This oil outlet passage feeds oil from the outlet of the orifice to a space defined under the bottom of the valve housing.
石油出口通道，这饲料从口出口石油根据阀门的房屋底部定义的空间。
2
Need to check the oil box's bottom which outlet whether closed or not, after closed surely then open the top of oil box and add the sealing cover for the top orifice.