Rubber hydraulic hose and ... - Flipbook - Seite 338
Glossary & index | Danfoss
Glossary
FOR-SEAL: a product name for a
hose end configuration using an
o-ring sealing method, trademarked
by Danfoss Corporation.
G
J
jacket: a seamless tubular braided
or woven ply generally on the
outside of a hose.
NPT/NPTF: national pipe threads.
See fitting/coupling — pipe thread
fittings.
nylon: a family of polyamide
materials.
JIC: see fitting/coupling—JIC.
O
gpm: gallons per minute.
K
H
heat resistance: the property or
ability to resist the deteriorating
effects of elevated temperatures.
helix: a shape formed by spiraling a
wire or other reinforcement around
the cylindrical body of a hose;
typically used in suction hose.
hose: a flexible conduit consisting
of a tube, reinforcement, and usually
an outer cover.
hydrostatic testing: the use of
liquid pressure to test a hose or
hose assembly for leakage, twisting,
and/or hose change-in-length.
Hytrel: registered trademark of
Chemours.
I
I.D.: inside diameter.
identification yarn: a yarn of
single or multiple colors, usually
embedded in the hose wall, used to
identify the manufacturer.
impression: a design formed
during vulcanization in the surface
of a hose by a method of transfer,
such as fabric impression or molded
impression.
impulse: an application of force
in a manner to produce sudden
strain or motion, such as hydraulic
pressure applied in a hose.
innertube: the innermost layer of
a hose; the hose material in contact
with the medium.
insert: optional term for nipple. See
nipple.
interlocking clamp: a clamp
which engages the fitting in
a manner which prevents the
clamp from sliding off the fitting,
typically a bolt or U-bolt style with
interlocking fingers which engage
an interlock ring on the fitting.
interlocking ferrule: a ferrule,
which physically attaches to the
fitting preventing the ferrule from
sliding off the fitting.
ISO: International Organization for
Standardization.
338
kinking: a temporary or
permanent distortion of the hose
induced by bending beyond the
minimum bend radius.
L
layline: the line of printed
information that runs parallel on the
side of a manufactured hose giving
details such as part number, psi
rating, hose size, and manufacturing
data.
layer: a single thickness of rubber
or fabric between adjacent parts.
loop installation: the assembly is
installed in a loop or “U” shape, and
is most often used when frequent
and/or large amounts of motion are
involved.
LPG, LP Gas: liquefied petroleum
gas.
OAL: see overall length
O.D.: outside diameter.
OE/OEM: original equipment
manufacturer.
oil resistance: the ability of the
materials to withstand exposure
to oil.
oil swell: the change in volume
of a rubber article resulting from
contact with oil.
operating conditions: the
pressure, temperature, motion,
and environment to which a hose
assembly is subjected.
o-ring fitting: see fitting/
coupling—o-ring.
overall length (OAL): the total
length of a hose assembly, which
consists of the free hose length plus
the length of the coupling(s).
pitch: 1) the distance from
one point on a helix to the
corresponding point on the
next turn of the helix, measured
parallel to the axis; 2) the distance
between the two peaks of adjacent
corrugation or convolution.
plating: a material, usually metal,
applied to another metal by
electroplating, for the purpose of
reducing corrosion; typically a more
noble metal such as zinc is applied
to steel.
ply: an individual layer in hose
construction.
polymer: a macromolecular
material formed by the chemical
combination of monomers,
having either the same or different
chemical compositions.
pressure: force ÷ unit area. For
purposes of this document, refers
to PSIG (pounds per square inch
gauge).
pressure drop: the measure of
pressure reduction or loss over a
specific length of hose.
pressure, burst: the pressure at
which rupture occurs.
oxidation: the reaction of oxygen
on a material, usually evidenced
by a change in the appearance or
feel of the surface or by a change in
physical properties.
pressure, maximum allowable
working: the maximum pressure
at which a hose or hose assembly is
designed to be used. Abbreviated
as MAWP.
mandrel built: a hose fabricated
and/or vulcanized on a mandrel.
ozone cracking: the surface
cracks, checks, or crazing caused
by exposure to an atmosphere
containing ozone.
manufacturer’s identification:
a code symbol used on or in some
hose to indicate the manufacturer.
ozone resistance: the ability to
withstand the deteriorating effects
of ozone (generally cracking).
pressure, working: the maximum
pressure to which a hose will
be subjected, including the
momentary surges in pressure,
which can occur during service.
Abbreviated as WP.
M
MAWP: see pressure, maximum
allowable working.
media, medium: the substance(s)
being conveyed through a system.
P
N
NAHAD: National Association of
Hose & Accessories Distributors.
Neoprene: a registered trademark
of Chemours.
nipple: the internal member or
portion of a hose fitting.
nitrile rubber (NB/Buna-N): a
family of acrylonitrile elastomers
used extensively for industrial hose.
nominal: a size indicator for
reference only.
nomograph: a chart used to
compare hose size to flow rate to
recommended velocity.
permanent fitting: the type of
fitting which, once installed, may
not be removed for re-use.
permeation: the process of
migration of a substance into
and through another, usually
the movement of a gas into and
through a hose material; the rate
of permeation is specific to the
substance, temperature, pressure,
and the material being permeated.
pin pricked: perforations through
the cover of a hose to vent
permeating gases.
non-conductive: the inability to
transfer an electrical charge.
EMEA Danfoss rubber hydraulic hose, fitting, tooling and accessories category catalog
psi: pounds per square inch.
PVC: polyvinyl chloride. A low
cost thermoplastic material
typically used in the manufacture
of industrial hoses. The operating
temperature range is -295.5ºC to
+954.4ºC (-500ºF to +1750ºF).
R
reinforcement: the strengthening
members, consisting of either fabric,
cord, and/or metal, of a hose. See
ply.
reusable fitting/coupling: see
fitting/coupling—field attachable
fittings.
RMA: The Rubber Manufacturers
Association, Inc.
