Merkel u ring-seal_set_0216

© Merkel Freudenberg Fluidtechnic GmbH | Seals for Fluid Power Catalog 2007

Hydraulics | Rod Seals | Merkel U-Ring Seal Set 0216

Merkel U-Ring Seal Set 0216

NBR U-ring

Backring

Fabric

Fig. 1 Merkel U-Ring Seal Set 0216

Product description

Two-piece Merkel seal set comprising an elastomer U-ring with an elastomer sealing edge, fabric reinforcement on the contact area and an active back-up ring. Merkel U-Ring Seal Set 0216 can also be used for pneumatic applications.

Product advantages

Single-acting rod seal for use in hydrau-lics and pneumatics

Low friction due to fabric partLarge range of dimensionseProtection against extrusion through activated back-up ringLow deformation value (not suitable for sealing systems)Easily installed in non-axial housings From 100 mm diameter.

Application

Pneumatic applications.

Material

U-ring

Material Code

NBR 80 NBR B246

Cotton fabric BI-NBR B4 B248

Back-up ring

D Material Code

<300 mm Polyacetal POM POM PO202

>300 mm Polyamide PA 6.G200

Other materials like PTFE bronze back-up ring on enquiry.

Operating conditions

Material80 NBR B246/BI-NBR B4B248/

POM PO20280 NBR B246/BI-NBR B4B248/

PA 6.G200

Temperature range in °C

Hydraulic oils HL, HLP –30 … +100 –30 … +100

HFA fluids +5 … +60 +5 … +60

HFB fluids +5 … +60 +5 … +60

HFC fluids –30 … +60 –30 … +60

HFD fluids – –

Water +5 … +100 +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 Hydraulic 25 or 40*

Pressure p in MPa Pneumatic 5

Running speed v in m/s 1,5

* max. pressure depends on the profile

For Merkel U-Ring Seal Sets 0216, if long strokes are traversed, the max. pressure should only be applied to the last part of the stroke (closing pressure); during the stroke max. 16 MPa.

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%.

Merkel U-Ring Seal Set 0216


Design notes

Please observe our general design notes in → Technical Manual.

Gap dimension X2The decisive factor for the function of the seal is the largest gap dimension occurring during operation on the non-pressurised side of the seal. → Technical Manual.

Profile 16 MPa 26 MPa 32 MPa 40 MPa

D d X2 D d X2 D d X2 D d X2

<15 H10 f7 1,2 H10 f7 1,0 H10 f7 0,65 H10 f7 0,5

>15 H10 f7 1,8 H10 f7 1,4 H10 f7 0,90 H10 f7 0,7

The dimensions D1 and DF are to be viewed in connection with the sealing component used.

Tolerance recommendationThe admissible gap width, tolerances, guide play and deflection of the guide under load are to be taken into account when designing d2. → Technical Manual.

Fitting & installation

Careful fitting is a prerequisite for the correct function of the seal. → Technical Manual.




Article list

H

C

20°

DØ dØ

L+0, 2

R1 0, 4

D2Ø

d D H L Profile C Material Article No.

125 155 18 19 15 7,5 80 NBR B246 24291122 D D

140 170 18 19 15 7,5 80 NBR B246 24314111 D D

170 200 22 23 15 7,5 80 NBR B246 24275197 D D

180 210 18 19 15 7,5 80 NBR B246 24245114 D D

200 230 22 23 15 7,5 80 NBR B246 24290483 D D

210 240 22 23 15 7,5 80 NBR B246 24275209 D D

250 280 22 23 15 7,5 80 NBR B246 24269898 D D

260 290 22 23 15 7,5 80 NBR B246 24316621 D D

270 300 22 23 15 7,5 80 NBR B246 24266414 D D

280 310 22 23 15 7,5 80 NBR B246 24269899 D D

300 330 22 23 15 7,5 80 NBR B246 24245117 D D

320 350 22 23 15 7,5 80 NBR B246 24269900 D D

320 360 30 32 20 10 80 NBR B246 24248351 D D

350 380 25 26 15 7,5 80 NBR B246 24250321 D D

360 400 30 32 20 10 80 NBR B246 24290064 D D

370 400 25 26 15 7,5 80 NBR B246 24310655 D D

380 420 30 32 20 10 80 NBR B246 24275210 D D

390 420 25 26,5 15 7,5 80 NBR B246 24289372 D D

400 430 22 23 15 7,5 80 NBR B246 24308105 D D

420 450 25 26,5 15 7,5 80 NBR B246 24299741 D D

450 480 25 26 15 7,5 80 NBR B246 24274570 D D

450 490 30 32 20 10 80 NBR B246 24228307 D D

475 515 30 32 20 10 80 NBR B246 24234174 D D

480 520 30 32 20 10 80 NBR B246 24232822 D D

500 530 25 26,5 15 7,5 80 NBR B246 24289342 D D

530 560 25 26,5 15 7,5 80 NBR B246 24293086 D D

540 580 30 32 20 10 80 NBR B246 24288874 D D

560 600 25 26 20 10 80 NBR B246 24287008 D D

580 620 30 32 20 10 80 NBR B246 24234580 D D

600 630 25 26 15 7,5 80 NBR B246 24275198 D D

600 640 30 32 20 10 80 NBR B246 24237292 D D

670 710 25 26,5 20 10 80 NBR B246 24293600 D D

720 760 30 32 20 10 80 NBR B246 24361403 D D

800 850 32 34 25 12,5 80 NBR B246 24361423 D D

850 890 30 32 20 10 80 NBR B246 24311336 D D

890 920 25 26 15 12,5 80 NBR B246 24345895 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


d D H L Profile C Material Article No.

975 1025 37,5 40 25 12,5 80 NBR B246 24361424 D D

1000 1050 37,5 40 25 12,5 80 NBR B246 24293083 D D

1070 1120 31 33 25 12,5 80 NBR B246 24361426 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 u ring-seal_set_0216