Assertion: meter's part | /r/CapableOf | seal against each other
Facets:
value: to prevent leakage
type: PURPOSE
value: effectively
type: MANNER
Source sentences:
text: Positive displacement flow meters rely on moving parts to shuttle quantities of fluid through them, and these moving parts must effectively seal against each other to prevent leakage past the mechanism (which will result in the instrument indicating less fluid passing through than there actually is).