slide 1: Hydraulic Hose
Fittings and
Flanges
slide 2: Hydraulic Hose is highpressure synthetic rubber
thermoplastic or reinforced hose that transfer fluid to
transmit force within hydraulic machinery. The hydraulic
machinery has been used since 1940 when engineers
discovered that hydraulic systems were more compact in
size light in weight selflubricating. The development of
hydraulic hoses opened the way for a development of a wide
array of brand new highpowered machines for military
applications. When it comes to the development of flexible
hydraulic hoses for the development of a wide array of high
powered machines that are based on hydraulic technology.
Typically Hydraulic hoses use the distribution of water in
order to operate or transform a part of the machinery. The
hydraulic hose fittings are connected transmitted hydraulic
power to another device. This kind of hydraulic fitting
required relies on the connection source. The Hose fittings
can come up with many ways such as Oring elbow pipe
flanges face seal flare less. SAE Society of Automated
Engineers sets the standards for all these hose fittings on
the machinery. Almost each hydraulic system the fittings
joins the lengths of the pipe hose which run between the
different parts of the system. These are hydraulic fittings
must be fitted in a manner for instance if the pipes get
damage or there is a requirement for the tubes to be
replaced or repaired. As they can be omitted easily. The
hydraulic fittings are categorized into two major parts:
1AllMetal Fittings
2ORing Fittings
3Metal Thread Fittings
4ORing Hydraulic Fittings
slide 3: Hydraulic fittings come up in different sizes in order join
hoses on the components. They deliver hydraulic fluid to
them in power. There is also heavy equipment such as dump
trucks back hoses that use hydraulic energy to widen truck
beds. When it comes to its measurements that needed to fit a
hydraulic fitting correctly that are embraced such as exterior
diameter length thread gauge angle of the fitting.
When the components within hydraulic systems had never to
be removed. The connections could be brazed or welded in
order to widen or enhance the reliability. Nevertheless it is
invariable that connections should be broken up to allow
replacing components. Therefore removable fittings are a
necessity for all but most of the specialized hydraulic
systems. At the end the fitting designs have advanced
considerably to enhance performance installation
convenience moreover the overall function of these
components that remain relatively unchanged.
Within the hydraulic system fitting seal fluid uses one of two
techniques for instance allmetal fittings rely on metalto
metal contact whilst Oring type fittings that contain
pressurized fluid by compressing an elastomeric seal.
AllMetal Fittings
You may notice threads on pipe fittings that are tapered and
it may rely on the stress generated by forcing. The pipe
threads are subject to leakage due to the fact that they are
torquesensitive over tightening misconducts the threads so
much. In addition they are subjected to loosen when
exposed to vibrations wide temperature vibrations. The
threads should be expected when pipe fittings are used in
slide 4: highpressure hydraulic systems. Since pipe threads are
tapered assemble disassemble that only makes the leakage
problem by distorting threads especially when a forged
fitting is used in the castiron port. It is highly recommended
for pipe fittings that are still another reason why most of the
designers believe them to be outdated for use in hydraulic
systems.
FlareType Fittings: On the other side the flare type
fittings were developed as an improvement over pipe fittings
before so many years. This probably remains the design used
most often in the hydraulic systems. To tighten the
assemblys nut that draws the fitting into the flared tube face
fitting body. 37° flare fittings are designed for the usage of
with thinwall to medium thickness tubing in the systems. It
is worked between the temperature range 65° to 400° F . For
forged components manufacturer this is something more
than most of other fittings and it can easily be adapted to
metric tubing. This is readily available plus one of the most
economical.
The flare less fittings are gaining wider acceptance in the
United States. This is due to the reason that they need
minimal tube preparation. Also it handles average fluid
working pressures it is more tolerant of vibrations as
compared to all metalfittings. At long lost the flare less
fittings should be used with medium or thickwalled tubing.
slide 5: Flareless: The flareless fittings need less tube preparation
and can handle an average of 3000 psi. It includes a ferrule
body which tightens onto the nuts of fittings.
Elbow: This kind of fitting comes up with several sizes i.e.
45º for both male female plus 37º and 90º.
Flanges: These are for tube fittings that are larger than
1 inch one inch in size.
Oring Type Fitting
It may surprise you that leakage in hydraulic systems that
could have been omitted more than a generation ago.
However the leakfree hydraulic operations had always been
desirable. This need has become acuter with highest
operating pressures which became necessary.
With highest hydraulic fluid leakage has brought up by
higher pressure. It is worked up under the umbrella of the
committee of tubing piping of SAE. Fittings that use Orings
for tight connections that continue to gain the acceptance by
equipment designers around the worldwide. In precision
machined components manufacturers there are three
basic types that are available such as:
• Oring Flange Fittings
• Oring Boss Fittings
• Face Seal Or Flat Face Oring FFOR Fittings
slide 6: When it comes to a choice between FFOR fittings or Oring
boss it usually depends on such factors wrench clearance
fitting location or individual preference.
The flange connections usually used with tubing which has
an OD Outer Diameter greater than 7 to 8 inches or the
applications are involved extremely high pressures.
Generally Oring boss fittings fall into two groups i.e.
adjustable and nonadjustable. The nonadjustable fitting
includes connectors plugs. All these are simply screwed
into the port and there is no alignment is needed. When it
comes to adjustable boss fittings then it includes elbows
tees and needs to be oriented in a specific direction. The
fundamental difference between two is that the plugs
connectors have zero lock nuts it also requires no backup
washer to effectively a joint.
Metal Thread Fittings
These fittings make use of meshing threads of two parts of
the pipes to seal the joints for pressurized hydraulic fluid.
The hydraulic joints are acceptable absolute perfect
conditions. These sorts of metal fittings are less reliable for
usage as they are vulnerable to vibration temperature
shock damage.
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