- Sl/ tieu thl) khong khf
E. VAN TIET LUU
Van tifft /uu c6 nhi~m vv diJu chlnh dong chay, tuc la diJu chlnh v~n t6c hoijc thai gian ch?y cua CCI ciu chip hanh. Nguyen ly lam vi~c cua van titt luu la /Liu luqng dong chay qua van phv thu{)c vao sl/ thay c16i titt di~n.
Van c6 tac dvng diJu chlnh, titt luu dong khf di qua, tac d{)ng tren ca hai chiJu di chuy€n cua dong khf
• Van tiet /Liu c6 m;Jt cat khong d6i
Van tiet /Liu bJng m~t cfit:CJ van nay c6 do dai cua SI/ tiet /Liu cao hem duang kfnh tiet /Liu
Van c6 mang ngan:CJ van nay c6 do dai cua SI/ tiet /Liu ngan hem duang kf nh tiet luu
• Van tiet /Liu c6 ch6 co h~p thay d6i
Van tiet /Liu co m~t cfit di€u chlnh duqc
EJ
EE
Van tiet /Liu bJng m~t cfit (dong chay) duqc di€u khi€n bJng ca khi c6 mot phan h6i bJng lo xo
Van nay th~n dLJng khi /Jp van tiet /Liu bJng m~t cfit trljc tiep Jen xy lanh
7. Van tiet /Liu m9t chi€u
Van nay thuang duqc su dLJng d€ di€u chlnh toe dQ cua nhung xy lanh khf nen. Van tiet /Liu m9t chi€u c6 th€ /Jp trljc tiep fen xy lanh khf nen. Nguai ta phan bi~t thanh hai ki€u chfnh de di€u chlnh xy lanh tac dLJng m9t phfa bCJi sl/ giam /Liu luqng khf.
Theo chi€u dong cua van mot chi€u, dong khf chl c6 th€ di qua ti<ft di~n tiet luu. Theo chi€u nguqc li;1i, dong khf c6 the di chuy€n ti/ do qua van mot chi€u. Nhu V?Y dong khf chl bi tiet luu CJ mot chi€u cua dong chay.
p A
- Tiet /Liu duang cung cap (tiet luu sa cap)
Trang truang hqp tiet luu duang cung cap (duang vao), van tiet /Liu mot chi€u duqc /Jp CJ duang vao va hi;J.n che Juqng khf cung cap cho xy lanh. Trang khi d6 khi c6 th€ thoat ra tu xy lanh mot each ti/ do nha van mot chi€u. Tiet luu duang cung cffp duqc su dLJng CJ trang cac xy lanh tac dong dan va th€ tfch nho
Nguqc lcJi, trong truang hqp ti6t luu ductng ra, khf nen cung c§p ti/ do cho xy lanh va bi ti6t /uu (J duang ra. Thong thuang trong h~ th6ng khf nen, dt! di§u chlnh t6c d{) ciia ca c§u chip hanh nguai ta sit dvng phuang phap ti6t /uu dtictng ra
2. Van ti6t /uu hai chi§u
Van ti6t /uu hai chi§u thl/c hi?n vi?c ti6t luu ca hai chiJu, dong khf nen di tu P
qua A va nguqc lcJi. Ti6t di?n thay ddi bai vft diJu chlnh.