Komatsu PC88MR-10 Shop Manual page 87

Operation
(ENG95-AA10-044-K-00-A)
1. Large scroll
2. Small scroll
3. Fixed vane
4. Flow control valve
A: When flow control valve is fully closed (small flow rate)
B: When flow control valve is fully open (large flow rate)
The turbine housing of the variable flow turbocharger consists of large scroll (1) and small scroll (2).
Fixed vane (3) is installed between large scroll (1) and small scroll (2) for flow rectification.
The flow rate into large scroll (1) side is controlled by opening or closing the flow control valve (4).
The position of the flow control valve (4) is controlled by the actuator which is driven by the command from
the engine controller.
PC88MR-10
10 Structure and function
Variable flow turbocharger
10-9