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SEO Version
4300 Catalog
Appendix
V19
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
Mild Steel:
Carbon steel with a maximum of .25 percent
carbon.
Nitriding:
A case hardening process conducted by the introduc-
tion of nitrogen into the surface of a solid ferrous alloy.
Nitrile (Buna N):
A copolymer of butadienne and acrylonitrile.
It is the elastomer most widely used to manufacture O-rings.
Nondestructive:
Inspection or test by methods that do not
destroy the part.
O-ring:
A torus, or doughnut shaped object, generally made
from elastomer and is used primarily for sealing.
Passivation:
A process used to improve corrosive behavior
of a metal by changing its chemically active surface to a much
less reactive state.
Pipe:
(l)The defect inwrought or cast products resulting from the
central cavity formed by contraction in metal, especially ingots,
during solidification. (2) A tubularmetal product that includes iron
pipe size (I.P.S.) and schedule number in its classification.
Pipe Thread, Dry Seal:
Tapered pipe threads in which sealing
is a function of root and crest interference.
Pitting:
Forming small sharp cavities in a metal surface by
corrosion, mechanical action or nonuniform electrodeposition.
Plastic Deformation:
Deformation that does or will remain
permanent in an element after removal of the stress that
caused it.
Pneumatics:
Engineering science pertaining to gaseous pres-
sure and flow.
Port:
A terminus of a passage in a component to which
conductors can be connected.
Port, Pipe:
A port which conforms to pipe thread standards.
Port, StraightThread:
A port which conforms to straight thread
standards. It typically employs an O-ring compressed in a
wedge-shaped cavity.
Power Supply, Fluid:
Energy source which generates and
maintains a flow of fluid under pressure.
PrecipitationHardening:
Hardeningcausedby theprecipitation
of a constituent from a supersaturated solid solution.
Pressure:
Force per unit area, usually expressed in pounds
per square inch (psi).
Pressure, Absolute:
The pressure above absolute zero, i.e.,
the sum of atmospheric pressure plus gage pressure.
Pressure, Atmospheric:
Pressure exerted by the atmosphere
at any specific location. [Sea level atmospheric pressure is
approximately 14.7 pounds per square inch (about 1 bar)]
Pressure, Burst:
The pressure which causes failure of, and
consequential loss of fluid through the product envelope.
Pressure, Cyclic Test:
A pressure range applied in cyclic
endurance tests that are performed to help determine recom-
mended working pressure.
Pressure,Differential (PressureDrop):
Thedifference inpres-
sure between any two points of a system or a component.
Pressure, Gage:
Pressure differential above or below ambient
atmospheric pressure.
Pressure,Nominal:
A pressure value assigned to a component
or system for the purpose of convenient designation.
Pressure, Operating:
Se
Pressure, Proof:
The non-destructive test pressure, in excess
of the maximum rated operating pressure, which causes no
permanent deformation, external leakage, or other resulting
malfunction.
Pressure, Rated Dynamic:
The maximum fluctuating pressure
load that apressure containingenvelope is capableof sustaining
for a minimum of 1 million operating cycles without failure.
Pressure,RatedStatic:
Themaximumpressure that apressure
containingenvelope is capableof sustaining inanapplicationnot
exceeding 30,000 operating cycles in a system free of pressure
surges, shocks, vibration, temperature excursions, etc.
Pressure, Relief:
The pressure at which the relief valve is set
for actuation. This pressure is generally slightly higher than the
system working pressure.
Pressure Shock:
A pressure wave front whichmoves at a sonic
velocity, due to sudden stoppage of fluid flow.
Pressure, Static:
The pressure in a fluid at rest.
Pressure, Surge:
The pressure increases resulting from pres-
sure fluctuations in a hydraulic system.
Pressure, Working:
The pressure at which the apparatus is
being operated in a given application.
Pressure, Working Rated:
The qualified operating pressure
which is recommended for a system or a component by the
manufacturer.
Proof Load:
A pre-determined load, generally some multiple of
the service load, to which a specimen or structure is submitted
before acceptance for use.
Quenching:
Rapid cooling method used in heat treating pro-
cess.
Residual Stress:
Stress existing in a body that is free of external
forces or thermal gradients.
Rockwell Hardness Test:
A test for determining the hardness
of a material based upon the depth of penetration of a specified
penetrator into the specimen.
Roughness:
Relatively finely-spaced surface irregularities, the
height, width and direction of which establish the predominant
surface pattern.
STP:
Distributed by First Brand Corp. Danbury, CT.
Scaling:
(1) Forminga thick layer of oxidationproductsonmetals
at high temperatures. (2)Depositingwater-insolubleconstituents
on a metal surface, as in cooling tubes and water boilers.
Seam:
A fold or lap on the surface of a metal appearing as a
crack, usually resulting from a defect obtained in casting or in
working.
Segregation:
Concentration of alloying elements in specific
regions in a metallic object.
Glossary
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