Classified los ntawm nominal txoj kab uas hla
· Me txoj kab uas hla li qub: li qub nrog nominal loj Tsawg dua los yog sib npaug rau DN40.
· Nruab nrab txoj kab uas hla li qub: li qub nrog nominal ntau thiab tsawg dua los yog sib npaug rau DN50 ~ Tsawg dua los yog sib npaug rau DN300.
·Large diameter valves: valves with nominal sizes >DN350 ~ Tsawg dua lossis sib npaug rau DN1200.
·Extra large diameter valves: valves with nominal size >DN 1400 Nws.
Classified los ntawm nominal siab
· Lub tshuab nqus tsev vacuum: lub valve uas nws lub siab ua haujlwm qis dua tus qauv atmospheric siab.
· Tsis tshua muaj siab valve: valve nrog nominal siab Tsawg dua los yog sib npaug rau PN16.
·Medium pressure valve: valve with nominal pressure>PN16 ~ Tsawg dua lossis sib npaug rau PN100
·High-pressure valve: valve with nominal pressure >PN100 ~ Tsawg dua lossis sib npaug rau PN 1000.
· Ultra-siab siab valve: valve nrog nominal siab> PN1000.
