Renault Laguna III Manual page 1205

Oil vapour rebreathing circuit: Operating diagram
K9K
A: Low load
B: Medium and high load
(1) Cylinder head cover
(2) Oil vapour breather pipe
(3) Oil vapour rebreathing valve
(4) Air inlet duct
(5) Turbocharger
(6) Atmospheric pressure
ANTIPOLLUTION
20965
20965-1
14A-4
A: At low load, the vacuum pressure prevailing in the
air inlet duct is below the spring calibration. Large
quantities of oil vapour are sucked back in by the vacu-
um prevailing in the air inlet duct.
B: At medium or high load, the vacuum pressure pre-
vailing in the air inlet duct pulls the valve diaphragm
and small quantities of oil vapour are rebreathed in via
a calibrated opening.
14A