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
Hydraulics | Piston Seals | Merkel Omegat OMK-ES
Merkel Omegat OMK-ES
Elastomer profile ring
PTFE profile ring
Fig. 1 Merkel Omegat OMK-ES
Product description
Two-piece Merkel seal set for sealing
pistons, consisting of one PTFE profile
ring and an elastomer profile ring as a
pre-load component.
Product advantages
The Merkel Omegat OMK-ES is for use
where sealing pistons have pressure on
one side. The Merkel Omegat OMK-ES
series is designed especially for large
diameters and for heavy duty hydraulic
applications
Very high resistance to pressure
Design prevents twisting
Very good protection against extru-
sion
High resistance to abrasion
Good thermal conductivity
Low friction, free of stick-slip
High contact pressure due to elas-
tomer profile ring.
Application
Injection moulding machines, presses,
marine hydraulics, manipulators, mills,
steel hydraulics engineering, large
cylinders.
Material
PTFE profile ring
Material Code
PTFE bronze compound PTFE B602
PTFE glass MoS2 compound PTFE GM201
Elastomer profile ring
Material Code Hardness
Nitrile rubber NBR 80 NBR B246 80 Shore A
Other materials are available on request.
Operating conditions
Material
PTFE B602/
80 NBR B246
PTFE GM201/
80 NBR B246
Temperature range in °C
Hydraulic oils HL, HLP –30 … +100 –30 … +100
HFA fluids – +5 … +60
HFB fluids – +5 … +60
HFC fluids – –30 … +60
HFD fluids – –
Water – +5 … +100
HETG (rapeseed oil) –30 … +80 –30 … +80
HEES (synthetic esters) –30 … +80 –30 … +80
HEPG (glycol) –30 … +60 –30 … +60
Mineral greases –30 … +100 –30 … +100
Pressure p in MPa 40
Running speed v in m/s 5
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
Percentage contact area Mr >50% to max. 90% at cutting depth c = Rz/2 and reference line C ref = 0%.
Design notes
Please observe our general design notes in → Technical Manual.
Merkel Omegat OMK-ES

2. © Merkel Freudenberg Fluidtechnic GmbH | Seals for Fluid Power Catalog 2007
Hydraulics | Piston Seals | Merkel Omegat OMK-ES
Gap dimension
The largest gap dimension occurring on the non-pressurised side of the seal in opera-
tion is of vital importance for the function of the seal. → Technical Manual.
Profile Max. permissible gap dimension
L Profile 16 MPa 26 MPa 32 MPa 40 MPa
10,0 10,0 0,60 0,50 0,40 0,40
12,5 12,5 0,75 0,65 0,55 0,50
15,0 15,0 0,75 0,65 0,55 0,50
17,5 17,5 0,75 0,65 0,55 0,50
20,0 20,0 0,80 0,70 0,60 0,55
Tolerance recommendation and dimension d2
The admissible gap width, tolerances, guide play and deflection of the guide under
load are to be taken into account when designing d2. → Technical Manual.
16 MPa 26 MPa 32 MPa 40 MPa
Nominal
Ø D
D d
Nominal
Ø D
D d
Nominal
Ø D
D d
Nominal
Ø D
D d
100 … 500 H8 h8 100 … 500 H8 h8 100 … 500 H8 h8 100 … 500 H8 h8
>500 … 1000 H8 h8 >500 … 1000 H8 h8 >500 … 1000 H8 h8 >500 … 1000 H7 h7
Fitting & installation
Careful fitting is a prerequisite for the correct function of the seal.
→ Technical Manual.

3. © Merkel Freudenberg Fluidtechnic GmbH | Seals for Fluid Power Catalog 2007
Hydraulics | Piston Seals | Merkel Omegat OMK-ES
Article list
dFØ
dF1Ø
d2Ø DØdØ
R1
H
C
20°
L+0,2
Rounded and free of burrsRounded and free of burrs R
2
< 0,2
D d H L Profile C R1 Material Article No.
110 90 9,4 10 10 7,5 0,4 PTFE GM201 24351403 DD
120 100 9,4 10 10 7,5 0,4 PTFE GM201 24380258 DD
125 105 9,4 10 10 7,5 0,4 PTFE GM201 24351404 DD
125 105 9,4 10 10 7,5 0,4 PTFE B602 49000473 DD
130 110 9,4 10 10 7,5 0,4 PTFE GM201 531548 DD
140 120 9,4 10 10 7,5 0,4 PTFE GM201 24351116 DD
160 135 11,7 12,5 12,5 10 0,4 PTFE GM201 24351168 DD
170 145 11,7 12,5 12,5 10 0,4 PTFE GM201 526064 DD
170 145 11,7 12,5 12,5 10 0,4 PTFE B602 24339183 DD
180 155 11,7 12,5 12,5 10 0,4 PTFE B602 24298561 DD
200 175 11,7 12,5 12,5 10 0,4 PTFE GM201 24380283 DD
210 185 11,7 12,5 12,5 10 0,4 PTFE GM201 24351170 DD
260 230 14 15 15 12 0,8 PTFE GM201 24227066 DD
260 230 14 15 15 12 0,8 PTFE B602 24378105 DD
280 250 14 15 15 12 0,8 PTFE GM201 24265687 DD
280 250 14 15 15 12 0,8 PTFE B602 24339180 DD
300 270 14 15 15 12 0,8 PTFE GM201 24209307 DD
300 270 14 15 15 12 0,8 PTFE B602 24339181 BB
320 290 14 15 15 12 0,8 PTFE GM201 24265690 DD
320 290 14 15 15 12 0,8 PTFE B602 24339182 DD
330 300 14 15 15 12 0,8 PTFE B602 24339186 DD
340 310 14 15 15 12 0,8 PTFE B602 24353070 DD
350 320 14 15 15 12 0,8 PTFE GM201 24248305 DD
380 350 14 15 15 12 0,8 PTFE GM201 526957 DD
410 375 16,4 17,5 17,5 12 1,2 PTFE GM201 24213829 DD
500 465 16,4 17,5 17,5 12 1,2 PTFE B602 24346901 DD
500 465 16,4 17,5 17,5 12 1,2 PTFE GM201 49013401 DD
520 485 16,4 17,5 17,5 12 1,2 PTFE GM201 24357903 DD
550 515 16,4 17,5 17,5 12 1,2 PTFE GM201 24372694 DD
600 565 16,4 17,5 17,5 12 1,2 PTFE B602 24338042 DD
620 585 16,4 17,5 17,5 12 1,2 PTFE GM201 530238 DD
660 625 16,4 17,5 17,5 12 1,2 PTFE B602 24291575 DD
720 685 16,4 17,5 17,5 12 1,2 PTFE GM201 24213578 DD
740 705 16,4 17,5 17,5 12 1,2 PTFE GM201 24378497 DD
750 710 18,7 20 20 12 1,2 PTFE GM201 49011384 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

4. © 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.