Plhaub cov khoom ntawm lub kaum sab xis valve: lub kaum sab xis yog muab faib ua tooj dag, alloy, hlau, yas thiab lwm yam raws li cov khoom siv plhaub. Brass yog ib qho yooj yim rau txheej txheem, muaj zog plasticity, hardness, thiab muaj zog dabtsi yog khoov thiab torsion kuj; tus nqi ntawm cov hlau tsis tshua muaj, tab sis qhov tsis zoo yog qhov khoov thiab torsion tsis kam, thiab qhov saum npoo yog yooj yim rau oxidize; hlau yog ib qho yooj yim rau xeb thiab tej zaum yuav pollute cov dej. Nyob rau niaj hnub no tus phooj ywg environmentally thiab low-carbon zej zog Tsis pom zoo; yas tsis tshua muaj nqi thiab tsis yooj yim rau siv nyob rau sab qaum teb txias heev.
