Valavu ya pulagi

Vavu yolumikizira ndi yofunika kwambiri pakugwira ntchito yolimbitsa simenti ndi kusweka m'minda yamafuta ndi migodi komanso njira yofanana yowongolera madzi othamanga kwambiri. Ili ndi kapangidwe kakang'ono, kukonza kosavuta, mphamvu yochepa, kutsegula mwachangu komanso kugwira ntchito mosavuta kotero kuti ndi valavu yabwino kwambiri pakati pa manifolds olimbitsa simenti ndi kusweka pakadali pano. (Ndemanga: valavu imathanso kutsegulidwa kapena kutsekedwa mosavuta pansi pa 10000psi.)