U-ngalaba urukurubụba valvụ bụ Bidirectional sealing, magburu onwe arụmọrụ, obere torque uru, enwere ike iji na njedebe nke ọkpọkọ maka valvụ efu, a pụrụ ịdabere na ya ịrụ ọrụ, oche akara mgbanaka na valvụ ahụ organically jikọtara n'ime otu, nke mere na valvụ nwere ogologo. ndụ ọrụ