Assertion: valve's surface | /r/CapableOf | permit hydrostatic pressure
Facets:
Source sentences:
text: The valve seat member 16, in one preferred embodiment, may be a teflon valve seat designed to accommodate the valve member 15, either of spherical ball shape or of conical shape, with the opening 16a in the valve seat sized so that when the valve is activated and the urine begins to flow, the increased surface of the exposed valve member should permit hydrostatic pressure to assist in keeping the valve open.