A compressor belonging to the group of dynamic compressors.
Characterized by radial flow. (Centrifugal)
The extension of an air actuator beyond its design height.
Tanks used for the storage of air discharged from compressors.
They serve also to damp discharge line pulsations.
Machines in which the compressing element is a piston having a
reciprocating motion in a cylinder.
Is that pressure of either motive fluid or discharge at which
an ejector returns to stable operation following a period of
unstable operation due to having previously reached the breaking
pressure. There are two recovery pressures, one for motive fluid
and one for the discharge pressure.
Ratio of the pressure of a gas to its critical pressure, in
Is the ratio in absolute units of the actual gas temperature
to the critical temperature.
Media of heat transfer in a refrigeration unit. R12 and R22
are commonly used refrigerants.
A device consisting of a heat transfer system, a moisture
elimination system and a refrigeration system designed to improve
the quality of the air and reduce the temperature of the air.
The process of desiccants being regenerated by water being
driven off the desiccant. Hot air or gas passes through the
desiccant bed, heating it. As a result, the partial pressure of
the water vapor becomes higher than that in the regenerating air.
Water is therefore released from the desiccant and carried away
with the air stream (purge air) until a new state of equilibrium
An automatic or manual device designed to control pressure,
flow or temperature.
Heat exchangers for raising the temperature of compressed air
to increase its volume.
The ratio of clearance volume to the volume swept by the
The ratio of the actual water-vapor partial pressure to its
saturation pressure at the same temperature. (considered only with
The ratio of the vapor pressure to the saturated vapor
pressure at the temperature considered.
A spring loaded pressure relief valve actuated by the static
pressure upstream of the valve. The valve opens normally in
proportion to the pressure increase over the opening pressure.
Cubic feet per minute (cfm) of air required at the inlet to
the distribution system.
is an ideal process that may be stopped and made to retrace
its steps and restore to the systems or surroundings all work and
heat previously removed. It is frictionless.
A dimensionless flow parameter, ( Jnr/m), in which J is a
significant dimension, often a diameter, n is the fluid velocity,
r is mass density, and m is dynamic viscosity, all in consistent
Circular metallic elements that ride in the grooves of a
piston and provide compression sealing during combustion. Also used to spread oil for
freezing of a piston ring in its groove in a piston engine
or reciprocating compressor due to heavy deposits in the piston ring
A pneumatic percussive drill designed as a boring tool.
A type of journal bearing in centrifugal air compressors.
A pneumatic device with a rotary output. Typically of a vane
or rack-and-pinion construction.
A compressor belonging to the group of displacement rotary
compressors, a type of valve less displacement machine. Also referred to as "Roots blower".
Machines in which compression is effected by the positive
action of rotating elements.
sliding vane compressors
Machines in which axial vanes slide radially in an
eccentrically mounted rotor.
The rotating element of a machine and, in the case of a
compressor, is composed of the impeller (impellers) and shaft, and
may include shaft sleeves and a thrust balancing device.
Rust prevention test
(turbine oils) -- a test for determining the ability of an
oil to aid in preventing the rusting of ferrous parts in the
presence of water.