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DD15 Quantity Control Valve Overview by Tamer Moustafa is a document available to read on EtoBox.

The document describes the quantity control valve (Y642) located on the fuel high pressure pump of engine models 963. It regulates fuel feed and rail pressure, and discontinues fuel supply for engine stop. It consists of a fuel pump housing, coil, float needle, and valve spring. The engine management control unit uses pulse width modulation to actuate the coil and influence the float needle position, controlling fuel flow rate through the valve. At engine stop, the spring pushes the needle back to interrupt

Author

Tamer Moustafa

Language

EN