Compressed Air Glossary of Terms
[INDEX]
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
[ADD]
R
- Radial compressor
- A compressor belonging to the group of dynamic compressors.
Characterized by radial flow. (Centrifugal) (010)
- Ram
- The amount of pressure build up above ambient pressure at the engine's compressor inlet, due to
forward motion of the engine through the air - air's initial momentum. (0301)
- Rebound
- The extension of an air actuator beyond its design height.
(099)
- Receivers
- Tanks used for the storage of air discharged from compressors.
They serve also to damp discharge line pulsations.
(060)
- Reciprocating
compressors
- Machines in which the compressing element is a piston having a
reciprocating motion in a cylinder. (060)
- Recovery pressure
- 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. (030)
- Reduced pressure
- Ratio of the pressure of a gas to its critical pressure, in
like units. (060)
- Reduced temperature
- Is the ratio in absolute units of the actual gas temperature
to the critical temperature. (030)
- Refrigerant
- Media of heat transfer in a refrigeration unit. R12 and R22
are commonly used refrigerants. (082)
- Refrigeration dryer
- 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.
(099)
- Regeneration
- 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
is reached. (099)
- Regulator
- An automatic or manual device designed to control pressure,
flow or temperature. (099)
- Reheaters
- Heat exchangers for raising the temperature of compressed air
to increase its volume. (060)
- Relative clearance
volume
- The ratio of clearance volume to the volume swept by the
compressing element. (010)
- Relative humidity
- The ratio of the actual water-vapor partial pressure to its
saturation pressure at the same temperature. (considered only with
atmospheric air). (010)
- Relative vapor
pressure
- The ratio of the vapor pressure to the saturated vapor
pressure at the temperature considered. (011)
- Relief valve
- 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.
(557)
- Required capacity
- Cubic feet per minute (cfm) of air required at the inlet to
the distribution system. (556)
- Reversible process
- 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. (755)
- Reynold's number
- 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
units. (060)
- Rings
- circular metallic elements that ride in the grooves of a
piston and provide compression sealing during combustion. Also used to spread oil for
lubrication.(0104)
- Ring sticking
- freezing of a piston ring in its groove in a piston engine
or reciprocating compressor due to heavy deposits in the piston ring
zone.(0104)
- Rock drill
- A pneumatic percussive drill designed as a boring tool.
(099)
- ROI
- Return on investment (099)
- Rolling element
- A type of journal bearing in centrifugal air compressors.
(020)
- Rotary actuator
- A pneumatic device with a rotary output. Typically of a vane
or rack-and-pinion construction. (480)
- Rotary blowers
- A compressor belonging to the group of displacement rotary
compressors, a type of valve less displacement machine. Also referred to as "Roots blower". (099)
- Rotary compressors
- Machines in which compression is effected by the positive
action of rotating elements. (060)
- Rotary
sliding vane compressors
- Machines in which axial vanes slide radially in an
eccentrically mounted rotor. (060)
- 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.
(060)
- 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.(0104)
Comments?
If you found this interesting, please
send us your
comments.
If we missed some important entry, please use this form to submit
it. Proper
credit
will be given for original and unique entries.
By submitting an entry you give up any copyright or other claim
to it.
-
-
-
© Copyright 1997 - 2003 by Compressed Air Management Impact RM
Inc.
All rights reserved. You are encouraged to make links to this
file.
-
For more information please contact us.
Impact RM |
Comments: |Last updated Friday, 7-February-2003