ntawv thov uas tsis tshua muaj siab thiab muaj cov zawv zawg zawv zawg uas hloov pauv los npog lossis nthuav tawm cov chaw nres nkoj tshwj xeeb. Ntawm qhov tod tes, poppet-hom li qub yog siv rau cov ntawv thov siab thiab siv lub caij nplooj ntoos hlav-loaded poppet rau kev tswj ntws.
Lwm hom hydraulic valve yog lub siab tswj valve. Cov li qub no tswj lub siab ntawm hydraulic kua hauv lub cev thiab xyuas kom meej tias cov tshuab thiab cov khoom siv ua haujlwm ntawm cov qib siab tsim nyog. Lub siab tswj li qub tuaj yeem raug cais raws li kev ua haujlwm ncaj qha lossis tsav ua haujlwm. Direct-acting li qub siv lub poppet los yog spool los tswj cov kua dej, thaum tsav-ua li qub xav tau ib qho kev tsav tsheb sab nraud los tswj cov qib siab.
Flow tswj li qub yog lwm yam tseem ceeb ntawm hydraulic valve. Cov li qub no tswj tus nqi ntawm cov dej ntws hauv hydraulic system. Lawv feem ntau pom muaj nyob rau hauv lub tog raj kheej, lub cev muaj zog, thiab cov twj tso kua mis, thiab lawv xyuas kom meej tias cov khoom no ua haujlwm ntawm kev tswj ceev. Flow tswj li qub tuaj nyob rau hauv ob hom, tsau thiab adjustable. Fixed flow control li qub tuav tus nqi ntws tsis tu ncua, thaum kho cov li qub tso cai rau kev hloov pauv hloov pauv.
Hauv kev xaus, hydraulic li qub yog ib qho tseem ceeb hauv cov tshuab hydraulic, pab txhawb kev ua haujlwm zoo ntawm cov tshuab thiab khoom siv. Kev faib tawm kom raug thiab xaiv cov hydraulic li qub yog qhov tseem ceeb rau cov khoom siv kev ntseeg siab, kev ua tau zoo, thiab kev nyab xeeb. Thaum kawg, kev nkag siab txog ntau hom hydraulic li qub thiab lawv cov kev faib tawm yuav pab xaiv qhov tsim nyog tshaj plaws rau txhua qhov hydraulic system.
