Merkel u ring-tm-23

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

Hydraulics | Rod Seals | Merkel U-Ring TM 23

Merkel U-Ring TM 23

PUR profile ring

Back-up ring

Additional sealing, support edge

Fig. 1 Merkel U-Ring TM 23

Product description

The Merkel U-Ring TM 23 is specially designed for sealing the piston rods of plungers, pushers and subsidiary cylin-ders in self-advancing support systems.

Product advantages

To meet the requirements of a higher ra-dial deflection and larger gap bridging, the Merkel U-Ring TM 23 has been fitted with an increased pre-load and active back-up ring. The second sealing edge provides extra protection against the ingress of dirt particles.

Good media resistanceVery good static and dynamic tightnessLarge range of dimensionsBridges large gapsHighly wear-resistant.

Application

Mining.

Material

Material Code Hardness

Novathan (polyurethane) 95 AU V157/ 93 AU V167 95 Shore A/93 Shore A

Operating conditions

Material 95 AU V157/ 93 AU V167

Temperature range in °C

HFA fluids/water +5 … +60

Pressure p in MPa 50

Running speed v in m/s <0,1*

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% up to max. 90% at cutting depth c = Rz/2 and reference line C ref = 0%.

Recommended profile

d S L

<60 6,0 9,6

60 … 120 7,5 12,5

120 … 200 10,0 16,0

200 … 300 12,5 20,0

>300 15,0 22,0

Other dimensions are possible. Please ask.

Merkel U-Ring TM 23


Design notes

Please observe our general design notes in → Technical Manual.

Gap dimensionThe 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 Max. permissible gap dimension

L Profile 16 MPa 26 MPa 32 MPa 50 MPa

12,5 7,5 0,8 0,7 0,50 0,4

>12,5 … 16,0 >7,5 … 10,0 1,2 1,0 0,65 0,5

>16,0 >10,0 1,8 1,4 0,90 0,7

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.

Nominal Ø d d D

≤350 f7 H10

Fitting & installation

The U-rings can be fitted into plunge-cut grooves by hand or with a fitting tool. We will be pleased to send you a design drawing for this on enquiry.




Article list

H

C

30°

DØ dØ

L+0, 2

R1 0, 4

D2Ø

d D H L Profile C Material Article No.

60 72 11,4 13 6 6 95 AU V157 24301853 D D

70 85 11,4 13 7,5 7 95 AU V157 24296870 D D

80 92 10,9 12 6 6 95 AU V157 24301858 D D

80 95 14,6 16 7,5 7 95 AU V157 24309920 D D

85 100 11,4 13 7,5 7 93 AU V167 24359397 D D

90 110 14,6 16 10 8,5 95 AU V157 24296871 D D

95 110 11,4 13 7,5 7 95 AU V157 24328307 D D

100 115 10,5 12 7,5 7 95 AU V157 24315670 D D

100 115 14,6 16 7,5 7 95 AU V157 24268764 D D

110 125 14,6 16 7,5 7 95 AU V157 24313031 D D

110 130 14,6 16 10 8,5 95 AU V157 24296872 D D

120 135 11,4 13 7,5 7 95 AU V157 24296681 D D

120 135 14,6 16 7,5 7 95 AU V157 24313025 D D

125 140 11,4 13 7,5 7 95 AU V157 24294247 D D

135 155 14,6 16 10 8,5 93 AU V167 24369133 D D

140 160 14,6 16 10 8,5 95 AU V157 24265472 D D

145 162 14,6 16 8,5 8 95 AU V157 24372351 D D

145 165 16 17,5 7,5 8,5 93 AU V167 24354392 D D

149 165 18,2 20 8 7 95 AU V157 24299881 D D

150 165 14,6 16 7,5 7 95 AU V157 24313029 D D

150 168 19,1 21 9 8 95 AU V157 24328308 D D

155 170 14,6 16 7,5 7 95 AU V157 24313030 D D

155 175 14,6 16 10 8,5 95 AU V157 24268763 D D

160 175 14,6 16 7,5 7 95 AU V157 24308961 D D

165 180 11,4 13 7,5 7 95 AU V157 24309919 D D

165 182 11,4 13 8,5 8 95 AU V157 24315950 D D

165 182 14,6 16 8,5 8 93 AU V167 24366938 D D

170 185 14,6 16 7,5 7 95 AU V157 24292396 D D

170 190 14,6 16 10 8,5 95 AU V157 24338291 D D

180 195 11,4 16 7,5 7 95 AU V157 24296682 D D

180 195 14,6 16 7,5 7 95 AU V157 24299882 D D

180 200 14,6 16 10 8,5 93 AU V167 24374346 D D

180 200 19,1 21 10 8,5 95 AU V157 24293702 D D

185 200 20,6 23 7,5 7 93 AU V167 24374555 D D

185 210 18,2 20 12,5 7 95 AU V157 24314005 D D

185 214 18,2 20 14,5 11 95 AU V157 24299628 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.

190 210 14,6 16 10 8,5 95 AU V157 24265473 D D

195 210 14,6 16 7,5 7 93 AU V167 24356464 D D

195 215 14,6 16 10 8,5 93 AU V167 24366936 D D

205 220 14,6 16 7,5 7 95 AU V157 24313032 D D

205 225 14,6 16 10 8,5 95 AU V157 24327442 D D

210 230 14,6 16 10 8,5 93 AU V167 24358106 D D

210 235 18,2 20 12,5 9,5 95 AU V157 24263447 D D

220 235 14,6 16 7,5 7 95 AU V157 24262955 D D

222 237 20,2 23 7,5 7 95 AU V157 24337054 D D

225 250 18,2 20 12,5 9,5 93 AU V167 24366939 D D

230 255 22,8 25 12,5 9,5 95 AU V157 24293703 D D

235 255 14,6 16 10 8,5 95 AU V157 24299884 D D

245 270 18,2 20 12,5 9,5 95 AU V157 24314006 D D

260 280 16,6 18 10 8,5 93 AU V167 24374345 D D

265 294 20 22 14,5 11 95 AU V157 24299629 D D

275 300 18,2 20 12,5 9,5 95 AU V157 24265474 D D

285 310 18,2 20 12,5 9,5 95 AU V157 24380148 D D

290 315 18,2 20 12,5 9,5 95 AU V157 24316205 D D

305 330 18,2 20 12,5 9,5 93 AU V167 24263445 D D

325 355 20 22 15 8 93 AU V167 24359407 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-tm-23