Ib daim tshev valve uas nws cov disc txav nce thiab nqis raws axis ntawm lub disc sealing nto.Lift check li qubmuab faib uantsug nqa check valvesthiabncaj nqa check valves. Piv nrog rau lwm cov tshev li qub, nqa daim tshev li qub muaj qhov nqa luv tshaj plaws, yog li nqa daim tshev li qub yog qhov ceev-kaw li qub. Vertical lift check li qub yog ntsia tau rau hauv cov kav dej ntsug, thaum lub tshuab nqa ncaj nraim yog ntsia tau rau hauv cov kav dej kab rov tav.
