Assertion: conduit's wall | /r/HasProperty | a flapper valve
Facets:
Source sentences:
text: For example, inner wall 42 may include a valve member 60 (shown schematically, e.g., a flapper valve or other suitable arrangement) which allows air flow from central passage 44 to sealed compartment 52 but prevents flow from sealed compartment 52 to central passage 44 may be utilized.
text: For example, inner wall 142 may include a valve member 160 (shown schematically in dashed line, e.g., a flapper valve or other suitable arrangement) which allows air flow from central passage 144 into sealed compartment 152 but prevents flow from sealed compartment 152 to central passage 144 may be utilized.