Assertion: valve's surface | /r/HasProperty | provided
Facets:
value: for wiping this surface
type: PURPOSE
Source sentences:
text: The first valve stem has a smooth exterior surface which slidably receives the gate valve member and means are provided for wiping this surface clean, as well as for sealing this surface with the gate valve member at all positions of movement of the same, whereby the threads of the first valve stem and the second valve stem are projected from line fluid at alltimes.