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Gain Margin - The amount of
control loop gain in decibels that can be increased before the system
Galling - An adhesion condition which arises from a combination of
materials which possess either poor bearing characteristics or are operated
with improper or no lubrication. This wear mechanism results in the transfer
of material from one member to the other member in such a manner as to cause
extremely high force to move the members relative to each other. Galling can
result in both members virtually locked together.
Gauge Pressure - Pressure of a system over and above atmospheric
pressure. The difference between absolute pressure and atmospheric pressure.
It is the pressure used to calculate the forces exerted in a hydraulic
Generated Contaminant - It is contaminant produced due to the
deterioration of surfaces, various tribological wear mechanisms,
incompatible materials, etc. A product of system activity and inactivity.
Gland - The cavity of a stuffing box.
Heat Exchanger - A device
attached to the oil reservoir to circulate water or air to keep oil at
proper operating temperature.
Heated Platens - These are plates that have heating capabilities.
They can be heated using electric rods, steam, oil, water or other medium.
These system usually require thermal breaks between theheated plates and the
hydraulic press structure. Heating controls can be separate or fully
integrated into the press control system.
H-Frame Hydraulic Press - Commonly known as a 4 column hydraulic
press, an H-Frame hydraulic press has a construction style that resembles
the letter H. An H-frame hydraulic press can typically field multiple press
applications simultaneously. TMP manufactures a complete H-frame hydraulic
press line from 3-200 tons, serving the rubber, plastics, composite, and
printed circuit board markets.
Horsepower - A standard unit of power or work. One Hp is equal to
550 ft lb. of energy or work done per second, 33,000 ft lb. of work per
minute, 0.746 KW, or 42.4 BTU per minute.
Hydraulic Balance - A condition of equal opposed hydraulic forces
acting on an element in a hydraulic component. That is, a condition in which
opposing hydraulic forces are equal.
Hydraulic Detent - A valve configuration which applies the open
actuator port pressure against an axial control surface of the spool to hold
the valve spool position until a greater axial force is applied to shift the
valve in the opposite direction.
Hydraulic Fuse - A hydraulic fuse is designed to provide excess flow
protection. It automatically shuts off any line in which failure (component
rupture or fracture) has occurred and where hydraulic fluid spews out of a
system. It is analogous to an electrical safety device called a "fuse"
in which a strip of metal melts and interrupts the circuit when the current
exceeds a particular amperage. These devices consist of various types of
excess-flow valves. Such devices are used to block flow and not to relieve
pressure as performed by a hydraulic system protector.
Hydrokinetics - The engineering science pertaining to the forces
produced by a liquid as a result of its motion. For example a centrifugal
Hydrolytic Stability - The resistance to permanent changes in
properties caused by chemical reaction with water.