Chitsanzo choyambirira chofanana ndivalavu ya mpirandi valavu yovomerezeka ndi John Warren mu 1871. Ndi valavu yokhala ndi zitsulo yokhala ndi mpira wamkuwa ndi mpando wamkuwa. Pambuyo pake Warren adapereka chiphaso chake cha valve ya mpira wamkuwa kwa John Chapman, wamkulu wa Chapman Valve Company. Ziribe chifukwa chake, Chapman sanayikepo mapangidwe a Warren pakupanga. M'malo mwake, iye ndi ena opanga ma valve akhala akugwiritsa ntchito mapangidwe akale kwa zaka zambiri.

Ma valve a mpira, omwe amadziwikanso kuti mavavu a tambala a mpira, adagwira nawo ntchito pankhondo yachiwiri yapadziko lonse. Panthawi imeneyi, mainjiniya adapanga izi kuti zigwiritsidwe ntchito pamakina amafuta ankhondo. Pambuyo kupambana kwama valve a mpiramu Nkhondo Yachiwiri Yadziko Lonse, mainjiniya adagwiritsa ntchito mavavu a mpira pamafakitale.

Chimodzi mwazofunikira kwambiri zokhudzana ndi ma valve a mpira m'zaka za m'ma 1950 chinali chitukuko cha Teflon ndi kugwiritsidwa ntchito kwake monga zida za valve mpira. Pambuyo pa chitukuko chabwino cha Teflon, mabizinesi ambiri monga DuPont adakhala ndi ufulu wogwiritsa ntchito, chifukwa adadziwa kuti Teflon ikhoza kubweretsa phindu lalikulu pamsika. Pamapeto pake, makampani opitilira imodzi adakwanitsa kupanga ma valve a Teflon. Ma valve a mpira wa Teflon amatha kusinthasintha ndipo amatha kupanga zisindikizo zabwino mbali ziwiri. M'mawu ena, iwo ndi bidirectional. Komanso ndi umboni wotayikira. Mu 1958, Howard Freeman anali wopanga woyamba kupanga valavu ya mpira yokhala ndi mpando wosinthika wa Teflon, ndipo mapangidwe ake anali ovomerezeka.

Masiku ano, ma valve a mpira apangidwa m'njira zambiri, kuphatikizapo kugwirizanitsa kwawo ndi ntchito zomwe zingatheke. Kuphatikiza apo, amatha kugwiritsa ntchito makina a CNC ndi mapulogalamu apakompyuta (monga mtundu wa Button) kuti apange mavavu abwino kwambiri. Posakhalitsa, opanga ma valve a mpira adzatha kupereka zosankha zambiri za mankhwala awo, kuphatikizapo zomangamanga za aluminiyamu, kuvala pang'ono komanso mphamvu zothamanga kwambiri, zomwe zimalola ogwira ntchito kuti adutse kuchuluka kwamadzimadzi kudzera mu valve pamlingo wochepa wothamanga.

ntchito

Cholinga cha valve ya mpira ndikuwongolera kutuluka kwamadzimadzi. Angachite zimenezi m’njira zambiri. Amatha kusintha mitundu ina ya ma valve otsika otsika, kupereka chitetezo chobwerera mmbuyo kwa ma valve okhala ndi ma swing cheke misonkhano, kupatula dongosolo, ndikupereka kutsekedwa kwathunthu kwa oyendetsa zida.

Chifukwa amatha kuwongoleredwa pamanja kapena pamagetsi, ma valve a mpira amatha kugwiritsa ntchito mapulogalamu osiyanasiyana.

Nthawi zambiri, ma valve a mpira amagwiritsidwa ntchito potsegula ndi kutseka mapaipi okhala ndi zolimba zoyimitsidwa, slurries, zakumwa kapena mpweya. Ntchito zina zomwe ma valve a mpira amagwiritsidwa ntchito mofala ndi monga mapaipi, zida, ndi zida pafupifupi m'mafakitale onse omwe amanyamula madzi. Mutha kuwapeza paliponse kuyambira pansi pafakitale mpaka pampopi kunyumba kwanu. Mafakitale ogwiritsama valve a mpirazikuphatikizapo kupanga, migodi, mafuta ndi gasi, ulimi, Kutentha ndi kuzirala, mafakitale ndi nyumba mapaipi, madzi, ogula katundu, zomangamanga, etc.