from The Century Dictionary.
- noun A valve closed by a tapering plug at right angles to the flow of the liquid.
Sorry, no etymologies found.
Two methods were proposed to remedy this inconvenience, which amounts to a perfect use - lessness of more than i - of our power. 1st, to place a large plug-valve E, Fig. 9, in the rising pipe close to the pump, having as much water-way through its seat at a very small rise, as the whole pipe.