Cylinder - Cylinder assembly
consists of a cylinder, piston, ram, packing, and seals. Piston diameter and
oil pressure determine the force (tonnage) that a given press can deliver.
Closed Circuit - A conduit arrangement in which the pump delivery,
after passing through the hydraulic actuator, by-passes the reservoir and
returns directly to the pump inlet. Closed circuit configuration is commonly
used in hydrostatic transmission drive systems. The movement of the actuator
in this type circuit is controlled by a variable displacement pump and not a
valve.
Closed Loop - A group of control elements linked together such that
the output is continually monitored and compared with the input. Should the
output differ from the input, the resulting error signal will cause
corrective action in the system.
C-Frame Hydraulic Press - A C-Frame hydraulic press, also known as a
c-style hydraulic press, or a gap frame hydraulic press has a frame
configuration that resembles a “C." The C-frame hydraulic press is
designed to have a minimal footprint on the shop floor. Other advantages of
C-frame hydraulic press construction include an increased open work area,
which increases accessibility. C-frame hydraulic presses are used to form a
wide range of materials, including rubber, plastics, and composites.
Capillary - A tube which exhibits a length to diameter ratio ³
400. In most cases the tube has an internal diameter in the range of a few
thousandths of an inch, which causes the characteristic elevation or
depression of liquids.
Cartridge Valve - A valve which can be removed and replaced easily
without being fully dismantled. They are completely bodiless and capable of
satisfying directional, flow, and pressure functions.
Cartridge - A component which can be removed and replaced easily
without being fully dismantled — e.g., a replaceable element for a
filter, pump or valve.
Cavitation - A localized vaporous/gaseous condition within a liquid
stream which occurs where the pressure is reduced below atmospheric and the
vapor pressure of the liquid. In pumps it occurs when the suction line is
restricted and the resulting vacuum causes the fluid to boil and the surface
of the fluid wet component to flake and pit.
Contamination Control - An engineering technology involved in
planning, organizing, and implementing all the activities needed to identify
(recognize and describe) contaminant, analyze (characterize and quantify)
contaminant, exclude (restrict, isolate, and reject) contaminant, reduce
(capture, retain, and remove) contaminant, establish the tolerance of
components for contaminant, and ascertain the necessary contaminant balance
(between the level of contamination in the fluid and the level of
contaminant tolerance of the components to yield a given contaminant service
life).
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