Mavavu ndi zida zamapaipi zomwe zimagwiritsidwa ntchito potsegula ndi kutseka mapaipi, kuwongolera kuyenda, kusintha ndi kuwongolera magawo (kutentha, kuthamanga, ndi kutuluka) kwa sing'anga yotumizira. Malingana ndi ntchito yake, ikhoza kugawidwa kukhala valve yotseka, valve yowunikira, valve yoyendetsa, ndi zina zotero.

Valve ndi gawo lowongolera mumayendedwe otumizira madzimadzi, omwe ali ndi ntchito zodulira, kuwongolera, kusokoneza, kupewa kubweza, kukhazikika, kusokoneza kapena kusefukira, komanso kuchepetsa kupanikizika. Mavavu omwe amagwiritsidwa ntchito m'makina owongolera madzimadzi, kuyambira ma valve osavuta otseka mpaka ovuta kwambiri omwe amagwiritsidwa ntchito pamakina owongolera okha, amakhala ndi mitundu yosiyanasiyana komanso mawonekedwe.

Mavavu amatha kugwiritsidwa ntchito kuwongolera kutuluka kwamitundu yosiyanasiyana yamadzimadzi monga mpweya, madzi, nthunzi, zotengera zosiyanasiyana zowononga, matope, mafuta, zitsulo zamadzimadzi, ndi media radioactive. Mavavu amagawidwanso kukhala mavavu achitsulo, mavavu achitsulo, mavavu osapanga dzimbiri, chromium-molybdenum zitsulo mavavu, chromium-molybdenum vanadium zitsulo mavavu, duplex zitsulo mavavu, mavavu pulasitiki, sanali muyezo makonda mavavu, etc. malinga ndi zipangizo zawo.