Assertion: valve's seat | /r/HasAspect | dished out portion
Facets:
Source sentences:
text: The circular seat required the valve casing to have a dished out portion or well along the bottom of the through-bore to receive the lower portion of the gate member, and thus, when the valve gate member was opened, eddy currents were set up therein, this resulting in lime deposits and dirt and sludge deposits settling in the dished out bottom or well.