I-valve ye-butterfly ye-U-section i-Bidirectional sealing, ukusebenza okuhle kakhulu, inani elincane le-torque, lingasetshenziswa ekupheleni kwepayipi ukukhipha i-valve, ukusebenza okuthembekile, indandatho yophawu lwesihlalo kanye nomzimba we-valve kuhlanganiswe ndawonye, ukuze i-valve ibe nesikhathi eside. impilo yesevisi