The IMV is an Inlet Metering Valve.
The DRV is a pressure regulating valve.
Both of these control the rail pressure in their own way.
The 3rd piston valve is a control system that allows one of the three pistons in a Bosch CP1 pump to "free wheel" and can be used in cruise conditions. It does not control nor affect the rail pressure. HTH
Regards Mark
Modern cars, Its all wizardry and witchcraft
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