V belt A belt, with a triangular cross-section, for looping round two V-grooved pulley wheels, one on each rotating shaft, to transmit mechanical power from one to the other
vacuum furnace A chamber for achieving extremely high temperatures, for treating objects in the absence of air
vacuum pump A device for evacuating the air from a vessel or pipe
vacuum switch An electrical switch that makes and breaks its contacts at a preset threshold partial vacuum
valve actuator A device that achieves mechanical displacement, under some sort of remote control, to open or close a valve in a pipe or container
vane pump A pump that uses two or more vanes on a spinning wheel to generate flow. The vanes are spring loaded, so that they can expand and contract and remain in constant contact with the sides of an eccentric chamber
vertical lathe A machine for turning (using tools, like chisels, to cut into the object while it is being held upright, and turned about its central vertical axis)