Valavu ya mpira wamafuta ndi mtundu watsopano wa valve ya mpira.Ili ndi maubwino ena apadera pamapangidwe ake, monga kusagundana pa switch, kusavala ndi kung'ambika pa chisindikizo, komanso torque yaying'ono yotsegula & kutseka.Amagwiritsidwa ntchito kwambiri m'malo ogwirira ntchito omwe amafunikira kudulidwa mwamphamvu, monga manyuchi, chokoleti, phala ndi mankhwala a tsiku ndi tsiku.