Walle produce all series of hydraulic seals,according to category by purpose,including rotary seals, all kinds of O ring(FKM O ring), step seal, glyd ring, oil seal and various of combination seals, gasket, spring energised seals, food machinery seals and so on.

1. © Merkel Freudenberg Fluidtechnic GmbH | Seals for Fluid Power Catalog 2007
Seals for Swivelling Movement | Merkel Rotomatic M 19
Merkel Rotomatic M 19
Fabric block
Backup ring
Elastomer component
Fig. 1 Merkel Rotomatic M 19
Product description
Three-part Merkel seal set, consisting of
an elastomer part with fabric reinforce-
ment on the contact area which is formed
so that two sealing edges form an oil
groove, as well as two activated back-up
rings.
Product advantages
Double-acting rod seal for pivoting mo-
tions in hydraulic systems, preferably for
usage in hydraulic joints and rotary joints
Extrusion-secured through activated
back-up ring
Wear-resistant.
Application
Excavators, grippers, rotary joints.
Material
Material Code
Nitrile rubber NBR/POM 80 NBR B246/BI-NBR B4 B285/POM PO202
Operating conditions
Material 80 NBR B246/BI-NBR B4 B285/POM PO202
Temperature range in °C
Hydraulic oils HL, HLP –30 … +80
HFA fluids +5 … +60
HFB fluids +5 … +60
HFC fluids –30 … +60
HFD fluids –
Water +5 … +80
HETG (rapeseed oil) –30 … +80
HEES (synthetic ester) –30 … +80
HEPG (glycol) –30 … +60
Mineral greases –30 … +80
Pressure p in MPa 40
Running speed v in m/s 0,2
If the seal set is to be used for permanent rotational movement, please consult us first.
Surface quality
Surface roughness Ra Rmax
Sliding surface 0,05 … 0,3 µm ≤2,5 µm
Groove base ≤1,6 µm ≤6,3 µm
Groove flanks ≤3,0 µm ≤15,0 µm
The surface hardness must be approx. 45 to 60 HRC (depth of hardening min. 0,5 mm). Percentage contact area Mr >50%
to max 90% at cutting depth c = Rz/2 and reference line C ref = 0%. Abrasive surfaces, ridges, scratches and blow-holes
are to be avoided.
Design notes
Please observe our general design notes in → Technical Manual.
Tolerance recommendation and dimension d2
Recommended fit for pressures up to 40 MPa
Profile D2
Tolerance
level D2
Shaft Groove base
7,5
d +0,2*
d +0,3
H8 f8 H9
10,0
d +0,3*
d +0,5
H8 f8 H9
12,5
d +0,5*
d +0,7
H8 f8 H9
* In dependence on the H dimension of the back-up ring.
Merkel Rotomatic M 19

2. © Merkel Freudenberg Fluidtechnic GmbH | Seals for Fluid Power Catalog 2007
Seals for Swivelling Movement | Merkel Rotomatic M 19
Article list
H
DØ d h9
Ø
20°
C D2
Ø
L
+0,2
R1 0,5
rounded and burr-free
rounded and burr-free
d D L C Profile Material Article No.
60 72 10 5,5 6 80 NBR B246 24069210 DD
70 85 11 5,5 7,5 80 NBR B246 24067432 DD
80 95 11 5,5 7,5 80 NBR B246 24235577 BB
90 110 13 7,5 10 80 NBR B246 24103500 DD
95 112 10,8 7 8,5 80 NBR B246 24308835 DD
95 112 11 7 8,5 80 NBR B246 24065060 BB
100 120 13 7,5 10 80 NBR B246 24103501 DD
110 130 13 7,5 10 80 NBR B246 24103502 BB
125 145 13 7,5 10 80 NBR B246 24103504 BB
130 150 11 7,5 10 80 NBR B246 24091083 BB
140 160 13 7,5 10 80 NBR B246 24103505 DD
150 170 13 7,5 10 80 NBR B246 24139281 DD
160 185 16 8 12,5 80 NBR B219 24080888 DD
180 205 16 8 12,5 80 NBR B246 24068319 DD
200 225 16 8 12,5 80 NBR B219 24103506 DD
290 320 19 8 15 80 NBR B246 24195361 DD
365 390 16 8 12,5 80 NBR B246 24362038 DD
BB Available from stockAvailable from stock DD On request: Tool is available, delivery at short noticeOn request: Tool is available, delivery at short notice

3. © Merkel Freudenberg Fluidtechnic GmbH | Seals for Fluid Power Catalog 2007
Merkel Freudenberg
Fluidtechnic GmbH
Industriestr. 64
D-21107 Hamburg
Tel.: +49(0)40/75 30 6-0
Fax: +49(0)40/75 30 6-440
E-mail: merkel@freudenberg.de
www.merkel-freudenberg.de
The catalog details are based on the
experience of many years of research
in the development and production of
seals in the Freudenberg Group and
correspond to our current level of know-
how.
The sealing action of many catalog
products is, however, not only created
by the component itself. In many
cases – depending on the specific
application – it depends significantly on
the other parameters, such as installa-
tion point, counter surface, pressure,
operating temperature, media to be
sealed, lubrication, effects of vibration
and any ingress of dirt from outside.
These and other unknown factors in
practical use may noticeably influence
the functioning of the seals. Against this
background generalised statements
on the function of the catalog products
are not possible. Details in this catalog
merely represent general and non-bin-
ding reference values which make no
claim to be valid for every application.
We therefore recommend you to always
discuss specific applications with our
consultancy service. In the event of very
high and special loads, for example due
to aggressive media, the seal should be
selected in co-operation with us; trials to
check the functional reliability are often
indispensable.