Ivalve yesango lokutywina ethambileyo, ekwaziwa ngokuba yivalve yesango lesihlalo esilastiki, sisivalufa esisetyenziselwa ukuqhagamshela imibhobho yeendaba kunye nokutshintsha kubunjineli bogcino lwamanzi. Ulwakhiwo lwevalve yesango lokutywina oluthambileyo lunesihlalo, isivalo sevalve, ipleyiti yesango, isigqubuthelo soxinzelelo, isiqu, ivili lesandla, igasket, ...
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