bac nao co bo symbol (co, te, giam...)+ cac loai valve ( gate valve, motorai valve, balancing valve...) + dong ho ap suat, nhiet do, luu luong...cua he thong chiller ko cho em xin voi. em dang ve thi cong nhung ngoi ve lai may thiet bi do lau qua. cam on cac bac nhieu nha.