Manual valve hman hunah chuan valve hawn a nih hunah chuan accident a thlen loh nan, valve hawn a nih chuan, force moderate chu ngaihven a ngai a ni. Manual valve hman dik chu hetiang hi a ni:
Valve chu a inhawng kim vek chuan, a kutphah chu a sir lehlamah tlem tal han herh tur a ni a, chu chuan thread-te chu a ti nghet a, a tizau a, a chhiat loh nan a veng thei bawk. Hetah hian stem sang chho zel hi ngaihven la, valve stem chu a hawn kim leh a khar kim hunah a awmna dik tak chu hre reng ang che, chutiang chuan top dead center chu a inhawng kim hunah a inhnaih loh nan. A khar kim hunah harsatna a awm lo em tih enfiah pawh a \\angkai hle. Valve disc chu a lo chhuak a nih chuan, emaw, valve core sealing part chu debris dang tam tak nen a inhmeh a nih chuan, a khar kim hunah rod awmna chu a danglam ang a, chu chuan valve sealing side emaw valve hand wheel pawh a tichhia ang.
Valve hawnna phenomenon: butterfly valve, ball valve leh plug valve stem chung bera groove chu channel nen a inmil chuan valve chu fully open position-ah a awm tihna a ni a Valve rod chu veilam emaw dinglam emaw℃90-a a inher chuan groove chu channel-ah vertical a ni a, chu chu valve chu fully closed position-ah a awm tihna a ni. Plug valve stem thenkhat top, butterfly valve, ball valve channel to channel leh wrench te chu parallel line ah open turin, stop atan vertical. Operation method pathum{-way leh pali-way reversing valve chu hawn, khar leh reversing mark angin kalpui tur a ni. A hnathawh tak tak hnuah chuan rotary handle chu lakchhuah tur a ni.
