dichtomatik

Transcription

dichtomatik

DICHTOMATIK
U-Rings
Albert-Schweitzer-Ring 1
D-22045 Hamburg
P.O. Box 70 04 80
D-22004 Hamburg
Phone +49/40/66 98 90
Fax +49/40/66 98 91 01
[email protected]
www.dichtomatik.de
DIN EN ISO 9001:2000
Contents
Dichtomatik
5
Dichtomatik on the Internet
6
U-Rings
9
Materials
10
General notes
for installation
12
Installation housings
13
Overview of U-rings
14
Individual descriptions
Subsidiaries
from 16
163
Dichtomatik
Any seal. Any time.
Dichtomatik is known as a specialist in
technical seals – and nothing but seals.
The company's comprehensive range
of products for industrial applications,
its worldwide network of highly efficient
production partners and its own
developments make Dichtomatik a
highly competent partner. Customers
are guaranteed the best possible
support in terms of speed, flexibility
and application expertise.
To ensure fast and punctual delivery to
all parts of the world, Dichtomatik has
continuously expanded its network of
subsidiaries, of which there are
currently eight in Europe: in England,
Sweden, the Netherlands, France,
Austria, Hungary, Italy and the head
office in Germany, as well as five
locations in the USA and Canada.
Carefully selected partners are
responsible for Central and South
America, Africa and Asia.
The Dichtomatik team is committed to
living up to the corporate slogan
"Any seal. Any time." It devotes all its
attention to the customer – when
dealing with everyday orders,
obtaining a special seal or providing
complex technical advice, we always
want the work we do to set standards.
Advice on applications, designing installation housings, altering designs,
adapting standard seals to changes in
ambient conditions – these are some of
the daily demands we make of our
application engineers. As highly
experienced seal specialists they are
familiar with all questions regarding
applications and materials and they
work closely with customers and
suppliers. Application-specific developments and adaptations of constructions
and materials are just as much part of
the job as supervising product series
until they are ready for production.
5
Dichtomatik
on the Internet
www.dichtomatik.de
www.dichtomatik.de
The Dichtomatik website provides a
virtual insight into the warehouse.
Both the availability of all standard seals
and technical information on the seal articles, including descriptions of materials
and installation instructions, can be accessed at www.dichtomatik.de. Having
been issued a personal password, customers can view prices, make enquiries
and place orders around the clock.
6
U-rings
U-rings are among the most important
seals used in hydraulics and pneumatics.
Their main function is to seal the cylinder
on the piston or piston rod. Whether in
an unpressurised state or under pressure,
they prevent the medium escaping from
the cylinder, thus ensuring the cylinder
function.
Materials, design and placing
sequence must be adapted to the varying
requirements. Whether a U-ring should
be made of pure elastomer or whether it
should have a support ring, if necessary
integrated in a fabric back, depends on
the design of the particular cylinder in
question.
The characteristics which distinguish
U-rings are on the one hand the
geometry of the diameter – here a
distinction is always made between
symmetric and asymmetric designs –
but also in the shape and final
processing of the sealing lips.
Different U-ring geometries and
materials should be chosen for heavyduty applications with high safety
aspects and little movement, e.g. in
derrick cylinders for cranes or hydraulic
cylinders in barrages, than those
required for working cylinders of earthmoving machinery where the focus is on
high resistance to wear. Totally different
designs and materials to those used in
hydraulics are on the other hand
required for pneumatic cylinders.
Symmetrical U-rings can be used as
piston seals as well as piston rod seals.
Asymmetrical U-rings are designed only
as piston or piston rod seals. They are
optimally adapted to the applications.
The function that all U-rings have in
common is diameter energising. The
oversized lips allow them to be pressed
on to the surrounding sealing surface
when built-in, creating linear force
around the circumference: in the seal
groove and on the dynamic side of the
seal, the piston rod and/or the running
surface of the cylinder.
The U-ring’s sealing function is
guaranteed even in this unpressurized
state. The hydraulic liquid is held back
at the sealing site which enables a
further increase in pressure. This pressure
build-up results in the hydraulic contact
pressure of the medium against the seal
lips overriding the energising factor. The
movement of the dynamic side completes
the sealing mechanism. The higher
the liquid pressure, the more intensive
the contact pressure of the seal on the
surrounding surfaces and the greater
the sealing function.
9
The requirements of the task and
the possibilities of the U-ring must be
carefully balanced as these have a
decisive influence on the selection of
the seal and the resulting operating
safety of the system.
Materials
Acrylonitrile-butadiene
caoutchouc – NBR
NBR is the most commonly used
material in all areas of seal
technology due to its good physical
and mechanical characteristics and
its excellent processing abilities.
For U-rings it is used in hardnesses
between 75 and 90 Shore A and for
O-rings as energising elements it is
generally used in 70 Shore A.
This elastomer has the rigidity, hardness
and abrasion resistance necessary
for U-rings.
NBR is resistant to most oils and
mineral oil based fats used in hydraulics
and also to their emulsions with water.
NBR materials have only moderate
resistance against weathering and ozone
influences if they are not specially
developed for these applications.
However, the standard resistance is
sufficient for most applications of U-rings
and their energising elements made
of NBR as with typical applications in
hydraulics, the elastomer surfaces are
moistened with oil or fat. These media
form a stable surface protective layer
and minimise the intensity of ozone
influence.
Generally, the standard NBR 90 quality
which is used for most U-rings can be
applied at temperatures from -30° C to
+100° C. The temperature application
limits for NBR 70 O-rings as energising
elements in U-rings is also from – 30 ° C
to +100 ° C but under special
circumstances for both parts a
temperature as low as – 40 ° C is
still acceptable.
NBR is processed in moulding tools in
various compression and vulcanising
processes to form U-rings or O-rings.
Fabric materials
Fabric materials are textiles or nonspecific fibrous materials which are
impregnated with elastomer materials.
With textiles that have a woven
structure, a distinction is made according
to the thickness or weight per surface
area, known as grammage. Another
distinguishing characteristic is the basic
material these textiles are made of, e.g.
cotton or synthetic fibre. Cotton textile
impregnated with NBR is most frequently
used for the production of standard
U-rings. Apart from the standard
materials, there is a whole range of
other textiles available and almost all
elastomers for impregnation.
Impregnated fabric materials
have numerous advantages over pure
elastomers. The most important are,
compressive creep resistance, extrusion
safety, dimensional stability and low
friction and wear behaviour. They also
show little inclination to swelling in
hydraulic media and are well-suited
to applications at low temperatures.
In a two-stage process, the fabric
materials are preprocessed into slugs
and then vulcanised into seals in a
compression moulding die with heat
application. A multi-component seal
can be produced out of pure elastomer
which is moulded on.
Polyurethane
Polyurethane is one of the group of
elastic thermoplastic materials which
have been established in seal technology
for many years due to their physical
characteristics and efficient processing
features. Polyurethan at a hardness
range of between 65 and 98 Shore A
is used.
Among the most important material
characteristics are its great tensile
strength, good wear resistance, good
10
flexibility at a temperature range from
– 40° C to +100° C and also good
ageing stability against ozone.
The mineral oil based oils and fats
used in hydraulics have a minimal
influence on the physical properties
of Polyurethane.
Polyurethane AU 92
AU 92, with very few exceptions, in
the polyurethane used for U-rings. The
characteristics of this type of material
unite the appropriate rigidity, hardness
and in particular, abrasion resistance
necessary for U-rings. The injection
moulding process applied in most
cases requires complex machinery
and moulding tools and for this reason
is most appropriate for large-scale
production.
Polytetrafluorethylene (PTFE)
PTFE has numerous positive
characteristics which have become
indispensable in seal technology. In
particular, we would like to emphasise
the characteristics which are essential
for its application as U-ring material:
PTFE is distinguished by exceptional
rigidity and very good gliding
characteristics. Due to its extremely
low surface energy, it has a very low
coefficient of friction (values of under
0.02 are known) and exceptional
non-bonding, non-wettable contact
surfaces. In addition, its extreme
hydrophobia must be mentioned:
PTFE is absolutely water-repellent.
It is resistant to almost all chemicals
and remains stable within an extremely
wide temperature range. Apart from
this, it is immune to attack by oxygen,
ozone or ultra-violet rays and is
therefore completely resistant to
weathering.
PTFE does not contain any
extractable media which could
11
drift off and adversely affect adjacent
materials. It is therefore physiologically
completely harmless in contact with
foodstuffs and also particularly wellsuited for applications in the
pharmaceutical and medicinal fields.
Combined with different compounds,
PTFE has proved to be excellent
material for U-rings. In particular,
PTFE/carbon with a 15 % – 25 %
proportion of carbon improves the
wear resistance of the material which
already has excellent gliding
characteristics. The pressure hardness
is also increased by this additive.
PTFE alone is only slightly elastic. For
this reason the activation of U-rings is
compensated with elastic energising
elements in the form of stainless steel
springs.
Polyoxymethylene POM
Polyoxymethylene is a thermoplastic
material and is distinguished by its
particularly high pressure load bearing
ability, rigidity and hardness.
Apart from its application as a pure
material, POM can be compounded
with extenders to further improve the
compressive creep resistance and wear
resistance which results in a longer
service life. Due to POM's low water
absorption it is not subjected to any
volume change which is not always
the case with thermoplastics.
Due to its excellent characteristics
under extreme loads, POM is often
processed as a seal accompanying
element, e.g. as a support ring or
a piston guiding element with an
angular design.
With a temperature range from
– 40° C to +100° C, POM can be used
in almost all standard seal application
areas.
Polyoxymethylene is processed by
injection moulding in most cases. The
slugs can also be processed in a chip
removal process.
FPM fluorcaoutchouc
The FPM elastomer is distinguished by
its excellent chemical and temperature
resistance (from – 20° C to +200° C).
It therefore plays an important part as
a U-ring material outside the standard.
Due to the above characteristics it is
essential to use FPM when extremely
high temperatures occur in the
surrounding of the hydraulic cylinder
and highly flammable type D liquids
have to be used.
FPM is generally used in 90 Shore A
and can also be processed in
combination with metal.
General notes
for installation
Although the materials used in our
U-rings are particularly effective and
robust, special care is still required
during installation in order to avoid
mechanical damage especially to the
sealing lip. This would inevitably lead
to leakage. Furthermore, the U-rings
should be checked prior to installation
for damage or ageing that could have
occurred during transportation or
storage. To ensure safe installation, the
following precautions should be taken:
1. Installation of the seal must take
place with the prestressed side facing
the direction of pressure. Particular care
must be taken with compact U-rings as
the prestressed side is not allways easily
recognisable.
2. Lead-in chamfers on the cylinder
and on the piston rod are essential.
The recommended lengths and angles
are given in the installation dimensions
for the various U-rings in this catalogue.
5. Tips of screws and grooves for guide
elements, etc. should be covered using
an installation cone, as the seal must not
be pushed over gaps, drillings or rough
surfaces.
6. Cylinders, rods, seals and installation
tools must be greased or oiled before
installation, giving consideration to
compatibility with the medium.
7. Materials are made smoother and
expand a great deal more easily for
installation if they are heated in oil or
hot water at approx. 80°C, giving
consideration to the resistance.
8. Any tools used for installation,
e.g. cones and mandrels for expansion,
should be made of soft material
(e.g. POM) and not have any sharp
edges.
3. Sharp edges must be deburred
and radii and chamfers applied in
accordance with the installation
guidelines.
4. Dust, dirt, metal chips and any
other foreign particles must be carefully
removed.
Expanding mandrel
(plastic e.g. POM)
Conical assembly tool
(plastic or metal)
Conical assembly tool
5°
U-ring
12
Installation housings
The function and service life of a
hydraulic or pneumatic cylinder
depend to a great extent on the sealing
elements used. During operation, these
are subject to various stresses and must
therefore be adapted to the different
requirements in terms of material,
structure and arrangement. The key
criteria are media compatibility and
temperature resistance, pressure, friction,
wear resistance, stroke speed and
frequency as well as service life. Seals,
grooves and wipers should already be
selected in the construction phase of
the cylinder so that the finish of the metal
surfaces and the design and dimensions
of the grooves can be carefully
manufactured in accordance with the
installation housing guidelines.
Rounded corners in the groove base (1)
ensure the correct position of the U-ring
and rounded flanks of the groove’s edges
(2) minimise the risk of the seal moving
into the metal gap. The suitable surface
finish of the groove base (3) and the
groove flanks (4), adherence to the
tolerances for the groove width (5),
the lead-in chamfer (6) and the
dimensions of the seal gap on the side
opposite the pressure (7), as well as the
surface finish of the opposed surface (8),
play a major role in ensuring the optimal
service life of the seals.
U-rings can generally be installed in
cut housing grooves. However, wider
profiles and particularly small inner
diameters require an axial opening to
the housing. The fit must be taken into
consideration accordingly, which requires
special experience. Should you require
advice, please contact our technical department.
Sufficient guiding for the pistons and
the piston rods must be ensured, as
seals can never perform guiding tasks.
Wipers ensure that no foreign particles
enter the medium system of a cylinder
that could destroy the seals. In order to
retain a clean system and to protect the
environment against oil pollution, no
hydraulic cylinder should be used
without a wiper.
5
4
4
7
2
6
8
3
1
5
1
4
1
4
7
8
3
6
2
13
Overview of
U-rings
Ref.
Pressure Temp.
(bar)
(°C)
Speed Materials
(m/s)
Dimensions
Page
metr.
inch
Design
U-rings
MA 13
Piston seal
250
– 30
+100
0,5
NBR-impregnated
fabrice
m
16
MA 14
Piston seal
700
– 30
+100
0,5
NBR-impregnated
fabrice/NBR/POM
m
18
MA 15
Piston-/Rod
seal
180
– 30
+100
0,5
NBR/NBR-impregn.
fabrice
m
MA 16
Rod seal
400
– 30
+100
0,5
MA 17
Piston seal
400
– 30
+100
0,5
NBR/NBR-impregn.
fabrice/POM
m
m
28
MA 18
Piston seal
400
– 30
+100
0,5
NBR/NBR-impregn.
fabrice/POM
m
m
32
MA 21
Piston-/Rod
seal
160
– 30
+100
0,5
NBR 90
m
m
36
MA 22
Piston-/Rod
seal
100
– 30
+100
0,5
NBR 90
m
m
56
MA 23
Piston seal
80
– 30
+100
0,5
NBR 75
m
m
68
MA 24
Rod seal
160
– 30
+100
0,5
NBR 90
m
m
78
MA 25
Piston-/Rod
seal
300
– 40
+100
0,5
NBR/NBR-impregn.
fabrice/POM
AU 92
m
m
20
m
24
m
m
84
14
Overview of
U-rings
Ref.
Pressure Temp.
(bar)
(°C)
Speed Materials
(m/s)
Dimensions
Page
metr.
inch
Design
U-rings
15
MA 28
Piston seal
400
– 40
+100
0,5
AU 92
m
MA 30
Rod seal
400
– 40
+100
0,5
AU 92
m
m
110
MA 39
Rod seal
400
– 40
+100
0,5
AU 92
m
m
118
MA 41
Rod seal
400
– 40
+100
0,5
MA 36
Piston-/Rod
seal
400
– 40
+100
0,5
AU 92
m
MA 35
Rod seal
400
– 40
+100
0,5
AU 92
m
MA 37
Rod seal
400
– 40
+100
0,5
AU 92/POM
MA 42
Piston-/Rod
seal
400
– 40
+100
0,5
AU 92/NBR 70
MA 43
Rod seal
350
–150
+250
15
PTFE-compounds
spring steel
AISI 301
m
152
MA 44
Piston seal
350
–150
+250
15
PTFE-compounds
spring steel
AISI 301
m
156
AU 92/POM
104
126
m
128
132
m
138
m
m
140
MA 13
compact piston seal. It consists of
a preformed fabric back and an
elastomer part which are vulcanized
together to form a single unit.
Standard materials
NBR
NBR-impregnated cotton fabric
Area of application
Hydraulics
reciprocating movements
Function
The MA 13 is a single function piston
seal and is particularly well-suited for
cylinders with one-sided pistons. Its
effective sealing function results from
its compact design. It is provided with
radial self energising which is activated
by the hydraulic system pressure.
Due to the high proportion of fabric in
the seal profile, this seal displays much
less frictional behaviour than the classic
elastomer seal. In addition, the fabric
back provides very effective protection
against fission extrusion.
The elastomer serves as an energising
element in the seal head and produces
constant contact pressure of the sealing
lips on the adjacent surface. For this
reason, the sealing function is fully
retained even at low and zero pressure.
Media
Hydraulic oils acc. DIN 51524/51525,
lubricating oils, mineral oil based
lubricating fats, non-flammable
hydraulic fluids HFA, HFB, HFC acc.
VDMA 24317.
Operational application limits
Pressure (MPa/bar): 25/250
Temperature (°C): – 30 to + 100
Running speed (m/s): = 0.5
Installation
The MA 13 can only be installed by
hand in axially accessible housing. To
push the piston body and seal into the
cylinder pipe without damaging it, a
lead-in chamfer C acc. to the following
table is required:
Profile width (mm) Lead-in chamfer C (mm)
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
If the housing is provided with a metallic
fitting on the side opposite the pressure,
the service life of the seal is lengthened.
Within the operating parameters given
above, a metallic wedge can be fitted
between the cylinder pipe and piston
acc. to the following table:
Profile width (mm) Radial wedge G (mm)
4
0.1
5
0.1
7.5
0.15
10
0.2
12.5
0.2
15
0.2
20
0.2
25
0.2
The piston diameter d1 should generally
be 1.5 mm smaller than the DN diameter
provided.
Please also follow the general installation
instructions on page 12 of this catalogue.
Remarks
The nominal widths marked in red on
the following pages represent standard
dimensions. They are generally in stock
or can be delivered at short notice. All the
other dimensions listed are not standard
and although also available at short notice
may be subject to a minimum purchasing
quantity.
In addition, we are able to produce any
other dimensions required. For operating
conditions other than the standard
applications, further elastomer and fabric
materials are available.
16
MA 14
compact piston seal. It consists of
a preformed fabric back and an
elastomer part which are vulcanized
together to form a single unit. A
support ring is integrated on the outer
diameter of the seal.
Standard materials
NBR
POM
Area of application
Hydraulics
Function
seal and is particularly well-suited for
cylinders with one-sided pistons. Its
effective sealing function results from
its compact design. It is provided with
by the hydraulic system pressure.
Due to the high proportion of fabric in
the seal profile, this seal displays much
less frictional behaviour than the classic
elastomer seal. In addition, the fabric
back with the integrated support ring
made of synthetic material provides
very effective protection against fission
extrusion, even at high pressure loads.
The elastomer serves as an energising
element in the seal head and produces
constant contact pressure of the sealing
lips on the adjacent surface. For this
reason, the sealing function is fully
retained even at low and zero pressure.
Media
VDMA 24317.
Profile width (mm)Lead-in chamfer C (mm)
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
above, depending on the pressure, a
metallic wedge can be fitted between the
cylinder pipe and piston acc. to the
following table:
Pressure (MPa)
5
10
20
30
40
50
60
70
Radial wedge G (mm)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.2
provided.
Remarks
quantity.
Installation
table is required:
18
MA 15
piston and piston rod seal with
symmetrical sealing lips which are
cut at an angle of less than 45°. The
lip segment made of elastomer and the
fabric block at the back are vulcanized
together to form a single unit.
Standard materials
NBR
Area of application
Hydraulics
Function
and piston rod seal in the form of a
U-ring. Its sealing function is very
effective due to the sealing lips being
provided with radial self energising
which is activated by the system pressure.
Due to the symmetrical sealing lips
and the proportion of fabric in the seal
profile, this U-ring displays much less
frictional behaviour than the classic
elastomer seal. The fabric back stabilises
the profile and in addition, provides
very effective protection against fission
extrusion.
Media
VDMA 24317.
Installation
hand in axially accessible housing.
With an inner diameter greater than
25 mm and a thinner profile, it can also
be inserted in a cut piston rod groove.
To push the piston body and seal into
the cylinder pipe or over the piston rod
without damaging it, a lead-in chamfer
C acc. to the following table is required:
Profile width (mm)
4
5
7.5
10
12.5
15
20
25
Lead-in chamfer C (mm)
2
2.5
4
5
6.5
7.5
10
10
above, depending on the pressure,
depending on the pressure, a metallic
wedge can be fitted between the cylinder
head and piston rod or cylinder pipe
and piston acc. to the following table:
Pressure
5
10
18
(MPa)
0.5
0.3
0.2
Radial wedge G (mm)
provided.
Remarks
and although also available at short
notice may be subject to a minimum
purchasing quantity.
20
MA 16
cut at an angle of less than 45°. The
lip segment made of elastomer and the
fabric block at the back are vulcanized
together to form a single unit. A support
ring is integrated on the inner diameter
of the seal unit.
Standard materials
NBR
POM
Area of application
Hydraulics,
Function
and piston rod seal in the form of a
U-ring. Its sealing function is very
effective due to the sealing lips being
provided with radial self energising
which is activated by the system pressure.
Due to the symmetrical sealing lips
and the proportion of fabric in the seal
profile, this U-ring displays much less
frictional behaviour than the classic
elastomer seal. The fabric back
stabilises the profile and the semi-active
support ring on the inner diameter
protects against fission extrusion.
Media
VDMA 24317.
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
cylinder head and piston rod acc. to the
following table:
Pressure (MPa)
5
10
20
30
40
Radial wedge G (mm)
1.0
0.9
0.7
0.6
0.6
Remarks
quantity.
Installation
hand in axially accessible housing.
With an inner diameter greater than
25 mm and a thinner profile, it can also
be inserted in a cut piston rod groove.
To push the cylinder head and seal over
the piston rod without damaging it, a
table is required:
24
MA 17
piston seal with symmetrical sealing lips
which are cut at an angle of less than
45°. The lip segment made of elastomer
and the fabric block at the back are
vulcanized together to form a single unit.
A support ring is integrated on the outer
diameter of the seal unit.
Standard materials
NBR
POM
Area of application
Hydraulics
Function
seal in the form of a U-ring. Its sealing
function is very effective due to the
sealing lips being provided with radial
self energising which is activated by the
system pressure. Due to the symmetrical
sealing lips and the proportion of fabric
in the seal profile, this U-ring displays
much less frictional behaviour than the
classic elastomer seal. The fabric back
stabilises the profile and the semi-active
support ring protects against fission
extrusion even at high loads.
Media
VDMA 24317.
Installation
table is required:
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
metallic wedge can be fitted between
the cylinder pipe and piston acc. to the
following table:
Pressure (MPa)
5
10
20
30
40
Radial wedge G (mm)
1.0
0.9
0.7
0.6
0.6
provided.
Remarks
quantity.
28
MA 18
piston seal with symmetrical sealing lips
which are cut at an angle of less than
45°. The lip segment made of elastomer
and the fabric block at the back are
vulcanized together to form a single unit.
An angular guide ring is integrated on
the outer diameter of the seal unit.
Standard materials
NBR
POM
Area of application
Hydraulics
medium and higher pressure
Function
seal in the form of a U-ring. Its sealing
function is very effective due to the
system pressure. Due to the symmetrical
sealing lips and the proportion of fabric
in the seal profile, this U-ring displays
much less frictional behaviour than the
classic elastomer seal. The fabric back
stabilises the profile. The semi-active
angle ring on the outer diameter guides
the piston and protects against fission
extrusion.
Media
VDMA 24317.
Temperature (° C): – 30 to + 100
Installation
table is required:
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
cylinder head and piston rod or cylinder
pipe and piston acc. to the following
table:
Pressure (MPa)
5
10
20
30
40
Radial wedge G (mm)
1.0
0.9
0.7
0.6
0.6
provided.
Remarks
quantity.
32
MA 21
symmetrical sealing lips which
are cut at an angle of less than 45°.
Standard material
NBR 90
Area of application
Hydraulics and pneumatics
Function
seal in the form of a U-ring which can
be used as a piston and piston rod seal
due to its symmetrical sealing lips. Its
sealing function is very effective due
to the sealing lips being provided with
by the system pressure.
Media
VDMA 24317.
Pressure (MPa/bar) : 16/160
Installation
The MA 21, with an inner diameter of
25 mm and a thinner profile can always
be installed in cut housing. With an
inner diameter of less than 25 mm, we
recommend axially accessible housing.
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
following table:
Pressure (MPa)
5
0.2
10
0.15
16
0.1
Radial wedge G (mm)
be by factor 0.65 of the profile smaller
than the DN diameter provided.
Remarks
quantity.
applications, further elastomers are
available.
36
MA 22
symmetrical sealing lips which
are cut straight.
Standard material
NBR 90
Area of application
Function
sealing function is very effective due to
the sealing lips being provided with
by the system pressure. For new design
we recommend MA 23 or MA 24.
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
following table:
Pressure (MPa)
5
10
Radial wedge G (mm)
0.2
0.15
Media
VDMA 24317.
Pressure (MPa /bar): 10/100
Remarks
quantity.
Installation
The MA 22, with an inner diameter of
be installed in cut housing. With an
inner diameter of less than 25 mm, we
available.
56
MA 23
piston seal with asymmetrical sealing
lips which are cut at an angle of less
than 45°.
Standard material
NBR 75
Area of application
Function
seal in the form of a U-ring. Due to its
asymmetrical sealing lips with a slightly
indented outer lip edge, the energising
is guided outwards to strengthen its
sealing function also at low pressure.
Media
VDMA 24317.
Installation
The MA 23 can be installed in cut
housing. To push the piston body and
seal into the cylinder pipe without
damaging it, a lead-in chamfer C acc.
to the following table is required:
following table:
Pressure (MPa)
8
Radial wedge G (mm)
0.1
Remarks
quantity.
available.
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
68
MA 24
piston rod seal with asymmetrical
sealing lips which are cut at an angle
of less than 45°.
Standard material
NBR 90
Area of application
Function
rod seal in the form of a U-ring. Due to
its asymmetrical sealing lips with a
slightly indented outer lip edge, the
pressure is guided outwards to strengthen
its sealing function at low pressure.
Media
VDMA 24317.
Installation
The MA 24, from an inner diameter of
25 mm and thin profile can always be
installed in cut housing. With an inner
diameter of less than 25 mm, we
the piston rod without damaging it, a
table is required:
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
following table:
Pressure (MPa)
5
10
11
Radial wedge G (mm)
0.2
0.15
0.1
Remarks
quantity.
available.
78
MA 25
cut at an angle of less than 45°.
Standard material
Polyurethane AU 92
Area of application
Hydraulics
Function
seal function is very effective due to the
system pressure. Due to the high wear
resistance of polyurethane, this seal has
a particularly long service life. For new
design we recommend MA 30 or MA 28.
Media
VDMA 24317.
< +40 in HFa, HFB, HFC
Installation
be installed in cut housing. Due to the
high tensile and strength of polyurethane,
it is necessary to use installation tools for
thick seals. With an inner diameter of
less than 25 mm, we recommend axially
accessible housing. To push the piston
body and seal into the cylinder pipe or
over the piston rod without damaging it,
a lead-in chamfer C acc. to the following
table is required:
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
the cylinder head and piston rod or
cylinder pipe and piston acc. to the
following table:
Pressure (MPa)
5
10
20
30
Radial wedge G (mm)
0.6
0.5
0.35
0.3
Remarks
quantity.
applications, other polyurethane materials
are available.
84
MA 28
piston seal with asymmetrical
sealing lips which are cut at an
angle of less than 45°.
Standard material
Polyurethane AU 92
Area of application
Hydraulics
extreme loads
Function
seal in the form of a U-ring. Its excellent
suitability for extreme loads, which is for
example required for application in the
working cylinders of heavy earth-moving
machines, is provided by the synergy
between the geometric of this seal and
the special material characteristics of
polyurethane. It guarantees effective
sealing at low and zero pressures as
well as the most difficult operational
conditions which would overload
conventional elastomer or fabric U-rings.
Media
VDMA 24317.
< +40 in HFA, HFB, HFC
Installation
The MA 28, with a thin profile can
always be installed in cut housing.
Due to the high strength of polyurethane,
it is necessary to use intallation tools
for thick seals. To push the piston body
and seal into the cylinder pipe without
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
following table:
Pressure (MPa)
5
10
20
30
40
Radial wedge G (mm)
0.6
0.5
0.35
0.3
0.25
Remarks
quantity.
are available.
104
MA 30
sealing lips which are cut at an angle
of less than 45°.
Standard material
Polyurethane AU 92
Area of application
Hydraulics
extreme loads
Function
suitability for extreme loads, which is for
example required for application in the
working cylinders of heavy earth-moving
machines, is provided by the synergy
between the geometric of this seal and
the special material characteristics of
polyurethane. It guarantees effective
sealing at low and zero pressures as
well as the most difficult operational
conditions which would overload
conventional elastomer or fabric U-rings.
Media
VDMA 24317.
< +40 in HFA; HFB; HFC
Installation
25 mm and a thin profile, can always be
installed in cut housing. Due to the high
strength of polyurethane, it is necessary
to use installation tools for thick seals.
With an inner diameter of less than 25
mm, we recommend axially accessible
housing. To push the cylinder head and
seal over the piston rod without
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
following table:
Pressure (MPa)
5
10
20
30
40
Radial wedge G (mm)
0.6
0.5
0.35
0.3
0.25
Remarks
quantity.
are available.
110
MA 39
sealing lips which are cut at an
angle of less than 45°. There is a
second seal edge on the inner diameter.
Standard material
Polyurethane AU 92
Area of application
Hydraulics
extreme loads
Function
suitability for extreme loads is provided
by the synergy between the geometric
of this seal and the special material
characteristics of polyurethane. It
guarantees effective sealing at low
and zero pressures as well as the most
difficult operational conditions which
would overload conventional elastomer
or fabric seals. The second seal edge
supports the sealing function on the
upward stroke of the rod and also wipes
remaining dirt from the atmospheric side
on the downward stroke of the rod.
Media
VDMA 24317.
Temperature (° C): -– 40 to + 100
< + 40 in HFA; HFB; HFC
Installation
25 mm and a thin profile can always be
strength of polyurethane, it is necessary
to use installation tools for thick seals.
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
following table:
Pressure (MPa)
5
10
20
30
40
Radial wedge G (mm)
0.6
0.5
0.35
0.3
0.25
Remarks
or can be delivered at short notice. All
the other dimensions listed are not
standard and although also available at
short notice may be subject to a minimum
purchasing quantity.
applications, other polyurthane materials
are available.
With an inner diameter of less than 25
mm, we recommend axially accessible
housing. To push the piston body and
seal over the piston rod without
118
MA 41
piston rod seal with asymmetrical seal
than 45°. There is a second seal edge
on the inner diameter and the seal unit
has an integrated support ring.
Standard materials
Polyurethane AU 92
Area of application
Hydraulics
extreme loads
Function
rod seal in the form of a U-ring. Its
excellent suitability for extreme loads,
which is for example required for
application in the working cylinders
of heavy earth-moving machines, is
provided by the synergy between the
geometric of this seal and the special
material characteristics of polyurethane.
It guarantees effective sealing at low
or fabric seals. The second seal lip
supports the sealing function on the
upward stroke of the rod and also wipes
remaining dirt from the atmospheric side
on the downward stroke of the rod. The
semi-active support ring on the inner
diameter protects against fission extrusion.
Media
VDMA 24317
Temperature (° C): – 40 to +100
Running speed (m/s): <0.5
the piston rod without damaging it, an
table is required:
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
The service life of the seal is lengthened
if the housing is provided with a metallic
fitting on the side opposite the pressure.
the cylinder head and piston rod acc.
to the following table:
Pressure (MPa)
5
10
20
30
40
Radial wedge G (mm)
1.0
0.8
0.6
0.5
0.4
Remarks
and although also available at short notice,
may be subject to minimum purchasing
quantities.
applications, further polyurethane
Installation
tensile resistance of polyurethane, it is
necessary to use installation tools for
accessible housing.
126
MA 36
symmetrical seal lips which are
cut at an angle of less than 45°.
Standard material
Polyurethane AU 92
Area of application
Hydraulics
Function
rod seal in the form of a compact U-ring
which, due to its symmetrical seal lips,
can be applied as a piston and piston
rod seal. Its sealing function is very
effective as the seal lips are provided
with radial self-energising which is
activated by the system pressure. Its
compact design and the excellent
material characteristics of polyurethane
guarantee effective sealing on the one
hand at low as well as high pressure
loads and, on the other, a particularly
long service life.
Media
VDMA 24317
Installation
25 mm and a thin profile, can always
high tensile resistance of polyurethane,
accessible housing.
the piston rod or push the piston rod with
the seal into the cylinder rod without
damaging the seal, an lead-in chamfer
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
Pressure (MPa)
5
10
20
30
40
Radial wedge G (mm)
0.6
0.5
0.35
0.3
0.25
Remarks
short notice, may be subject to minimum
purchasing quantities.
128
MA 35
piston rod seal with symmetrical seal
than 45°. There is a second seal lip
on the inner diameter.
Standard material
Polyurethane AU 92
Area of application
Hydraulics
Function
rod seal in the form of a compact U-ring.
Its design and the excellent material
characteristics of polyurethane guarantee
effective sealing at low and zero
pressures as well as high pressure loads
and a particularly long service life. Due
to the second seal lip which provides
even greater effectivity of the sealing
function, it is particularly well-suited for
positioning work in hydraulics.
Media
VDMA 24317
Installation
it is necessary to use installation tools
for thick seals. With an inner diameter
of less than 25 mm, we recommend
axially accessible housing.
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
Pressure (MPa)
5
10
20
30
40
Radial wedge G (mm)
0.6
0.5
0.35
0.3
0.25
Remarks
table is required:
132
MA 37
symmetrical seal lips which are cut at an
angle of less than 45°. There is a second
seal lip on the inner diameter and the
seal unit has an integrated support ring.
Standard materials
Polyurethane AU 92
Area of application
Hydraulics
Function
rod seal in the form of a compact U-ring.
The symmetrical seal lips and the
excellent material characteristics of
polyurethane guarantee effective sealing
at low and zero pressures as well as high
pressure loads and a particularly long
service life. Due to the second seal lip
which provides even greater effectiveness
of the sealing function, it is particularly
well-suited for positioning work in
hydraulics. The semi-active support ring
on the inner diameter protects against
fission extrusion.
Media
VDMA 24317
Installation
tensile resistance of polyurethane, it is
necessary to use installation tools for
accessible housing.
table is required:
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
Pressure (MPa)
5
10
20
30
40
Radial wedge G (mm)
1.0
0.8
0.6
0.5
0.4
Remarks
138
MA 42
symmetrical seal lips which are cut at an
angle of less than 45°. An energising
element is integrated in the seal lip area.
Standard materials
Polyurethane AU 92
NBR 70
Area of application
Hydraulics
high loads
Function
rod seal in the form of a compact U-ring
which, due to its symmetrical seal lips,
can be used as a piston and piston rod
seal. Its excellent suitability for extreme
loads is provided by the synergy between
the geometric of this seal and the special
material characteristics of polyurethane.
It guarantees effective sealing at low
or fabric seals.
Media
VDMA 24317
Installation
accessible housing.
the piston rod or the the piston rod and
seal into the cylinder without damaging
the seal, an lead-in chamfer C acc. to
the following table is required:
4
2
5
2.5
7.5
4
10
5
12.5
6.5
15
7.5
20
10
25
10
Remarks
140
MA 43
piston rod seal with a V-spring
as an energising element
Media
All types of hydraulic oils,
hot air, steam and most chemicals
Standard materials
PTFE/carbon compound D 31
non-corrosive, acid-resistant steel
1.4310
Running speed (m/s): up to 15
Area of application
All areas of general mechanical
and apparatus engineering,
chemical engineering and process
technology,
hydraulics and pneumatics,
Installation
We generally recommend split seal
housing. In a limited range, half-open
or closed housing is also possible.
instructions on page 12 of this catalogue
or ask our advice.
Function
rod seal in the form of a U-ring with
seal lips of varying design. These
achieve optimal sealing strength and
reduce friction. This results in the seal
having an exceptionally long service life.
The metal spring permanently activates
the seal lips which guarantees zero
leakage even in an unpressurized state.
As a result of the exceptionally positive
material characteristics of PTFE, there
is no stick slip movement of the rod at
differing stroke speeds, even during a
single cycle and with extremely slight
movements. Total lack of leakage with
regard to media viscosity and its
hydrodynamic dragging behaviour as
well as dependable functioning in high
temperature, speed and pressure areas
characterise these seals. They are used
as piston rod seals in hydraulics and
pneumatics.
Remarks
or can be delivered at short notice. In
addition, we are able to produce any
applications, further PTFE compounds
and V springs made of ELGILOY ® are
available. The use of PTFE compounds
in the pharmaceutical and foodstuffs
industries is completely harmless.
However, in this case, the spring housing
of the seal should be filled completely
with a flexible silicone casting compound
so that a smooth surface is formed.
Please mention this application when
placing your orders.
L
Ra ≤ 3mm
R
Ra ≤ 1,6mm 1/2 G
20°
Ra ≤ 0,3mm
max R = 0,2
Cmin = 0,8xL
øD ød
rounded
152
MA 44
Media
All types of hydraulic oils, hot air,
steam and most chemicals
piston seal with a V-spring
as an energising element
Standard materials
PTFE/carbon compound D 31
non-corrosive, acid-resistant steel
1.4310
Temperature (° C): –150 to +250
Running speed (m/s): up to 15
Area of application
All areas of general mechanical
and apparatus engineering,
chemical engineering and process
technology,
hydraulics and pneumatics,
Installation
We generally recommend split seal
housing. In a limited range, half-open
or closed housing is also possible.
instructions on page 12 of this catalogue
or ask our advice.
Function
seal in the form of a U-ring with seal
lips of varying design. These achieve
optimal sealing strength and reduce
friction. This results in the seal having
an exceptionally long service life. The
metal spring permanently activates the
seal lips which guarantees zero leakage
even in an unpressurized state. As a
result of the exceptionally positive
material characteristics of PTFE, there is
no stick slip movement of the piston at
differing stroke speeds, even during a
single cycle and with extremely slight
movements. Total lack of leakage with
regard to media viscosity and its
hydrodynamic dragging behaviour as
well as dependable functioning in high
temperature, speed and pressure areas
characterise these seals. They are used
as piston seals in hydraulics and
pneumatics.
Remarks
or can be delivered at short notice.
applications, further PTFE compounds
and V springs made of ELGILOY are
available. The use of PTFE compounds
in the pharmaceutical and foodstuffs
industries is completely harmless.
However, in this case, the spring housing
of the seal should be filled completely
with a flexible silicone casting compound
so that a smooth surface is formed. Please
mention this application when placing
your orders.
L
Ra ≤ 3mm
max R = 0,2
1/2 G
20°
Ra ≤ 0,3mm
Ra ≤ 1,6mm
Cmin = 0,8xL
R
rounded
ød
øD
156
Germany
DICHTOMATIK GMBH
France
DICHTOMATIK S.A.S.
Albert-Schweitzer-Ring 1
D-22045 Hamburg
P.O.Box 70 04 80
D-22004 Hamburg
Phone +49/40 /66 98 90
Fax +49/40 /66 98 91 01
[email protected]
www.dichtomatik.de
Espace Entreprises
Mâcon Loché TGV
F-71000 Loché
Phone 03/85 27 02 80
Fax 03/85 35 69 37
[email protected]
www.dichtomatik.fr
The Netherlands
DICHTOMATIK B.V.
Benjamin Franklinstraat 6
NL-8013 NC Zwolle
Postbus 40 102
NL-8004 DC Zwolle
Phone 038 /460 16 06
Fax 038 /467 19 00
[email protected]
www.dichtomatik.nl
Great Britain
DICHTOMATIK LIMITED
Donington House
Riverside Road
Pride Park
GB-Derby DE24 8HX
Phone 01332 /52 44 00
Fax 01332 /52 44 04
[email protected]
www.dichtomatik.co.uk
Austria
DICHTOMATIK HANDELSGES. MBH
Rautenweg 17
A-1220 Wien
Phone 01/259 35 41
Fax 01/259 35 41 31
[email protected]
www.dichtomatik.co.at
Sweden
DICHTOMATIK AB
Hjalmar Brantings Väg 25
S-26143 Landskrona
Box 142
S-26122 Landskrona
Phone 0418 /44 98 00
Fax 0418 /44 98 20
[email protected]
www.dichtomatik.se
Italy
DICHTOMATIK S.R.L.
Via Delle Fabbriche 6
I-16158 Genova-Voltri
Phone 010 /612 75
Fax 010 /613 38 61
[email protected]
www.dichtomatik.it
Hungary
DICHTOMATIK KFT.
Üllöi Ut 288
H-1184 Budapest
Phone 01/297 43 45
Fax 01/297 02 18
[email protected]
www.dichtomatik.de
USA
DICHTOMATIK
NORTH AMERICA
1087 Park Place
Shakopee
Minnesota 55379
Phone 952/894 84 00
Fax 952/894 15 88
[email protected]
www.dichtomatik.us
Canada
DICHTOMATIK
NORTH AMERICA
950 Denison Steet Unit 21
Markham
Ontario L3R3K5
Phone 905/470 22 66
Fax 905/470 20 55
[email protected]
www.dichtomatik.ca
The technical details in this catalogue
are based on experience and standart
tests repeated in quality assurance and
are to be seen as general and nonbinding approximate values which may
well vary up or down. We therefore
recommend that you consult our
technical department for concrete cases
in which limits may be reached.
The catalogue details may be altered
without notice. Upon the publication of
a new catalogue, previous editions
cease to be valid.
3.05.7
Reproduction in any form requires the
express consent of Dichtomatik GmbH.

dichtomatik

Transcription

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