Chitsanzo choyambirira chofanana ndi chavalavu ya mpiraNdi valavu yopangidwa ndi John Warren mu 1871. Ndi valavu yokhala ndi chitsulo yokhala ndi mpira wa mkuwa ndi mpando wa mkuwa. Pomaliza pake Warren adapereka patent yake ya kapangidwe ka valavu ya mpira wa mkuwa kwa John Chapman, mtsogoleri wa Chapman Valve Company. Kaya chifukwa chake chinali chiyani, Chapman sanagwiritse ntchito kapangidwe ka Warren. M'malo mwake, iye ndi opanga mavalavu ena akhala akugwiritsa ntchito mapangidwe akale kwa zaka zambiri.

Ma valve a mpira, omwe amadziwikanso kuti ma valve a ball cock, adagwira ntchito panthawi ya Nkhondo Yachiwiri Yapadziko Lonse. Pa nthawiyi, mainjiniya adapanga kuti agwiritsidwe ntchito mumakina amafuta a ndege zankhondo. Pambuyo pa kupambana kwamavavu a mpiraMu Nkhondo Yachiwiri Yapadziko Lonse, mainjiniya anagwiritsa ntchito ma valve a mpira ku mafakitale.

Chimodzi mwa zinthu zofunika kwambiri zokhudzana ndi ma valve a mpira m'zaka za m'ma 1950 chinali kupanga Teflon ndi kugwiritsa ntchito kwake ngati valavu ya mpira. Pambuyo pa kupanga bwino kwa Teflon, mabizinesi ambiri monga DuPont adapikisana kuti agwiritse ntchito, chifukwa ankadziwa kuti Teflon ikhoza kubweretsa phindu lalikulu pamsika. Pomaliza pake, makampani ambiri adatha kupanga ma valve a Teflon. Ma valve a mpira wa Teflon ndi osinthasintha ndipo amatha kupanga zisindikizo zabwino mbali ziwiri. Mwa kuyankhula kwina, ndi a mbali ziwiri. Amathanso kutayikira. Mu 1958, Howard Freeman anali wopanga woyamba kupanga valavu ya mpira yokhala ndi mpando wa Teflon wosinthasintha, ndipo kapangidwe kake kanapatsidwa patent.

Masiku ano, ma valve a mpira apangidwa m'njira zambiri, kuphatikizapo kugwirizana kwawo ndi zinthu zomwe angathe kugwiritsa ntchito. Kuphatikiza apo, amatha kugwiritsa ntchito makina a CNC ndi mapulogalamu apakompyuta (monga Button model) kuti apange ma valve abwino kwambiri. Posachedwapa, opanga ma valve a mpira adzatha kupereka zosankha zambiri pazinthu zawo, kuphatikizapo kapangidwe ka aluminiyamu, kuchepa kwa kuwonongeka komanso kuthekera kwakukulu kozungulira, zomwe zimathandiza ogwiritsa ntchito kudutsa madzi osiyanasiyana kudzera mu valve pamlingo wochepa wa kuyenda.

ntchito

Cholinga cha valavu ya mpira ndikuwongolera kuyenda kwa madzi. Angathe kuchita izi m'njira zambiri. Angathe kusintha mitundu ina ya mavalavu otsika, kupereka chitetezo cha kubwerera kwa mavalavu pogwiritsa ntchito ma swing check assemblies, kupatula makinawo, ndi kutseka kwathunthu kwa ogwiritsa ntchito zida.

Popeza amatha kuwongoleredwa pamanja kapena pamagetsi, ma valve a mpira amatha kugwiritsidwa ntchito m'malo osiyanasiyana.

Nthawi zambiri, ma valve a mpira amagwiritsidwa ntchito kutsegula ndi kutseka mapaipi okhala ndi zinthu zolimba zopachikidwa, matope, zakumwa kapena mpweya. Ntchito zina zomwe ma valve a mpira amagwiritsidwa ntchito nthawi zambiri zimaphatikizapo mapaipi, zida, ndi zida pafupifupi m'mafakitale onse omwe amanyamula madzi. Mutha kuwapeza kulikonse kuyambira pansi pa fakitale mpaka pampopi m'nyumba mwanu. Makampani omwe amagwiritsa ntchitomavavu a mpirazikuphatikizapo kupanga zinthu, migodi, mafuta ndi gasi, ulimi, kutentha ndi kuziziritsa, mapaipi a mafakitale ndi apakhomo, madzi, katundu wogwiritsidwa ntchito, zomangamanga, ndi zina zotero.