Vacuum Pumps
|
Compressors
that operate with an intake pressure below atmospheric and discharge
pressure usually atmospheric or slightly higher. |
Valves
|
Devices with
passages for directing flow into alternate paths or to prevent flow.
|
| Vane Compressor |
A single
shaft, positive displacement rotary compressor. |
Vane Material
|
The most common
is phenolic resin-impregnated laminated fabrics, such as asbestos or cotton
cloth. For oil free service, bronze and carbon/graphite vanes are used. |
Vapor
|
A substance in the
gaseous state and is typically fine separated particles floating in the air and
appear as a cloud. |
| Vaporization |
The process
of changing from a liquid to a gaseous state. |
Vapor Pressure
|
The pressure exerted by a vapor confined within a given space
and may be the sole occupant of the space, or may be associated with other
gases. |
Varnish
|
The oxidation of conventional hydrocarbon lubricants when they reach the end
of their useful life and begin to breakdown; thereby, can cause operating temperature
increase, increase brake horsepower, plugs the separator, and can destroy
the air end. |
| V-Belt Drive |
A drive arrangement providing power transmission to compressors. |
Vent Loss
|
The gaseous
product lost on relief of high liquid product storage pressure either
through an automatic relief valve or manual vent valve. |
Venturi
|
A tube with a narrow throat (constriction) that increases the velocity and
lowers the pressure of the liquid passing through it creating a partial
vacuum immediately after the constriction in the tube. The vacuum created by
the venturi
has a sucking effect and is commonly used to introduce a liquid (regenerant) or gas (air)
into a flowing water stream. |
Viscosity
|
A measure of resistance to deformation or reluctance to be squeezed out
a bearing; alos indicates the internal friction of a fluid. Viscosity in
normal lubricants is reduced as temperature increases. |
Viscosity Index (VI)
|
A
measure of the rate of change of viscosity with temperature. Oils with high
VI have low viscosity changes. |
Volumetric Efficiency
|
The ratio and percent of the actual delivered capacity (measured at the inlet
-
temperature, pressure, and gas composition) to the piston displacement. |
Volute
|
A stationary,
spirally shaped passage that converts velocity head to pressure in a flowing
stream of air or gas. |
Voting Alarm
|
With Compressors/Gas Turbines,
it is an alarm system that generally employs 3 interconnected sensors
into a central controller with set parameters and it will typically require
a minimum of 2 of the 3 sensors to energize before
the alarm will react. |
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