Construction; Operation - Denso 4D56 Service Manual

Operation Section
1 18
–

7.4 Construction

QR Codes
Control Chamber
Command Piston
Nozzle Spring
Pressure Pin
Nozzle Needle

7.5 Operation

The TWV (Two-Way Valve) solenoid valve opens and closes the outlet orifice to control both the pressure in the control chamber, and
the start and end of injection.
(1) Non injection
• When no current is supplied to the solenoid, the spring force is stronger than the hydraulic pressure in the control chamber. Thus, the
30 Alphanumeric Figures
Pressurized Fuel
(from Rail)
Multiple Hole Filter
Seat
Pressurized Fuel
Leak Passage
Q001240E