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T692-94船用(yong)油(you)(you)(you)艙(cang)呼吸(xi)閥由壓(ya)(ya)(ya)力閥和真空閥組(zu)成，安裝于貨油(you)(you)(you)艙(cang)透氣管上，能(neng)(neng)隨貨油(you)(you)(you)艙(cang)內(nei)油(you)(you)(you)氣正負壓(ya)(ya)(ya)變化而(er)自動啟(qi)閉，使貨油(you)(you)(you)艙(cang)內(nei)外氣壓(ya)(ya)(ya)差(cha)保持(chi)在允許值范圍內(nei)的(de)閥。作用(yong)：它(ta)充分利(li)用(yong)油(you)(you)(you)罐本(ben)身的(de)承壓(ya)(ya)(ya)能(neng)(neng)力來(lai)減(jian)少油(you)(you)(you)蒸氣排放(fang)，其(qi)原理是(shi)利(li)用(yong)閥盤的(de)重量來(lai)控(kong)制油(you)(you)(you)罐的(de)呼氣正壓(ya)(ya)(ya)和吸(xi)氣負壓(ya)(ya)(ya)。