Merkel omegat omk-e_01

© 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 pressureDesign prevents twistingVery good protection against extru-sionHigh resistance to abrasionGood thermal conductivityLow friction, free of stick-slipHigh 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

MaterialPTFE B602/

80 NBR B246PTFE 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



Gap dimensionThe 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 d2The 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 dNominal

Ø DD d

Nominal Ø D

D dNominal

Ø DD 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.



Article list

dFØ

dF1Ø

d2Ø DØdØ

R1

H

C

20°

L +0,2 Rounded and free of burrsRounded and free of burrs R2 < 0,2

D d H L Profile C R 1 Material Article No.

110 90 9,4 10 10 7,5 0,4 PTFE GM201 24351403 D D

120 100 9,4 10 10 7,5 0,4 PTFE GM201 24380258 D D

125 105 9,4 10 10 7,5 0,4 PTFE GM201 24351404 D D

125 105 9,4 10 10 7,5 0,4 PTFE B602 49000473 D D

130 110 9,4 10 10 7,5 0,4 PTFE GM201 531548 D D

140 120 9,4 10 10 7,5 0,4 PTFE GM201 24351116 D D

160 135 11,7 12,5 12,5 10 0,4 PTFE GM201 24351168 D D

170 145 11,7 12,5 12,5 10 0,4 PTFE GM201 526064 D D

170 145 11,7 12,5 12,5 10 0,4 PTFE B602 24339183 D D

180 155 11,7 12,5 12,5 10 0,4 PTFE B602 24298561 D D

200 175 11,7 12,5 12,5 10 0,4 PTFE GM201 24380283 D D

210 185 11,7 12,5 12,5 10 0,4 PTFE GM201 24351170 D D

260 230 14 15 15 12 0,8 PTFE GM201 24227066 D D

260 230 14 15 15 12 0,8 PTFE B602 24378105 D D

280 250 14 15 15 12 0,8 PTFE GM201 24265687 D D

280 250 14 15 15 12 0,8 PTFE B602 24339180 D D

300 270 14 15 15 12 0,8 PTFE GM201 24209307 D D

300 270 14 15 15 12 0,8 PTFE B602 24339181 B B

320 290 14 15 15 12 0,8 PTFE GM201 24265690 D D

320 290 14 15 15 12 0,8 PTFE B602 24339182 D D

330 300 14 15 15 12 0,8 PTFE B602 24339186 D D

340 310 14 15 15 12 0,8 PTFE B602 24353070 D D

350 320 14 15 15 12 0,8 PTFE GM201 24248305 D D

380 350 14 15 15 12 0,8 PTFE GM201 526957 D D

410 375 16,4 17,5 17,5 12 1,2 PTFE GM201 24213829 D D

500 465 16,4 17,5 17,5 12 1,2 PTFE B602 24346901 D D

500 465 16,4 17,5 17,5 12 1,2 PTFE GM201 49013401 D D

520 485 16,4 17,5 17,5 12 1,2 PTFE GM201 24357903 D D

550 515 16,4 17,5 17,5 12 1,2 PTFE GM201 24372694 D D

600 565 16,4 17,5 17,5 12 1,2 PTFE B602 24338042 D D

620 585 16,4 17,5 17,5 12 1,2 PTFE GM201 530238 D D

660 625 16,4 17,5 17,5 12 1,2 PTFE B602 24291575 D D

720 685 16,4 17,5 17,5 12 1,2 PTFE GM201 24213578 D D

740 705 16,4 17,5 17,5 12 1,2 PTFE GM201 24378497 D D

750 710 18,7 20 20 12 1,2 PTFE GM201 49011384 D D

B B Available from stock Available from stock D D On request: Tool is available, delivery at short notice On request: Tool is available, delivery at short notice


Merkel FreudenbergFluidtechnic GmbHIndustriestr. 64D-21107 HamburgTel.: +49(0)40/75 30 6-0Fax: +49(0)40/75 30 6-440E-mail: [email protected]

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 specifi c application – it depends signifi cantly 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 infl uence 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 specifi c 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.

Devices & Hardware

Merkel omegat omk-e_01