Patent ID: 9534564
Date: 2017-01-03
CPC Classifications: F02D,F02M,F23G,F23K,F23N,Y02T

Claim:
1. A system for controlling a flow of vent gases to a combustion engine, the system comprising: an inlet for receiving the vent gases; a pressure relief device that enables the vent gases to escape to atmosphere when a pressure in the inlet exceeds a predetermined relief pressure; a flow-restricting orifice; a back pressure regulator disposed downstream of the orifice for regulating a maximum pressure in a duct between the orifice and the back pressure regulator; a front pressure regulator set at a front pressure setting and disposed upstream of the back pressure regulator that is set at a back pressure setting that is lower than the front pressure setting; and a shut-off valve disposed between the back pressure regulator and an air intake duct of the engine, the valve being set to only open when an intake duct pressure falls below a predetermined pressure.