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801 814 802
821 822
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Water Seals GVA
Summary
V-shaped water seals are commonly made of RP (Rubber P-lastic) or FMK (Fluoro-rubber(FKM)) materials. Owing to its flexible and elastic characteristics, it makes installation extremely convenient. The water seals and axles work toget-her in a pair and follow the rotation movement of the axle.
Due to the simple structure of the V-shaped water seal, its easy of use and high durability, it has tremendously lessen the work needed for the design and installation of other drain and water channel products. Therefore, V-shaped water seals are widely used in engineering projects, water management equipment, pres-surizing machines and in car chassis.
1.Special Features and Advantages of the V-shaped Water Seals
The V-shaped water seal fixates on the axle through its own elastic properties. Its flexible sealing lip uses a sm-all contact force that contacts with the axle surface.
The flexible sealing lip can manage the eccentricity of the axles, cavity and differing angles of the axle and is also able to compensate for the errors made during the mac-hining process of the axle.
The sealing lip is effective in preventing leakage of the contents such as o-ils and lubricating liquids found inside the mechanical part and at the same time prevents external dust, dirt and other contaminants from entering into the inter-ior. As the V-shaped seal follows the rotational motion of the axle, the centrif-ugal force thus created causes the seal to act in a manner resembling slip rings and is a good medium for deterring contaminants to reach the interior.
V-shaped seal is different from the oil seal in that it relies on its elastic sealing lips which has a radial sealing effect. The seal lip possesses good flex-ibility and adaptability. Compared with other sealing equipment, it has a simple design, requires a smaller clearance to use and at the same time solves the problem of the eccentric rotation of the axle.
The V-shaped seal possesses the following advantages:
-Pure elastic rubber construction without any additions of metals
-Eases the workload on design processes and easily installed with no remachi-ning needed
-Eliminates the need for re-machining of the axle surface and complies with the surface precision and hardness for the axle surface. Therefore axles do not necessarily need to be hard.
-Easy installation and removal; high reliability
-Small surface contact with other parts, thereby lowering frictional forces and heating due to friction resulting in a longer life span
-Doubles as a medium for sealing effect and prevents dust from contamination the interior
2.Materials
V-shaped seals are normally manufactured using 2 types of raw materials:
1.Shore Hardness Type A 60 RP
Operating Temperature: -40 ~ +100 Degrees Celsius
Medium: Mineral Oil, Air, Water, Milk-like liquids, Fats
2.Shore Hardness Type A 65 FKM
Operating Temperature: -20 ~ +180 Degrees Celsius
Medium: Mineral Oil, Fats and Oil Composites, Acids, Alkalis
3.4 Standard Designs for the V-shaped Water Seals
Cross Sectional Profile
Type
VA
VS
VL
VE
Comments
Most commonly used design
This type is wider and taper. Will achieve a tight fit when used with axle
Narrow cut on axle side. High density construction. Normally used with labyrinth seal
Mainly used under heavy loading conditions as the 2nd seal. It has the largest cross sectional area and allows greater movement of the axle
Specifications
Axle Diameter: 2.7~2020mm
Axle Diameter: 4.5~210mm
Axle Diameter: 105~2025mm
Axle Diameter: 450~2010mm
4.Design Principles
I.Choice of V-shaped Water Seal
The size of the V-shaped water sealers can normally be chose from a range of diameter size. However, if the nominal diameter happens to fall between the sizes of 2 different sealers, then the bigger diameter should be used.
II.Surface Suited Design
Precision processing should be used to achieve a well suited design on the s-urface. Recommended radius size is 10~16 μm
III.Angle of Tilt of Axle
The V-shaped seal, being different from the other axel sealers, must maintain a slight tilt to achieve a good seal. The recommended tilt tolerance is at 1°
VAVS water seal deflexion angle which permits
4. Proper alignment and bias
V shape hydraulic packing permission between the Axle and the cavity body ax-ial deviation, its biggest permission bias may in 1 obtain from the graph, these values are suitable for VA and the VS design, and V shape hydraulic packing by a-xial strut on Axle. Said to packaged design VL, its permission eccentric quantity remarkable reduction, on the other hand designs to VE said, it has a bigger sect-ion, may permit an greater eccentric quantity. In V shape hydraulic packing not by axial strut on Axle time, the graph in 1 obtains the data must reduce, formula as follows:
α=α max-0.0005n
α -V shape hydraulic packing not by axial strut on Axle when permits bias, u-nit: o
αmax -Water seal biggest permission bias which in gains from the chart 1, uni-t: o
n -Rotate Speed Unit: revolution/ minute
表1 同轴度和动态偏差
VA and VS
Axle dia d1
同轴度和动态总偏差 t1
≤9.5
0.4
9.5-19.5
0.6
19.5-38
0.9
38-68
1.1
68-105
1.4
105-155
1.6
155-210
1.9
210-2020
3.6
VL
135-630
1.5
VE
450-2100
6.0
5．Axial displacement
V shape link is opposite to the contact face permission axial displacement
Sheet 2 axial displacement
VA and VS
Axle dia d1
allow axial displacement t2
≤9.5
0.4
9.5-19.5
0.6
19.5-38
0.8
38-68
1.0
68-105
1.2
105-155
1.5
155-210
1.8
210-2020
4.0
VL
135-630
1.5
VE
450-2100
12.0
6．Skids speed request and strut link
V shape hydraulic packing can in certain skid under the speed to revolve. Mu-st pay attention, when the speed approaches 12M/S the circumferential velociy wi-ll increase, the friction loses can increase, after but surpasses this speed, the oversized centrifugal force will seal causes to seal the lip to be separated fro-m. When the speed surpasses 15M/S time, V shape hydraulic packing lip mouth will be able and the contact face separates, this time it only will play to a gap seal role. Therefore, when V shape hydraulic packing along with rotation of axis when its cut-off velocity probably is 10m/s or 12m/s, must from axial its be fixed, if in table 3 shows the L shape strut link may satisfy this request. It by the mach-ine-finishing or the steel products, the alloy and so on the direct ramming takes shape.
To supports the link the outer diameter and highly does not have the strict limit, following is the recommendation L shape strut link aperture and drillhole depth.
To supports the link aperture to demarcate the size to be allowed to obtain by the following formula, and achieves the enough precision.
di= strut link aperture demarcates size
d1= Axle diameter
d= The installment V shape water seal inside diameter size. See the product sheet.
c=V shape water seal section high, See the product sheet.
x=According to size but different leveling system, See the sheet 3.
Suggested the aperture di common difference is the H9 unit: Mm
Supports the link to have to be located V shape water seal slightly to depend on after the position, therefore, according to V shape water seal different desi-gn type suggestion following drillhole depth size, ta (unit mm)
-VA：ta=0.83A
-VL：ta=4
-VS：ta=0.83（A-C）+C
-VE：ta=20
V shape water seal axle block width A, and its section highly C may obtain by the product sheet.
校正系数X
轴径d1
系数X
7-16
0.2
16-58
0.3
58-135
0.4
135-180
0.5
＞180
0.8
5.Installment
V shape water seal installment does not need to design the installment bevel edge, V shapeelongate is an elastomer. after may stretch pushes sets on other co-mponents, V shape ring biggest elongate 20%, therefore is extremely easy to ins-tall (chart 1)
In many situations, V shape water seal may use one kind of simple tool to in-stall (like chart 2), but the rotating axis and with does not have blade the tool impels or to the center V shape hydraulic packing, arrives the correct installme-nt position.
When replaces V shape water seal to involve to demolishes several other comp-onents consumes the work, may cut V shape water seal two spots, lays aside after the suitable position, then uses the cementing material and the tool connects two parts, pays attention to joint not to be possible to stretch.
chart 1
chart 2
6.V shape water seal application
1.V shape water seal uses in the seal lubrication, and concurrently is dustp-roof and water.
2.V shape water seal uses in the seal lubrication
a. If the axis fixes in a direction revolves, may operate the coil trough in the lip mouth contact face, causes the oil passes "pumps" to be supposed to fl-ow out the axis surface.
b.If the axis revolves in two dire-ctions, the use excretion trough makes the oil hole.
3.V shape water seal is dust water seal
4.V shape water seal may serve as other seals the assistance seal
Installation chart
Note: When the axle diameter d1 size in two V shape link boundary, please choose the great size V shape link. All sizes unit is mm.
diameter form
ordering No.
Axle diameter size
d1
Inside diameter
d
section high
C
section dimension
A
section dimension
B
dimen-sion
d2
dimen-sion
d3
installation dimension
B1
GVA-0030
2.7-3.5
2.5
1.5
2.1
3.0
d1+1
d1+4
2.5±0.3
GVA-0040
3.5-4.5
3.2
2
2.4
3.7
d1+1
d1+6
3.0±0.4
GVA-0050
4.5-5.5
4
2
2.4
3.7
d1+1
d1+6
3.0±0.4
GVA-0060
5.5-6.5
5
2
2.4
3.7
d1+1
d1+6
3.0±0.4
GVA-0070
6.5-8.0
6
2
2.4
3.7
d1+1
d1+6
3.0±0.4
GVA-0080
8.0-9.5
7
2
2.4
3.7
d1+1
d1+6
3.0±0.4
GVA-0100
9.5-11.5
9
3
3.4
5.5
d1+1
d1+9
4.5±0.6
GVA-0120
11.5-12.5
10.5
3
3.4
5.5
d1+1
d1+9
4.5±0.6
GVA-0130
12.5-13.5
11.7
3
3.4
5.5
d1+1
d1+9
4.5±0.6
GVA-0140
13.5-15.5
12.5
3
3.4
5.5
d1+1
d1+9
4.5±0.6
GVA-0160
15.5-17
14
3
3.4
5.5
d1+1
d1+9
4.5±0.6
GVA-0180
17.5-19
16
3
3.4
5.5
d1+1
d1+9
4.5±0.6
GVA-0200
19-21
18
4
4.7
7.5
d1+2
d1+12
6.0±0.8
GVA-0220
21-24
20
4
4.7
7.5
d1+2
d1+12
6.0±0.8
GVA-0250
24-27
22
4
4.7
7.5
d1+2
d1+12
6.0±0.8
GVA-0280
27-29
25
4
4.7
7.5
d1+2
d1+12
6.0±0.8
GVA-0300
29-31
27
4
4.7
7.5
d1+2
d1+12
6.0±0.8
GVA-0320
31-33
29
4
4.7
7.5
d1+2
d1+12
6.0±0.8
GVA-0350
33-36
31
4
4.7
7.5
d1+2
d1+12
6.0±0.8
GVA-0380
36-38
34
4
4.7
7.5
d1+2
d1+12
6.0±0.8
GVA-0400
38-43
36
5
5.5
9.0
d1+2
d1+15
7.0±1.0
GVA-0450
43-48
40
5
5.5
9.0
d1+2
d1+15
7.0±1.0
GVA-0500
48-53
45
5
5.5
9.0
d1+2
d1+15
7.0±1.0
GVA-0550
53-58
49
5
5.5
9.0
d1+2
d1+15
7.0±1.0
GVA-0600
58-63
54
5
5.5
9.0
d1+2
d1+15
7.0±1.0
GVA-0650
63-68
58
5
5.5
9.0
d1+2
d1+15
7.0±1.0
GVA-0700
68-73
63
6
6.8
11.0
d1+3
d1+18
9.0±1.2
GVA-0750
73-78
67
6
6.8
11.0
d1+3
d1+18
9.0±1.2
GVA-0800
78-83
72
6
6.8
11.0
d1+3
d1+18
9.0±1.2
GVA-0850
83-88
76
6
6.8
11.0
d1+3
d1+18
9.0±1.2
GVA-0900
88-93
81
6
6.8
11.0
d1+3
d1+18
9.0±1.2
GVA-0950
93-98
85
6
6.8
11.0
d1+3
d1+18
9.0±1.2
GVA-1000
98-105
90
6
6.8
11.0
d1+3
d1+18
9.0±1.2
GVA-1100
105-115
99
7
7.9
12.8
d1+4
d1+21
10.5±1.5
GVA-1200
115-125
108
7
7.9
12.8
d1+4
d1+21
10.5±1.5
GVA-1300
125-135
117
7
7.9
12.8
d1+4
d1+21
10.5±1.5
GVA-1400
135-145
126
7
7.9
12.8
d1+4
d1+21
10.5±1.5
GVA-1500
145-155
135
7
7.9
12.8
d1+4
d1+21
10.5±1.5
GVA-1600
155-165
144
8
9.0
14.5
d1+4
d1+24
12.0±1.8
GVA-1700
165-175
153
8
9.0
14.5
d1+4
d1+24
12.0±1.8
GVA-1800
175-185
162
8
9.0
14.5
d1+4
d1+24
12.0±1.8
GVA-1900
185-195
171
8
9.0
14.5
d1+4
d1+24
12.0±1.8
GVA-1990
195-210
180
8
9.0
14.5
d1+4
d1+24
12.0±1.8
GVA-2000
190-210
180
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-2200
210-235
198
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-2500
235-265
225
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-2750
265-290
247
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-3000
290-310
270
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-3250
310-335
292
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-3500
335-365
315
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-3750
365-390
337
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-4000
390-430
360
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-4500
430-480
405
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-5000
480-530
450
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-5500
530-580
495
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-6000
580-630
540
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-6500
630-665
600
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-7000
665-705
630
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-7250
705-745
670
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-7500
745-785
705
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-8000
785-830
745
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-8500
830-875
785
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-9000
872-920
825
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-9500
920-965
865
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-10000
965-1015
910
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-10500
1015-1065
955
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-11000
1065-1115
1000
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-11500
1115-1165
1045
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-12000
1165-1215
1090
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-12500
1215-1270
1135
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-13000
1270-1320
1180
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-13500
1320-1370
1225
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-14000
1370-1420
1270
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-14500
1420-1470
1315
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-15000
1470-1520
1360
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-15500
1520-1570
1405
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-16000
1570-1620
1450
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-16500
1620-1670
1495
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-17000
1670-1720
1540
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-17500
1720-1770
1585
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-18000
1770-1820
1630
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-18500
1820-1870
1675
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-19000
1870-1920
1720
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-19500
1920-1970
1765
15
14.3
25.0
d1+10
d1+45
20.0±4.0
GVA-20000
1970-2020
1810
15
14.3
25.0
d1+10
d1+45
20.0±4.0
Note: bigger than 90mm the inside diameter the VS shape hydraulic packing to need specially to have custom-made.
ordering example：
water seal VS style
Axle diameter size d1=105～115mm
lambing with ordering number：GVA1100－NBR
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