Operation
5562−1/A1
Winterthur Gas & Diesel Ltd.
1/ 2
Pressure Control Valve
1. General
1.1 Operation
The engine software controls the fuel pressure. The pressure in the fuel rail is always
less than that necessary to open the pressure control valve (PCV).
The PCV (1, Fig. 1) is usually closed.
The PCV can also operate as a pressure relief valve and will open if the fuel pressure
is more than the specified pressure of approximately 1050 bar.
For more data, see 4002-1, paragraph 3.7 Diesel Fuel Pressure Control).
WCH02237
DRIVING END
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3
2
4
4
7
8 1 2
6
5
WCH02237
Fig. 1: Location of Pressure Control Valve
1 Pressure control valve 10-5562_E0_5 5 Drain pipe
2 Control valve (ZV7061S) 6 Valve block
3 Rail unit 7 Fuel return pipe
4 Fuel rail 8 Relief valve
1.2 Emergency Stop
The safety system operates the control valve (2), which decreases the fuel pressure
to less than 200 bar (usually to 0 bar). Thus, fuel injection is not possible.
The PCV is one of three devices that can shut down the engine. The other devices
are:
D Immediate injection stop (engine software)
D Fuel pump supply moved to 0 (engine software).
2014
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