The following terms define Building and Machine Parts
valley: V shaped depression at intersection of two sloping roofs.
valley jacks: rafters that extend from ridgepole to valley rafter.
valley rafter: diagonal rafter that extends from ridgepole to top plate to form intersection of two sloping roofs.
valve: device that regulates flow of liquid or gas.
vane: flattened, curved piece on revolving wheel.
vapor barrier: section of material that resists passage of water vapor.
vent: opening, especially in wall serving as outlet for air, smoke, or fumes.
vent stack: top section of soil stack that extends out through roof.
volute spring: conical coil spring extending in direction of axis of coil.