Rubber hydraulic hose and ... - Flipbook - Seite 337
compound: the mixture of rubber
or plastic and other materials,
which are combined to give the
desired properties when used in the
manufacture of a product.
compression fitting: see
fitting/coupling – compression
conductive: the ability to transfer
electrical potential.
configuration: the combination of
fittings on a particular assembly.
convoluted: description of hose or
innercore having annular or helical
ridges formed to enhance flexibility.
core: the inner portion of a hose,
usually referring to the material in
contact with the medium.
corrosion: the process of material
degradation by chemical or
electrochemical means.
corrosion resistance: ability
of metal components to resist
oxidation.
corrugated hose: hose with a
carcass fluted, radially or helically,
to enhance its flexibility or reduce
its weight.
coupling: a frequently used
alternative term for hose end fitting.
cover: the outer component usually
intended to protect the carcass of
a product.
CPE: chlorinated polyethylene, a
rubber elastomer.
cracking: a sharp break or fissure
in the surface, generally caused
by strain and environmental
conditions.
crimp diameter: the distance
across opposite flats after crimping.
crimp/crimping: a hose end
fitting attachment method utilizing
a number of dies mounted in a
radial configuration. The dies close
perpendicular to the hose and
fitting axis, compressing the collar,
ferrule, or sleeve around the hose.
cure: the act of vulcanization. See
vulcanization.
cut off factor: the hose length
to be subtracted from the overall
assembly length that allows for
the hose coupling end connection
extension beyond the end of the
hose.
D
date code: any combination of
numbers, letters, symbols or other
methods used by a manufacturer to
identify the time of manufacture of
a product.
deburr: to remove ragged edges
from the inside diameter of a hose
end.
design factor: a ratio used to
establish the working pressure
of the hose, based on the burst
strength of the hose.
displacement: the amount of
motion applied to a hose defined
as inches for parallel offset and
degrees for angular misalignment.
DOT: Department of Transportation.
DIN: Deutsche Industrie Norme.
duplex assembly: an assembly
consisting of two hose assemblie,
one inside the other, and connected
at the ends; also known as “jacketed
assemblies.”
durometer: an instrument for
measuring the hardness of rubber
and plastic compounds.
E
eccentricity: the condition
resulting from the inside and
outside diameters not having a
common center.
effusion: the escape, usually of
gases, through a material. See
permeation.
elastic limit: the limiting extent
to which a body may be deformed
and yet return to its original shape
after removal of the deforming
force.
elastomer: any one of a group
of polymeric materials, usually
designated thermoset, such as
natural rubber, or thermoplastic,
which will soften with application
of heat.
elongation: the increase in
length expressed numerically as a
percentage of the initial length.
EN: European Normes
ERMETO: a steel fitting product
trademarked by Danfoss
Corporation.
endurance test: a service or
laboratory test, conducted to
product failure, usually under
normal use conditions.
EPDM: Ethylene Propylene Diene
Monomer; an elastomer.
extrude/extruded/extrusion:
forced through the shaping die of
an extruder; extrusion may have a
solid or hollow cross section.
F
fabric impression: impression
formed on the rubber surface
during vulcanization by contact
with fabric jacket or wrapper.
fabricator: the producer of hose
assemblies.
fatigue: the weakening or
deterioration of a material occurring
when a repetitious or continuous
application of stress causes strain,
which could lead to failure.
FDA: United States Food and Drug
Administration.
fire sleeve: slip-on or integrally
extruded sleeve used to retard the
effects of fire in certain applications;
most often made with silicone and/
or ceramic fiber.
fitting/coupling: a device
attached to the end of the hose to
facilitate connection. The following
is only a partial list of types of
fittings available.
• banjo fitting: a through bolted
designed featuring a hollow circle
or “donut” attached to one end of
the fitting barb so that the inner
diameter is along the hose axis.
• compression fitting: a fitting
style that seals on a mating tube
by compressing an internal ferrule
against the tube O.D.
• field attachable fitting: a fitting
designed to be attached to hose
without crimping or swaging. This
fitting is not always a reusable
type fitting.
• flange style fittings: pipe
flanges and flanged fitting
standards are listed under ANSI
B16.5. Flanges are rated for
pressure and listed as “American
Class 150, 300, 400, 600, 900, 1,500
or 2,500.” Pressure-temperature
ratings can be obtained by
consulting the ANSI specification
or ASME B16.5 (American Society
of Mechanical Engineers). Designs
vary by neck and face style, or
other dimensional changes based
on use. Various finishes or grooves
may be applied to the face for
sealing on a gasket or o-ring. Bolt
holes and other dimensions are
per the ANSI standard.
• inverted flare fitting: a fitting
consisting of a male or female nut,
trapped on a tube by flaring the
end of the tube material to either
37° or 45°.
• JIC fittings: Joint Industrial
Council (no longer in existence).
An engineering group that
established an industry standard
fitting design incorporating a 37°
mating surface, male and female
styles. These standards are now
governed by SAE.
• o-ring fittings: a fitting that seals
by means of an elastomeric ring of
a specified material.
pipe thread fittings:
• NPT: National Pipe Taper. Pipe
thread per ANSI B1.20.1
• NPTF: National Pipe Tapered for
Fuels. (Same as above except dryseal per ANSI B1.20.3)
• NPSH: National Pipe Straight Hose
per ANSI B1.20.7
• NPSM: National Pipe Straight
Mechanical. Straight thread per
ANSI B1.20.1
• NPSL: National Pipe Straight
Loosefit per ANSI B1.20.1
• BSPP, BSPT: British Standard Pipe
Parallel, British Standard Pipe Taper.
BS21• quick connect fitting: a fitting
designed to quickly connect and
disconnect. These fittings come in
many styles and types.
• split flange fitting: a fitting
consisting of a flange retainer
and a flange of two halves. This
design allows the flanges to be
installed after the retainer has
been attached to the hose, making
the flange reusable. SAE code 61
and 62.
• tube fitting: a hose fitting of
which the mating end conforms to
a tube diameter. The mate or male
end of a compression fitting.
flammable gases/liquid/media:
a flammable gas, including liquefied
gas, is one having a closed cup flash
point below +100ºF (+37.8ºC) and a
vapor pressure greater than 25 psi
(174.2 KPa).
flex cracking: a surface cracking
induced by repeated bending and
straightening.
flow rate: a volume of media being
conveyed in a given time period.
fluid: a gas or liquid medium.
fluorocarbon: an organic
compound containing fluorine
directly bonded to carbon. The
ability of the carbon atom to form
a large variety of structural chains
gives rise to many fluorocarbons
and fluorocarbon derivatives.
EMEA Danfoss rubber hydraulic hose, fitting, tooling and accessories category catalog
337
Danfoss | Glossary & index
Glossary
