Ilungele iivalvu ukusuka kwi-6mm (4in) ukuya kwi-101mm (4in) ububanzi, ilungele imibhobho egqunyiweyo kunye nemigama esondeleyo (1/4in).
Umsebenzi
Isixhobo sokutshixa sisixhobo sokutshixa sokhuseleko kwimizi-mveliso esibamba izixhobo kwindawo ekhuselekileyo kwaye sihlale sivaliwe. Isetyenziselwa ukuthintela utyando olunokuthi lubangele ukwenzakala okanye ukufa, yaye olunye usukelo kukusebenza njengesilumkiso.
Ingcaciso: Isitshixo sevalve sisetyenziswa ikakhulu ukutshixa ivalve ukukhusela ukhuseleko lwevalve.
Iivalvu: izitshixo zevalve yebhola, izitshixo zevalve yebhabhathane, izitshixo zevalve yesango, izitshixo zevalve ezijikelezayo, izitshixo zevalve ezahlukeneyo ezisebenzayo, njl.