» About Us
» Products, Processes and Services
» Glossary » Q, R
Quadratic - Another name for
second order, based on the form of the equation which represents the second
Quick Disconnect - A coupling usually containing at least one check
valve which can be rapidly disconnected with minimal leakage.
Rabbet Mount - A mounting
configuration which utilizes matching male and female forms (usually coaxial
circular) between the cylinder and its mating mounting element.
Ram - A single-acting cylinder in which the movable element has
approximately the same cross-sectional area as the cylinder bore. Hence, a
ram has a single diameter type plunger as opposed to a piston and rod. The
plunger in a ram-type cylinder is also called a ram.
Ramp Input Function - An inclined slope, a constantly increasing
function, a linear intensification of magnitude.
Ratchetting - A stick-slip action (intermittent motion) of the
Rated - Refers to the manufacturers designation of the normal
operating condition the maximum, allowable, continuous, etc.
Ratio of Specific Heats - The ratio of the amount of heat required
to raise a mass of material 1 degree in temperature to the amount of heat
required to raise an equal mass of a reference substance 1 degree in
Reciprocation - A back-and-forth straight line motion or
Redundancy - The existence of more than one means for accomplishing
a given function.
Regeneration - The recovery of energy that would ordinarily be lost.
Regenerative Control System - A system where part or all of the
output is fed back to help drive the function or is stored for driving the
Reproducibility - Quantitative expression of the random error,
associated with testers working in different laboratories, each obtaining
single results on identical test material, using same method. That is, the
precision with which the measurement of a given quantity can be duplicated
in separate facilities.
Response Time - The time required for the system output to reach and
stay within a specified percentage of its theoretical final value due to a
step input usually equal to five time constants.
Restrictor - A device having a reduced fixed or variable area which
creates a deliberate pressure drop and resistance to the normal flow of
fluid. Variable types are noncompensated, pressure-compensated, or pressure-
Reynolds Number - The dimensionless ratio of dynamic force due to
mass flow to the shear stress due to viscosity.
Remote Power Skid - Some press applications may require that the
hydraulics be located remotely from the press itself. Other applications may
preclude the power system from being able to be installed at the top around
the crown structure of the press. In these cases, the power system and even
the controls may be designed into a separate unit capable of being placed
adjacent to the press or away from the press.