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Relief valve (4) is installed inside case (1) and operates to protect the KCCV ventilator and engine when
filter (2) is blocked.
CDR valve
(ENG95-A18A-041-K-00-A)
a CDR: Abbreviation for Crankcase Depression Regulator
1. Diaphragm
2. Spring
A: Crankcase side
B: Variable flow turbocharger side (intake side)
The CDR valve is a regulator valve which prevents excessive negative crankcase pressure (P1).
Normally, diaphragm (1) is pushed up by spring (2) and blowby gas flows from crankcase side (A) to
variable flow turbocharger side (intake side) (B).
When intake air flow at the variable flow turbocharger side (intake side) (B) increases and crankcase
pressure (P1) decreases, force of spring (2) yields to ambient pressure (P2). The diaphragm shuts the
passage and temporarily blocks the flow.
Then, when blowby gas accumulates in the crankcase and pressure (P1) recovers, the diaphragm is
pushed up again and blowby gas starts to flow again.
PC88MR-10
10 Structure and function
KCCV ventilator
10-21
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