Balofo ea bolo ea letsoho, belofo ea serurubele le valve ea plug ke mofuta o tšoanang oa belofo. Phapang ke hore karolo e koalang ea valve ea bolo ke bolo, e potolohang ho potoloha moeli o bohareng oa 'mele oa valve ho finyella ho bula le ho koala. Balofo ea bolo e sebelisoa haholo ho khaola, ho aba le ho fetola tsela ea phallo ea seaplane ho phaephe. Sephahla se nang le likarolo tse tharo ke mofuta o mocha oa valve o 'nileng oa sebelisoa haholo lilemong tsa morao tjena. Li-valve tsa mofuta ona hangata li lokela ho kenngoa ka mokhoa o otlolohileng phapeng.

Setulo sa li-valve tsa NSW se na le ts'ebetso e ntle ea ho tiisa. Lesale la ho tiisa la valve ea bolo hangata le entsoe ka thepa ea elastic e kang PTFE (RPTFE, NYLON, DEVLON, PEEK joalo-joalo). Mohaho o bonolo oa ho tiisa ho bonolo ho tiisa ho tiisa, 'me ha khatello e bohareng e ntse e eketseha, matla a ho tiisa a valve ea bolo a eketseha. The stem seal e ka tšeptjoa. Ha valve ea bolo e buloa le ho koaloa, kutu ea valve e potoloha feela 'me ha e tsamaee holimo le tlase. The valve stem packing seal ha ho bonolo ho senyeha. Matla a ho tiisa a valve stem reverse seal a eketseha ka ho eketseha ha khatello e mahareng. Hobane PTFE le lisebelisoa tse ling li na le thepa e ntle ea ho itšehla thajana, tšenyo ea likhohlano ka bolo ea valve ea bolo e nyane, 'me valve ea bolo e na le bophelo bo bolelele ba ts'ebeletso. Mokhoa oa ts'ebeliso o ka ba le lisebelisoa tsa pneumatic, motlakase, hydraulic le mekhoa e meng ea ho khanna ho lemoha taolo ea hole le ts'ebetso ea othomathike. Mocha oa valve oa bolo o boreleli 'me o ka tsamaisa maro a viscous, slurries le likaroloana tse tiileng.

Balofo ea bolo e phaphametseng ka letsoho ke mofuta oa valve o tsoileng lilemong tsa bo-1950. Ka halofo ea lekholo la lilemo, valve ea bolo e se e fetohile sehlopha se seholo sa li-valve. Balofo ea bolo e sebelisoa haholo ho khaola kapa ho hokahanya sehare, hape e ka sebelisoa bakeng sa tokiso le taolo ea mokelikeli. The Segment ball valve (V notch ball valve) e ka etsa phetoho e nepahetseng ea phallo le taolo, 'me valve ea litsela tse tharo e sebelisetsoa ho aba sehare le ho fetola tsela ea phallo ea seaplane. Li-valve tsa bolo ea matsoho li bitsoa haholo-holo ho latela mokhoa oa ho khanna oa valve ea bolo ka ho fetola lebili la letsoho kapa mofeng.