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| Vacuum |
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Pressure less than atmospheric pressure. It is usually expresses in inches of mercury (in Hg) as referred to the existing atmospheric pressure.
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| Values |
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The valuable minerals contained in a deposit, usually refers to the precious metal content.
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| Valve |
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A device which controls fluid flow direction, pressure, or flow rate.
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| Vein |
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A mineralized area having a more or less regular development in length, width and depth. It is clearly separated from neighboring rock.
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| Velocity |
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The speed of flow through a hydraulic line. Expressed in feet per second (fps) or inches per second (ips).
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| Vent |
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To permit opening of a pressure control valve by opening its pilot port (vent connection) to atmospheric pressure.
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| Viscosity |
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A measure of the internal friction or the resistance of a fluid to flow.
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| Viscosity index |
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A measure of the viscosity-temperature characteristics of a fluid as referred to that of two arbitrary reference fluids.
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