Assertion: valve's part | /r/CapableOf | block the flow
Facets:
Source sentences:
text: A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a ball.
text: A swing check valve or tilting disc check valve is a check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow.