Ivalve engekho semgangathweni luhlobo lwevalve ngaphandle kwemigangatho ecacileyo yokusebenza. Iiparamitha zayo zokusebenza kunye nemilinganiselo zilungiselelwe ngokukodwa ngokweemfuno zenkqubo. Iyakwazi ukuyilwa kwaye iguqulwe ngokukhululekileyo ngaphandle kokuchaphazela ukusebenza kunye nokhuseleko. Nangona kunjalo, inkqubo yomatshini isalandela izibonelelo ezifanelekileyo zomgangatho wesizwe.

Uyilo lweevalvu ezingezizo ezisemgangathweni kufuneka luthathele ingqalelo ingqiqo kunye nokuba nokwenzeka ngokupheleleyo. Ukongeza kokuthembela kwiithiyori zemveli, uyilo nalo lufuna uphando olutsha kunye nophuhliso. Ke ngoko, ngokuqhelekileyo, kukho abaphezulu kwishishini ukugqiba umsebenzi ofanayo, kwaye iinjineli ziya kunikezela ngemizobo emva kokuba uyilo lugqityiwe.

Iindidi zeevalvu ezingezizo ezisemgangathweni zohlulwe zibe luluhlu lwevalve yelindle (isango lepenstock kunye nevalve yeflap) kunye nothotho lwevalve yesinyithi (ivalve yebhabhathane yokuphefumla, ivalve yesilayidi yesango, ivalve yegogi, ivalve yokukhupha uthuthu, njl.njl.)

1. Uluhlu lwevalve yogutyulo

2. Uluhlu lwevalvu yesinyithi