Sɛ wode nsaano valve no redi dwuma a, ɛsɛ sɛ wode w’adwene si tumi a ɛkɔ fam no so bere a woabue valve no, na ɛnyɛ ahoɔden kɛse, sɛnea ɛbɛyɛ a ɛrekwati akwanhyia. Manual valves a wɔde di dwuma yiye no te sɛ nea edidi so yi:
Sɛ wobue valve no mu koraa a, ɛsɛ sɛ wɔdannan nsa no kakra wɔ ɔkwan a ɛne no bɔ abira so na ama nhama no ayɛ den na amma ansansan na ansɛe. Hwɛ dua a ɛreforo no wɔ ha no yiye, na kae sɛnea valve no dua no wɔ no pɛpɛɛpɛ bere a wɔabue mu koraa na wɔato mu koraa no, sɛnea ɛbɛyɛ a ɛremma ne mfinimfini awufo no mmɔ bere a wɔabue no koraa no. Ɛboa nso sɛ wobɛhwɛ sɛ ebia ɛnyɛ ɔhaw biara bere a wɔato mu koraa no. Sɛ valve disc no yɛ loose, anaasɛ valve core sealing part no fra nneɛma afoforo a ɛdɔɔso kakra a, poma no gyinabea bɛsesa bere a wɔato mu koraa no, na ɛde valve sealing no fã no aba anaasɛ valve nsa ntwahonan no nso asɛe.
The phenomenon of valve opening: Sɛ groove a ɛwɔ butterfly valve no dua no atifi, ball valve ne plug valve no ne channel no hyia a, ɛkyerɛ sɛ valve no wɔ gyinabea a ɛbue koraa; Sɛ valve abaa no dannan kɔ benkum anaa nifa so digrii 90 a, groove no gyina hɔ ma ɔkwan no, a ɛkyerɛ sɛ valve no wɔ gyinabea a wɔato mu koraa no mu. Ebinom plug valve stem top, butterfly valve, ball valve to channel ne wrench kɔ parallel line ma open, vertical ma gyinabea. Ɛsɛ sɛ wɔyɛ dwumadie kwan a ɛwɔ mmiɛnsa-way ne anan-way reversing valve no so sɛdeɛ agyiraeɛhyɛdeɛ a ɛkyerɛ sɛ wɔabue, wɔbɛto mu na wɔadan wɔn akyi no teɛ. Sɛ wɔyɛ adwuma ankasa wie a, ɛsɛ sɛ woyi rotary nsa no fi hɔ.
