Assertion: valve | /r/CapableOf | expose effective surface
Facets:
value: to leftwardly acting pressure
type: TRANSITIVE-OBJECT
Source sentences:
text: Thus, when the rod 37 is urged in one axial direction, as in the leftward direction (Figure 3), until the valve 32 is closed, the valve 32 remains closed because the valve 28 exposes an effective surface to leftwardly acting pressure and the opposite side of the hub of diaphragm 66 is protected from the action of the pressure fluid by the presence of the rod 43a which is of a diameter larger than the diameter of the rod 37.