The height of a column or body of fluid above a given point
expressed in linear units. Head is often used to indicate gauge
pressure. Pressure is equal to the height times the density of the
The form of energy that has the capacity to create warmth or
to increase the temperature of a substance. Any energy that is wasted
or used to overcome friction is converted to heat. Heat is measured
in calories or British Thermal Units (BTUs). One BTU
is the amount of heat required to raise the temperature of one pound
of water one degree Fahrenheit.
Exchanger: A device which transfers heat through a conducting
wall from one fluid to another.
power required to lift 550 pounds one foot in one second or 33,000
pounds one foot in minute. A horsepower is equal to 746 watts or
to 42.4 British Thermal Unit per minute.
Torque: Sometimes called static torque, it is specifies the
maximum external force or torque or torque that can be applied to
a stopped, energized motor without causing the rotor to rotate continuously.
A reference position in a motion control system derived from
a mechanical datum or switch. Often designated as the "zero"
Balance: A condition of equal opposed hydraulic forces acting
within a hydraulic component.
Engineering science pertaining to the energy of liquid flow
Engineering science pertaining to the energy of confined fluid.
Servo: A brushless servo motor based on a conventional hybrid
stepper. It may use either a resolver or encoder for commutation
The differences in response of a system to an increasing or
a decreasing input signal.