Kuwoneka kwa valve ya mpira kunali pambuyo pa Nkhondo Yachiwiri Yadziko Lonse.Ngakhale kupangidwa kwa valavu ya mpira kunayambika koyambirira kwa zaka za zana la 20, patent yokhazikikayi idalephera kumaliza njira zake zamalonda chifukwa cha kuchepa kwamakampani opanga zida komanso makampani opanga makina.DuPont ku United States anatulukira pulasitiki yapamwamba polytetrafluoroethylene (PTFE) mpaka 1943. Mtundu uwu wa zinthu uli ndi ubwino wa mphamvu yokwanira yokhazikika komanso yopondereza, elastoplasticity, katundu wabwino wodzipangira okha komanso kukana dzimbiri, yomwe ili yoyenera kwambiri ngati zosindikizira ndipo zimakhala zodalirika kwambiri zosindikiza.Kuonjezera apo, mpira wokhala ndi kuzungulira kwakukulu ndi kutha kwabwino pamwamba ukhoza kupangidwa ngati membala wotsekedwa wa valve ya mpira chifukwa cha chitukuko cha makina opangira mpira.Mtundu watsopano wa valavu wokhala ndi chiboliboli chodzaza ndi 90 ° kuyenda mozungulira kozungulira umalowa pamsika wa valve, ndikukopa chidwi kwambiri.Zida zama valve zachikhalidwe monga ma valve oyimitsa, ma valve olowera pachipata, ma plug ndi ma valve agulugufe amasinthidwa pang'onopang'ono ndi ma valve a mpira, ndipo ma valve a mpira amagwiritsidwa ntchito kwambiri, kuyambira mainchesi ang'onoang'ono mpaka mainchesi akulu, kuthamanga kwapansi mpaka kuthamanga kwambiri, kutentha kwabwino mpaka kutentha kwambiri, kutentha kwambiri mpaka kutentha kochepa.Pakalipano, kutalika kwakukulu kwa valve ya mpira kufika pa 60 Inchi, ndipo kutentha kochepa kwambiri kumatha kufika kutentha kwa hydrogen -254 ℃. Kutentha kwakukulu kumatha kufika ku 850 mpaka 900 ℃.Zonsezi zimapanga ma valve a mpira oyenera mitundu yonse ya zofalitsa, zomwe zimakhala mtundu wodalirika kwambiri wa valve.

Mavavu a mpira amatha kugawidwa kukhala mavavu oyandama a mpira ndi ma valve a mpira wa trunnion potengera kapangidwe kake.

Mavavu a mpira amatha kugawidwa kukhala ma valve olowera pamwamba komanso ma valve olowera m'mbali.Ma valve olowera mbali amathanso kugawidwa m'magulu amodzi a mpira, mavavu amitundu iwiri ndi mavavu amitundu itatu molingana ndi kapangidwe ka valavu.Matupi a valve a mpira ndi ofunikira;mavavu amitundu iwiri amakhala ndi ma valavu akuluakulu ndi ma valavu othandizira ndipo mavavu amagulu atatu amapangidwa ndi thupi limodzi lalikulu la ma valve ndi matupi awiri othandizira.

Mavavu a mpira amatha kugawidwa m'magulu osindikizira a mpira wofewa komanso ma valve osindikizira olimba molingana ndi zida zosindikizira.Zida zosindikizira za mavavu osindikizira a mpira ndi zida zapamwamba za polima monga polytetrafluoroethylene (PTFE), polytetrafluoroethylene yolimbikitsidwa ndi nayiloni komanso mphira.Zida zosindikizira za ma valve osindikizira olimba ndi zitsulo.