China v3 waste gas valve is the upper air intake or the lower air intake?

China v3 waste gas valve is the upper air intake or the lower air intake: the waste gas valve exhausts in the throttle direction of the intake pipe. I took it out and confirmed it. Waste valve is only used for exhaust! Oil drainage indicates that the check valve is damaged. Tb buy one and install it (big head facing the engine and small head facing the intake pipe). My generation 1.5T has been changed like this for half a year now, and the oil will not be abnormally lost again.