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 | 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 resistance
Very good static and dynamic
tightness
Large range of dimensions
Bridges large gaps
Highly 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

2. © Merkel Freudenberg Fluidtechnic GmbH | Seals for Fluid Power Catalog 2007
Design notes
Please observe our general design notes in → Technical Manual.
Gap dimension
The 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 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.
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.
Hydraulics | Rod Seals | Merkel U-Ring TM 23

3. © Merkel Freudenberg Fluidtechnic GmbH | Seals for Fluid Power Catalog 2007
Hydraulics | Rod Seals | Merkel U-Ring TM 23
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 DD
70 85 11,4 13 7,5 7 95 AU V157 24296870 DD
80 92 10,9 12 6 6 95 AU V157 24301858 DD
80 95 14,6 16 7,5 7 95 AU V157 24309920 DD
85 100 11,4 13 7,5 7 93 AU V167 24359397 DD
90 110 14,6 16 10 8,5 95 AU V157 24296871 DD
95 110 11,4 13 7,5 7 95 AU V157 24328307 DD
100 115 10,5 12 7,5 7 95 AU V157 24315670 DD
100 115 14,6 16 7,5 7 95 AU V157 24268764 DD
110 125 14,6 16 7,5 7 95 AU V157 24313031 DD
110 130 14,6 16 10 8,5 95 AU V157 24296872 DD
120 135 11,4 13 7,5 7 95 AU V157 24296681 DD
120 135 14,6 16 7,5 7 95 AU V157 24313025 DD
125 140 11,4 13 7,5 7 95 AU V157 24294247 DD
135 155 14,6 16 10 8,5 93 AU V167 24369133 DD
140 160 14,6 16 10 8,5 95 AU V157 24265472 DD
145 162 14,6 16 8,5 8 95 AU V157 24372351 DD
145 165 16 17,5 7,5 8,5 93 AU V167 24354392 DD
149 165 18,2 20 8 7 95 AU V157 24299881 DD
150 165 14,6 16 7,5 7 95 AU V157 24313029 DD
150 168 19,1 21 9 8 95 AU V157 24328308 DD
155 170 14,6 16 7,5 7 95 AU V157 24313030 DD
155 175 14,6 16 10 8,5 95 AU V157 24268763 DD
160 175 14,6 16 7,5 7 95 AU V157 24308961 DD
165 180 11,4 13 7,5 7 95 AU V157 24309919 DD
165 182 11,4 13 8,5 8 95 AU V157 24315950 DD
165 182 14,6 16 8,5 8 93 AU V167 24366938 DD
170 185 14,6 16 7,5 7 95 AU V157 24292396 DD
170 190 14,6 16 10 8,5 95 AU V157 24338291 DD
180 195 11,4 16 7,5 7 95 AU V157 24296682 DD
180 195 14,6 16 7,5 7 95 AU V157 24299882 DD
180 200 14,6 16 10 8,5 93 AU V167 24374346 DD
180 200 19,1 21 10 8,5 95 AU V157 24293702 DD
185 200 20,6 23 7,5 7 93 AU V167 24374555 DD
185 210 18,2 20 12,5 7 95 AU V157 24314005 DD
185 214 18,2 20 14,5 11 95 AU V157 24299628 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
d D H L Profile C Material Article No.
190 210 14,6 16 10 8,5 95 AU V157 24265473 DD
195 210 14,6 16 7,5 7 93 AU V167 24356464 DD
195 215 14,6 16 10 8,5 93 AU V167 24366936 DD
205 220 14,6 16 7,5 7 95 AU V157 24313032 DD
205 225 14,6 16 10 8,5 95 AU V157 24327442 DD
210 230 14,6 16 10 8,5 93 AU V167 24358106 DD
210 235 18,2 20 12,5 9,5 95 AU V157 24263447 DD
220 235 14,6 16 7,5 7 95 AU V157 24262955 DD
222 237 20,2 23 7,5 7 95 AU V157 24337054 DD
225 250 18,2 20 12,5 9,5 93 AU V167 24366939 DD
230 255 22,8 25 12,5 9,5 95 AU V157 24293703 DD
235 255 14,6 16 10 8,5 95 AU V157 24299884 DD
245 270 18,2 20 12,5 9,5 95 AU V157 24314006 DD
260 280 16,6 18 10 8,5 93 AU V167 24374345 DD
265 294 20 22 14,5 11 95 AU V157 24299629 DD
275 300 18,2 20 12,5 9,5 95 AU V157 24265474 DD
285 310 18,2 20 12,5 9,5 95 AU V157 24380148 DD
290 315 18,2 20 12,5 9,5 95 AU V157 24316205 DD
305 330 18,2 20 12,5 9,5 93 AU V167 24263445 DD
325 355 20 22 15 8 93 AU V167 24359407 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
Hydraulics | Rod Seals | Merkel U-Ring TM 23

5. © 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.