Assertion: valve's surface | /r/CapableOf | define a valve seat
Facets:
Source sentences:
text: A gate valve structure for use in mains carrying a fluid, said gate valve structure comprising: a valve casing having a through-bore with spaced axially aligned ports and a valve chamber intermediate the ports and providing unobstructed communication between the ports, said valve chamber being defined by a curved bottom wall providing a continuation of the bottom of the through-bore, oppositely disposed planar side walls diverging upwardly from said curved bottom wall at a predetermined included angle, and an upper open end generally rectangular in cross-section parallel to the axis of the through-bore, said upper open end being defined by upper portions of said divergent side walls and by divergent oppositely disposed walls extending generally transverse of the through-bore, said bottom wall, divergent side walls and at least one of said transversely extending walls providing a continuous surface defining a valve seat; and a generally flat valve gate member movable through the upper open end of said valve chamber to a closed position blocking