Ma valve owunika, ma valve osabwerera, adapangidwa kuti aletse kusinthika kwa kayendedwe ka mapaipi.Ma valve awa amayendetsedwa ndi zinthu zomwe zikuyenda mu payipi.Kutseka kumatheka ndi kulemera kwa makina a chekeni, ndi kupanikizika kwa msana, ndi kasupe, kapena mwa kuphatikiza njirazi.

valavu yowunika kuthamanga kwambiri  ndi ang'onoang'ono ang'onoang'ono owunika ma valve, omwe amapangidwa ndi chitsulo chonyezimira.we nthawi zambiri timawapanga mu swing check valve, piston check valve (lift check valve).Amapezeka m'mapangidwe atatu a bonnet.Mapangidwe oyamba ndi Bolted Bonnet, yokhala ndi cholumikizira chachimuna ndi chachikazi, chopangidwa ndi F316L/graphite.mphete olowa gasket ziliponso pa pempho.Mapangidwe achiwiri ndi boneti wowotcherera, wokhala ndi ulusi wowotcherera komanso wosindikizira.Mukapempha cholumikizira champhamvu cholowera chilipo, kapangidwe komaliza ndi boneti yosindikizira, yomwe ndi kapangidwe ka mavavu othamanga kwambiri.