CONDENSATION—The change from a
gaseous (or vapor) state to a liquid state.
CONTAMINANT—Detrimental matter in a
fluid.
CONTINUITY EQUATION—The mass rate
of fluid flow into any fixed space is equal to the
mass flow rate out. Hence, the mass flow rate of
fluid past all cross sections of a conduit is equal.
CONTROL—A device used to regulate the
function of a component or system.
CONTROL, CYLINDER—A control in
which a fluid cylinder is the actuating device.
CONTROL, ELECTRIC—A control actuated
electrically.
CONTROL, HYDRAULIC—A control
actuated by a liquid.
CONTROL, MANUAL—A control actuated
by the operator.
CONTROL, MECHANICAL—A control
actuated by linkages, gears, screws, cams, or other
mechanical elements.
CONTROL, PNEUMATIC—A control
actuated by air or other gas pressure.
CONTROL, SERVO—A control actuated by
a feedback system that compares the output with
the reference signal and makes corrections to
reduce the difference.
CONTROLS, PUMP—Controls applied to
positive-displacement variable delivery pumps to
adjust their volumetric output or direction of
flow.
CONVERGENT—That which inclines and
approaches nearer together, as the inner walls of
a tube that is constricted.
COOLER—A heat exchanger, which removes
heat from a fluid.
COOLER, AFTERCOOLER—A device that
cools a gas after it has been compressed.
COOLER, INTERCOOLER—A device that
cools a gas between the compressive steps of a
multiple stage compressor.
COOLER, PRECOOLER—A device that
cools a gas before it is compressed.
CORROSION—The slow destruction of
materials by chemical agents and electromechanical
reactions.
CYCLE—A single complete operation
consisting of progressive phases starting and
ending at the neutral position.
CYLINDER—A device that converts fluid
power into linear mechanical force and motion.
It usually consists of a movable element, such as
a piston and piston rod, plunger, or ram,
operating within a cylindrical bore.
CYLINDER, CUSHIONED—A cylinder with
a piston-assembly deceleration device at one of
both ends of the stroke.
CYLINDER,
DOUBLE-ACTING—A
cylinder in which fluid force can be applied to the
movable element in either direction.
CYLINDER, DOUBLE-ROD—A cylinder
with a single piston and a piston rod extending
from each end.
CYLINDER, DUAL-STROKE—A cylinder
combination that provides two working strokes.
CYLINDER, PISTON—A cylinder in which
the movable element has a greater cross-sectional
area than the piston rod.
CYLINDER, PLUNGER—A cylinder in
which the movable element has the same cross-
sectional area as the piston rod.
CYLINDER, SINGLE-ACTING—A cylinder
in which the fluid force can be applied to the
movable element in only one direction.
CYLINDER, SINGLE-ROD—A cylinder
with a piston rod extending from one end.
CYLINDER, SPRING-RETURN—A cylin-
der in which a spring returns the piston assembly.
CYLINDER, TANDEM—Two or more
cylinders with interconnected piston assemblies.
CYLINDER, TELESCOPING—A cylinder
with nested multiple tubular rod segments which
provide a long working stroke in a short retracted
envelope.
AI-2
