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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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| Valve |
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A device which controls fluid flow direction, pressure, or flow rate.
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| Variable relief |
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Specific rows of pellet die holes, such as the two inner and outside rows that are counterbored to greater depths at their outlets. Acts to encourage feed flow through these holes.
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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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