Radial Seal MR21

DESCRIPTION

Radial Seal MR21 is a double-acting seal for rotary movements and joint sealing and is used in hydraulic rotary transmission systems. The radial seal MR21 seal the space between the pressure lines, separating them from each other and is suitable for sealing high hydraulic pressures during rotating movements.

It consists of a PTFE profile ring and an O-ring as a preload element.

The radial seal MR21 has small dimensions, is highly resistant to hydraulic fluids and has very low friction and, by choosing the appropriate material, good resistance to high and low temperatures.

APPLICATION
Exscavators
Grippers
Swivel joints
Hose reels
High pressure valve stem
Diferent rotary distributors

MATERIAL

Standard material
Material Set Code SN209 SF208
O-ring 70 ShA NBR FPM
Profile Ring PTFE glass,MoS2 PTFE glass,MoS2

For low temperature applications, or excellent medium-rubber compatibililty in special applications a few materials are recommended and available on request

OPERATING CONDITIONS

Pressure, Speed
Working pressure, P Max 40 Mpa
Running speed v, Up to 0.2 m/s

Medium, Working Temperature
Material Code SN209 SF208
Hydraulic oils: HL, HLP -30.. +100 ˚C -10.. +150 ˚C
HFA, HBA fluids +5..+60 oC –
HFC fluids -30..+60 oC –
HFD fluids – -10.. +150 ˚C
Water +5..+100oC –
Mineral greases -30 to +100 -10.. +150 ˚C

DESIGN RECOMMENDATION

Tolerances
Ød emax ØD
≤ 500 mm H8/f8 H9

Surface finish*
Surface roughness Ra Rmax
Sliding surfaces 0.05 .. 0,3μm ≤ 2.5 μm
Groove base ≤ 1.6 μm ≤ 6.3 μm
Groove flanks ≤ 3 μm ≤ 15 μm

*Contact area Mr = 50% to 90% at cutting depth c=Rz/2 and reference line Cref=0% Surface hardness must be 45 – 60 HRC with 0.5mm layer in depth

Ød
ØD
H
L
S
Material
Filters Sort results
Reset Apply
Ød
ØD
H
L
S
O-Ring d1 (mm)
O-Ring d2 (mm)
Material
Order code
30
41
3.9
4.2
5.5
34.52
3.53
T1021
MR21-253012
35
46
3.9
4.2
5.5
40.87
3.53
T1021
MR21-253013
36
47
3.9
4.2
5.5
40.87
3.53
T1021
MR21-253014
40
51
3.9
4.2
5.5
44.04
3.53
T1021
MR21-253015
40
55.5
5.9
6.3
7.75
43.80
5.33
T1021
MR21-253016
45
56
3.9
4.2
5.5
50.39
3.53
T1021
MR21-253017
50
61
3.9
4.2
5.5
53.57
3.53
T1021
MR21-253018
50
65.5
5.9
6.3
7.75
56.52
5.33
T1021
MR21-253019
55
66
3.9
4.2
5.5
59.92
3.53
T1021
MR21-253020
56
67
3.9
4.2
5.5
59.92
3.53
T1021
MR21-253021
60
71
3.9
4.2
5.5
63.09
3.53
T1021
MR21-253022
63
74
3.9
4.2
5.5
66.27
3.53
T1021
MR21-253023
65
76
3.9
4.2
5.5
69.44
3.53
T1021
MR21-253024
65
80.5
5.9
6.3
7.75
72.39
5.33
T1021
MR21-253025
70
81
3.9
4.2
5.5
75.79
3.53
T1021
MR21-253026
70
85.5
5.9
6.3
7.75
75.57
5.33
T1021
MR21-253027
75
86
3.9
4.2
5.5
78.97
3.53
T1021
MR21-253028
75
90.5
5.9
6.3
7.75
81.92
5.33
T1021
MR21-253029
80
91
3.9
4.2
5.5
85.32
3.53
T1021
MR21-253030
80
95.5
5.9
6.3
7.75
85.09
5.33
T1021
MR21-253031
85
100.5
5.9
6.3
7.75
91.44
5.33
T1021
MR21-253032
90
101
3.9
4.2
5.5
94.84
3.53
T1021
MR21-253033
90
105.5
5.9
6.3
7.75
97.79
5.33
T1021
MR21-253034
100
111
3.9
4.2
5.5
104.37
3.53
T1021
MR21-253035
100
115.5
5.9
6.3
7.75
107.32
5.33
T1021
MR21-253036
110
121
3.9
4.2
5.5
113.89
3.53
T1021
MR21-253037
110
125.5
5.9
6.3
7.75
116.84
5.33
T1021
MR21-253038
115
126
3.9
4.2
5.5
120.24
3.53
T1021
MR21-253039
120
131
3.9
4.2
5.5
123.42
3.53
T1021
MR21-253040
125
136
3.9
4.2
5.5
129.77
3.53
T1021
MR21-253041
125
140.5
5.9
6.3
7.75
132.72
5.33
T1021
MR21-253042
130
141
3.9
4.2
5.5
136.12
3.53
T1021
MR21-253043
140
151
3.9
4.2
5.5
145.64
3.53
T1021
MR21-253044
140
155.5
5.9
6.3
7.75
145.42
5.33
T1021
MR21-253045
150
161
3.9
4.2
5.5
158.34
3.53
T1021
MR21-253046
150
165.5
5.9
6.3
7.75
158.12
5.33
T1021
MR21-253047
160
171
3.9
4.2
5.5
164.69
3.53
T1021
MR21-253048
160
175.5
5.9
6.3
7.75
164.47
5.33
T1021
MR21-253049
180
191
3.9
4.2
5.5
183.74
3.53
T1021
MR21-253050
180
195.5
5.9
6.3
7.75
189.87
5.33
T1021
MR21-253051
190
201
3.9
4.2
5.5
196.44
3.53
T1021
MR21-253052
200
215.5
⋅
55.5
5.9
6.3
7.75
208.92
5.33
T1021
MR21-253053