Leyon Hluav Taws Ntaus Sib Ntaus Ob Chav Qhov Rooj Hnov Hneev
Nqi ruamGrooved Ob Chav Qhov Rooj Kos Valveyog ib hom check valve (tsis-rov qab valve) nrog grooved sib txuas. Nws yog siv los tso cai rau dej ntws los ntawm nws nyob rau hauv tsuas yog ib qho kev taw qhia, thiab cov clappers qhib kom tso cai rau pem hauv ntej los yog ze los thaiv rov qab ntws.

Sau koj cov lus ntawm no thiab xa mus rau peb