Rod Seals
Merkel U-Ring N 1, AUN 1
Wipers
Piston Seals
Merkel U-Ring N 1, AUN 1 Product description
Product advantages
Application
U-ring for rods/pistons with symmetrical profile.
Single-acting piston or rod seals preferably for spare parts requirement.
Special cylinders, agricultural machinery, cranes, injection moulding machines, loading platforms, standard cylinders.
Profile ring
Guides
Sealing lips
Material N1 Material
Designation
Hardness
Nitrile rubber NBR
90 NBR 109
90 Shore A
Material
Designation
Hardness
Polyurethane
94 AU 925
94 Shore A
Rotary Seals
AUN 1
Operating conditions Material
90 NBR 109
94 AU 925
–30 … +100
–30 … +110
HFA fluids
+5 … +60
+5 … +50
HFB fluids
+5 … +60
+5 … +50
HFC fluids
–30 … +60
–30 … +40
HFD fluids
–
–
Rotor Seals
Temperature range in °C
Symmetric Seals
Hydraulic oils HL, HLP
Water
+5 … +90
+5 … +40
HETG (rapeseed oil)
–30 … +80
–30 … +60
HEES (synthetic esters)
–
–30 … +60
HEPG (glycol)
–30 … +60
–30 … +40
Mineral greases
–30 … +100
–30 … +110
10 MPa
20 MPa
Pressure
0,5
Fitting Tools
Static Seals
Sliding speed v in m/s
1
© 2006 Merkel Freudenberg Fluidtechnic GmbH, © 2006 Freudenberg Simrit GmbH & Co. KG
Rod Seals
Merkel U-Ring N 1, AUN 1
Surface roughness
Ra
Rmax
Sliding surface
0,05 … 0,3 mm
≤2,5 mm
Groove base
≤1,6 mm
≤6,3 mm
Groove flanks
≤3 mm
≤15 mm
Piston Seals
Surface quality
Percentage contact area Mr >50% up to max. 90% at cutting depth c = Rz/2 and reference line C ref = 0%
Please observe our general design notes in Technical Principles.
→
Wipers
Design notes Simrit Standard Catalogue, Merkel Hydraulics –
Gap dimension
Guides
The largest gap dimension occurring on the non-pressurised side of the seal in operation is of vital importance for the function of the seal → Simrit Standard Catalogue, Merkel Hydraulics – Technical Principles. N 1 (Material 90 NBR 109) Max. permissible gap size 2,5 MPa
5 MPa
7,5 MPa
10 MPa
≤5,0
0,45
0,35
0,3
0,25
>5,0
0,5
0,4
0,35
0,3
Rotary Seals
Section
AUN 1 (Material 94 AU 925) Max. permissible gap size 5 MPa
10 MPa
20 MPa
≤5,0
0,55
0,4
0,35
>5,0
0,66
0,45
0,4
Rotor Seals
Section
Tolerance recommendation and dimension D2/d2
Symmetric Seals
During the design of D2 (rod seal) or d2 (piston seal) the permissible gap dimension, tolerances, guide play and deflection of the guide under load are to be taken into consideration. → Simrit Standard Catalogue, Merkel Hydraulics – Technical Principles.
Fitting & installation
Fitting Tools
Static Seals
Careful fitting is a prerequisite for correct function of the seal. → Simrit Standard Catalogue, Merkel Hydraulics – Technical Principles. Note: The use of male adaptors increases the reliability. Further information is available on enquiry.
© 2006 Merkel Freudenberg Fluidtechnic GmbH, © 2006 Freudenberg Simrit GmbH & Co. KG
2
Rod Seals
Merkel U-Ring N 1, AUN 1
Article list
Piston Seals
N1
H H1
L
L+0, 2
+0,2
Rounded and free of burrs R2 < 0,2
Rounded and free of burrs R2
