Patent ID: 9624878
Date: 2017-04-18
CPC Classifications: F02M,F16K

Claim:
1. A non-return valve device for an internal combustion engine, the non-return valve device comprising: a duct housing comprising defining inner walls; a valve housing arranged in the duct housing comprising at least one aperture comprising a downstream end, the at least one aperture being configured to define a flow cross section; at least one valve seat configured to surround the flow cross section; and at least one valve closing member configured to adapt, close or open the flow cross section, the at least one valve closing member being configured as leaf springs configured to have a maximum opened position, wherein, the duct housing is configured to extend across an overall width of the valve housing in an outer region relative to the valve housing immediately in front of the downstream end of the at least one aperture, a first distance between each of the leaf springs in their maximum opened position at the downstream end of the at least one aperture and the duct housing arranged opposite to each of the leaf springs has a maximum which is twice as large as a second distance, the maximum opening width, between each of the leaf springs in their maximum opened position at the downstream end and the at least one valve seat arranged opposite to each of the leaf springs, and the defining inner walls of the duct housing downstream of the valve housing are arranged relative to each other so that, in a flow direction, the flow cross section is first continuously reduced to a reduced portion and then continuously enlarged.