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 TMP 20
Merkel U-Ring TMP 20
PUR profile ring
Asymmetrical sealing lip
Fig. 1 Merkel U-Ring TMP 20
Product description
Single-acting rod seal made of abrasion-
resistant polyurethane.
Product advantages
Rod seal for heavy-duty pneumatic stress-
es and strains and high operating re-
quirements. New production technology
allows special sizes to be manufactured
quickly and flexibly. The Merkel U-rings
are designed for pressure on one side
High tightness
Suitable for dry air
Large range of dimensions
No mould tools required.
Application
Presses, large cylinders.
Material
Ø range <500 mm
Material Code Hardness Colour
Polyurethane 93 AU V167 93 Shore A Red
Ø range >500 mm
Material Code Hardness Colour
Polyurethane 93 AU V168 93 Shore A Red
Operating conditions
Material 93 AU V167/93 AU V168
Temperature range in °C
HFA fluids/water –10 … +80
Pressure p in MPa 2*
Running speed v in m/s 1,5
* short version <1,2 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%. Abrasive surfaces,
ridges, scratches and blow-holes must be avoided.
Design notes
Please observe our general design notes
in → Technical Manual.
Housing recommendations for new designs
d D L c
>50 … 200 d + 20 16 8,5
>100 … 320 d + 25 20 10,0
>150 … 630 d + 30 24 11,5
>400 … 800 d + 40 32 12,5
>800 … 1200 d + 50 40 16,0
>1000 … 2000 d + 60 48 18,0
Fitting & installation
The rod seals can be inserted into
plunge-cut grooves by hand or with a
fitting tool. In the case of different hous-
ings, such as in old plant, please ask our
advisory service. For optimum running-in
and operation behaviour the U-rings
should be lightly oiled or greased prior
to use (initial lubrication).
Merkel U-Ring TMP 20

2. © Merkel Freudenberg Fluidtechnic GmbH | Seals for Fluid Power Catalog 2007
Hydraulics | Rod Seals | Merkel U-Ring TMP 20
Article list
H
C
20°
DØ
d f8Ø
L
+0,2
R1 0,4
D1
H9
Ø D1
H9
Ø
>250mm H10
≤250mm H11
DFØ
>500mm +0,1
≤500mm H8
d D H Profile L C Material Article No.
50 70 14,6 10 16 8,5 93 AU V167 24377712 DD
60 80 14,6 10 16 8,5 93 AU V167 24377711 DD
80 100 14,6 10 16 8,5 93 AU V167 24370305 DD
90 110 14,6 10 16 8,5 93 AU V167 24370306 DD
100 120 14,6 10 16 8,5 93 AU V167 24370307 DD
110 130 14,6 10 16 8,5 93 AU V167 24370308 DD
160 180 14,6 10 16 8,5 93 AU V167 24371779 DD
170 200 20,9 15 23 11,5 93 AU V167 24368238 DD
180 210 20,9 15 23 11,5 93 AU V167 24368239 DD
210 240 20,9 15 23 11,5 93 AU V167 24368242 DD
220 250 20,9 15 23 11,5 93 AU V167 24368243 DD
240 270 20,9 15 23 11,5 93 AU V167 24367642 DD
250 280 20,9 15 23 11,5 93 AU V167 24368244 DD
270 300 20,9 15 26 11,5 93 AU V167 24368245 DD
280 310 20,9 15 23 11,5 93 AU V167 24368246 DD
330 360 20,9 15 23 11,5 93 AU V167 49001221 DD
350 380 23,7 15 23 11,5 93 AU V167 24368249 DD
370 400 23,7 15 26 11,5 93 AU V167 24368250 DD
390 420 23,7 15 26 11,5 93 AU V167 24368251 DD
400 430 23,7 15 26 11,5 93 AU V167 24368252 DD
420 450 23,7 15 26 11,5 93 AU V167 24368253 DD
440 470 23,7 15 26 11,5 93 AU V167 526870 DD
450 480 23,7 15 26 11,5 93 AU V167 24367970 DD
500 530 23,7 15 23 11,5 93 AU V167 24368255 DD
670 710 24,9 15 27 11,5 93 AU V168 24368259 DD
750 800 32 25 34 16 93 AU V168 24368261 DD
800 850 32 25 34 16 93 AU V168 24368262 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

3. © 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.