Icyuma cyumupira wumupira ni ubwoko bushya bwa valve ikoreshwa cyane. Ihame ryakazi ryumupira wumupira wumuringa nuguhinduranya intoki kugirango ikore valve itabujijwe cyangwa ihagaritswe. Ibyuma byumupira wumuringa byoroshye guhinduranya, bito mubunini, birashobora gukorwa mubipimo binini, bifite kashe yizewe, imiterere yoroshye, no kuyitaho byoroshye. Ubuso bwa kashe hamwe nubuso bwa serefegitura burigihe muburyo bufunze kandi ntibishobora kwangirika byoroshye. Zikoreshwa cyane mu nganda zitandukanye.