Raws li daim ntawv tsav tsheb, nws muab faib ua tsis siv neeg valve thiab tsav valve.
Tsis siv neeg valve: ua los ntawm lub peev xwm ntawm qhov nruab nrab nws tus kheej
Tsav valve: suav nrog phau ntawv, hluav taws xob, pneumatic, hydraulic, thiab lwm yam.
