Ukusetyenziswa kwenqanawa kunye neqonga elingaphesheya
Kukho iindidi ngeendidi zezifudumezi zombane zokuntywiliselwa ukusebenza elwandle: i-flanged, i-circulation kunye ne-over-the-side.
Isifudumezi-manzi saselwandle esijikelezayo sidla ngokuba nesifudumezi esinecala, ivalve kunye necasing (Umfanekiso 3).Ukunyuswa (ukuhamba okuthe nkqo okanye okuthe tye) kwesifudumezisi esijikelezayo kuxhomekeke kwisicelo.