A na-akpọkarị valvụ bọọlụ mepere emepe na nke dị nso, mana ị maara n'ezie?Ọ nwere mmetụta nke ịtụgharị ogo 90.Ahụ plọg bụ okirikiri nwere oghere okirikiri ma ọ bụ ọwa site na axis ya.Na mba anyị, bọọlụ valvụ na-ọtụtụ ebe na-eji mmanụ refining, ogologo anya pipeline, chemical ụlọ ọrụ, p ...
GỤKWUO