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BECA 830

BECA 830
BECA 830
beca_830_3d_v4
beca_830_3d_v3

Description

The BECA 830 profile is a standard floating seal or face seal composed of two metal parts made from 100Cr6 bearing steel or Cast iron and two rubber O'Rings.

Advantages

Wide temperature range, depending on the material chosen
Longer lifespan
Very little maintenance required
Easy to fit

Technical data

Temperature

-60°C/+180°C

Pressure

0.15 MPa in bearing steel in dynamic applications
0.30 MPa in Cast iron in dynamic applications
0.50 MPa in static applications

Speed

2.2 m/s in bearing steel
3.0 m/s in 15CrMoNi Cast iron
10.0 m/s in Durinit Cast iron

Medias

Oil lubrication
Grease lubrication
SAE 80 - SAE 90
SAE 20W20 - 10W40 oils
Biocompatible oils

Applications

Construction machinery
Excavator rollers
Rigid axles on tractors
Gear boxes
Steering axles

Materials

Metal friction rings

100Cr6 bearing steel
15CrMoNi Cast iron
Durinit Cast iron

O'Ring

NBR 60 - 65 Shore A
HNBR 60 - 65 Shore A
FKM 60 - 65 Shore A
VMQ 60 - 65 Shore A

Dimensions
Installation dimensions
Materials
Technical data
Assembly recommendations

Dimensions

Installation drawingLogement Gorge Joint à glace - Housing Groove Floating seal Face seal Duo cone seal - BECA 830

Installation dimensions

The diagram below sets out all of the elements that make up the BECA 830 floating seal as well as the housing into which it is inserted.

Description of floating seal - face seal - BECA 830

Materials

Metal parts

The metal parts can be made from two different materials.

15CrMoNi Cast iron

The standard material used for the metal parts is 15CrMoNi Cast iron with a hardness of 65 - 72 HRC and that has been developed to resist extreme conditions (environments that are abrasive, corrosive and have strong external demands). It can support a speed up to 3 m/s.

Chemical composition in % cast iron
15CrMoNi
C 3.2 - 3.8
Mn 0.5 - 1.0
Si 1.0 - 2.0
P < 0.2
S < 0.2
Cr 14.0 - 16.0
Ni 0.4 - 0.6
Mo 0.8 - 1.2
V ≤ 0.2
Durinit cast iron

The Durinit material is a special Cast iron developed for applications that require permissible speeds of 10 m/s max. This special cast iron has a hardness of 58 - 65 HRC.

Chemical composition in % cast iron
Durinit
C 2.8 - 3.6
Mn 0.3 - 0.9
Si 1.5 - 2.0
P ≤ 0.3
S ≤ 0.1
Cr 2.5 - 3.0
Ni 3.5 - 4.0
Mo 0.3 - 0.5
V ≤ 0.4
100Cr6 bearing steel

The bearing steel type 100Cr6 with a hardness of 55 - 63 HRC is a more economical solution that can be used for the metal parts. This material can support a speed up to 2.2 m/s.

Chemical composition in % Standard bearing steel
100Cr6
C 0.8 - 1.0
Mn 0.2 - 0.4
Si 0.2 - 0.3
P < 0.02
S < 0.02
Cr 0.8 - 1.5
Ni < 0.2
Cu < 0.2
Mo 0.02 - 0.08

Rubbers

NBR (Nitrile Butadiene Rubber)

Nitrile rubber (NBR) is the general term for acrylonitrile-butadiene copolymer. The ACN content can vary between 18% and 50%. While the acrylonitrile content is important, the resistance to oil and fuel is more so. Conversely, the elasticity and compression set are not as good. The NBR has good mechanical properties and good wear resistance. However, its resistance to atmospheric agents and the ozone is relatively low.

Chemical resistance Aliphatic hydrocarbons (propane, butane, petroleum, diesel fuel)
Mineral oils and greases
Fire-resistant fluids (HFA, HFB and HFC)
Diluted acids, low-temperature alkaline and saline solutions
Water (up to +100°C max)
Compatibility issue Fuels with high aromatic content
Aromatic hydrocarbons (benzene)
Chlorinated hydrocarbons (trichlorethylene)
Polar solvents (ketone, acetone, acetic acid, ethylene-ester)
Strong acids
Glycol-based brake fluids
Atmospheric and ozone agents
Temperature range -30°C / +100°C (short-term peak at +120°C)
-40°C / +100°C with particular NBRs
FKM (fluorinated rubber)

Depending on their structure and fluorine content, the chemical resistance and resistance to the cold in fluororubbers can vary. This FKM-based rubber is very often used for high-temperature hydraulics and pneumatics, for industrial valves, injection/fuel systems, motor seals and high-vacuum systems.

Chemical resistance Mineral oils and greases, ASTM n°1, IRM 902 and IRM 903 oils.
Fire-resistant liquids (HFD)
Silicone oils and greases
Mineral and vegetable oils and greases
Aliphatic hydrocarbons (propane, butane, petroleum)
Aromatic hydrocarbons (benzene, toluene)
Chlorinated hydrocarbons (trichlorethylene)
Fuel (including high alcohol content)
Atmospheric and ozone agents
Compatibility issue Glycol-based brake fluids
Ammonia gas
Organic acids with a low molecular weight (formic and acetic acids)
Temperature range -20°C / +200°C (short-term peak at +230°C)
-40°C / +200°C with particular FKMs
HNBR (Hydrogenated Nitrile Butadiene Rubber)

This HNBR-based rubber is obtained through selective hydrogenation of the NBR's butadiene groups. It is commonly used for power-assisted steering and for air conditioning.

Chemical resistance Aliphatic hydrocarbons
Mineral and vegetable oils and greases
Fire-resistant fluids (HFA, HFB and HFC)
Diluted acids, saline solutions and bases for operation at an average temperature
Water and steam up to +150°C
Atmospheric and ozone agents
Compatibility issue Chlorinated hydrocarbons
Polar solvents (ketones, esters and ethers)
Strong acids
Temperature range -30°C / +150°C (short-term peak at +160°C)
-40°C / +150°C with particular HNBRs
VMQ (silicone rubber: methyl vinyl polysiloxane)

This FVMQ-based rubber is very often used in fuel systems.

Chemical resistance Animal and vegetable oils and greases
Water for operation at an average temperature
Diluted saline solutions
Atmospheric and ozone agents
Compatibility issue Superheated steam up to +120°C
Chlorinated hydrocarbons with a low molecular weight (trichlorethylene)
Aromatic hydrocarbons (benzene, toluene)
Temperature range -60°C / +200°C (short-term peak at +230°C)

The table below gives an overview of the physical, chemical and mechanical characteristics for each of the materials.

Characteristics/Materials FKM HNBR NBR VMQ
Abrasion resistant 2 2 2 4
Resistance to acids 1 1 3 3
Chemical resistance 1 2 2 2
Resistance to cold 4 2 2 2
Dynamic properties 2 1 2 4
Electrical properties 4 3 3 1
Flame resistant 1 4 4 3
Heat resistant 1 1 2 1
Sealing water 2 2 2 4
Oil resistant 1 1 1 2
Ozone resistant 1 2 4 1
Tearing resistant 3 2 2 4
Traction resistant 1 1 2 4
Water/vapour resistant 3 1 2 3
Resistance to atmospheric agents 1 2 3 1

1. Excellent properties 2. Good properties 3. Average properties 4. Poor properties

Chemical compatibility

A "Chemical compatibility guide" catalogue can be downloaded from the Documentation section. You can also use our online "Chemical compatibility" tool free of charge.

These two tools give you the option of measuring the behaviour of our materials that come into contact with the majority of existing fluids. The data displayed is the result of rigorous testing of the ambient temperature and in consultation with previous publications. Test results are not fully representative due to the specific features of your application. The tests performed actually do not consider additives and impurities that may exist under the actual conditions of use, nor the potential elevation of temperatures. Other parameters can also alter the behaviour of our materials, such as the hardness, persistence, abrasion, etc. We therefore recommend performing your own tests to verify the compatibility of our materials according to your specific application. Our technical team can provide you with any additional information.

Technical data

Types of lubrication

For the system to operate correctly, it is necessary to lubricate the seal at the sealing gaps. We recommend using oil lubrication rather than grease lubrication.

  • For an oil lubrication that is permanent and does not require upkeep, the oil level must be between the 2/3 of the inside diameter of the seal and the middle of the axis. We recommend using SAE 80 and SAE 90 gearbox oils for a better operation.
  • Grease lubrication requires particular attention. It is avoided due to the hydrodynamic conditions of lubrication that cannot be met, which could lead to significant wear and therefore a premature deterioration of the seal. If grease lubrication is used, the grease must not be inserted between the friction surfaces of the seal.

 

Limitations of use

The diagram below determines the linear speed (m/s), in line with the outside diameter of the floating seal "D1" (mm) and its rotation speed (rpm).

Nomogram for determining peripheral speed for floating seals - face seals

 

Determining the Installation dimensions "I"

The Installation dimensions "I" affects the position of the floating seal, the compression of the O'Rings and the axial force. For standard applications using the BECA 830 profiles, a value of 3 mm (+/-0.5) must be taken into consideration for the Installation dimensions "I".

We recommend increasing the assembly dimension to prevent a load on the seal surfaces that is too large, which leads to heating during significant peripheral speeds (5 to 10 m/s).

Determining Installation dimension  I  for floating seals - face seals - BECA 830

 

Determining the friction power

Frictional loss for floating seals - face seals - BECA 830 - 831

 

Permissible pressure

The floating seals can be used for maximum pressures of 0.30 MPa for Cast iron and 0.15 MPa for 100Cr6 bearing steel.

 

Surface roughness

Roughness Contact surface area
Ra ≤ 3.2 µm
Rz ≤ 10.0 µm
Rmax ≤ 16.0 µm

Assembly recommendations

The floating seals are in standard hard Cast iron precision parts. Do not knock or bump them. The floating seals are mounted as follows:

  • The seal must not be removed from its original packaging until just before it is fitted, and it must protect the operational surfaces (A) from any soiling or deterioration.
  • The housings of the seal (B) must be clean and there must be no burrs around the installation.
  • The floating seals must be fitted using mounting tools (D). They are composed of two bearing shells fitted around a floating seal. In this way, the exertion required for installation is applied directly through the O'Ring (C).
  • The floating seal must then be inserted into the housing, and all parts must be positioned symmetrically.
  • The O'Rings, once put in place, must not be twisted or jammed.
  • Before the final fitting, a thin film of oil must be applied to the two operational parts with a lint-free cloth (e.g.: a chamois)

Assembly recommandation for floating seals - face seals

162 dimensions found
830.003803
Standard request
38,00 51,00 20,00 40,00 6,70
830.003804
Standard request
38,00 51,00 20,00 41,00 6,00
830.003801
Standard request
38,00 51,00 20,40 41,00 6,00
830.004502
Standard request
45,00 58,00 21,00 48,00 6,10
830.004601
Standard request
46,00 59,00 20,00 47,50 6,50
830.004801
Standard request
48,00 58,00 14,40 51,00 4,00
830.004802
Standard request
48,00 62,15 25,00 50,00 7,50
830.005505
Standard request
55,50 70,00 22,00 58,00 7,50
830.005506
Standard request
55,50 70,00 22,00 58,00 8,00
830.005601
Standard request
56,00 70,00 26,00 60,00 7,60
830.006002
Standard request
60,20 73,00 20,00 60,00 6,50
830.006301
Standard request
63,00 80,50 26,00 66,00 8,00
830.006305
Standard request
63,50 82,40 32,00 66,00 9,50
830.006402
Standard request
64,00 78,00 25,00 66,00 8,20
830.006401
Standard request
64,00 78,00 25,00 67,00 8,00
830.006701
Standard request
67,00 80,00 20,00 68,50 6,50
830.006705
Standard request
67,50 86,50 31,80 71,00 9,50
830.006801
Standard request
68,00 89,00 24,00 75,00 8,00
830.007101
Standard request
71,00 84,00 20,00 72,50 6,50
830.007102
Standard request
71,50 91,00 29,00 75,00 9,00
830.007302
Standard request
73,00 92,00 32,00 75,70 9,50
830.007705
Standard request
77,50 87,60 13,60 78,00 4,30
830.007706
Standard request
77,50 88,50 15,00 78,00 4,30
830.007901
Standard request
79,00 100,00 30,00 85,00 9,50
830.007905
Standard request
79,50 92,50 20,00 81,00 6,50
830.008002
Standard request
80,00 100,00 29,00 83,00 9,00
830.008001
Standard request
80,00 100,00 30,00 85,00 9,30
830.008101
Standard request
81,00 98,00 28,00 82,00 8,00
830.008301
Standard request
83,00 102,00 28,00 87,00 8,50
830.008705
Standard request
87,50 77,50 14,00 78,00 4,30
830.008801
Standard request
88,00 108,00 24,00 93,00 8,00
830.009002
Standard request
90,00 105,00 26,00 93,00 6,30
830.009001
Standard request
90,00 109,00 32,00 93,00 9,50
830.009007
Standard request
90,50 104,50 26,00 93,00 6,30
830.009006
Standard request
90,50 109,50 32,00 93,20 9,50
830.009502
Standard request
95,00 111,00 24,00 99,00 7,70
830.009901
Standard request
99,00 120,00 28,00 105,00 8,50
830.010001
Standard request
100,00 119,00 32,00 102,80 9,50
830.010101
Standard request
101,00 120,00 29,00 104,00 8,50
830.010303
Standard request
103,00 117,00 20,00 105,00 6,50
830.010401
Standard request
104,00 125,00 28,00 110,00 8,50
830.010702
Standard request
107,00 125,00 24,00 110,00 7,70
830.010701
Standard request
107,00 125,00 24,00 110,00 8,50
830.011001
Standard request
110,00 128,00 32,00 113,00 9,20
830.011101
Standard request
111,00 128,00 22,00 116,00 7,00
830.011401
Standard request
114,00 137,00 31,00 121,00 9,20
830.011405
Standard request
114,50 129,00 21,00 117,00 7,00
830.011601
Standard request
116,00 138,00 32,00 123,50 9,50
830.011701
Standard request
117,00 140,00 29,00 124,00 8,70
830.011805
Standard request
118,50 139,50 28,00 124,00 8,50
830.012006
Standard request
120,00 138,00 32,00 122,50 8,40
830.012005
Standard request
120,00 138,00 32,00 124,30 9,00
830.012001
Standard request
120,00 139,00 31,80 123,50 9,50
830.012501
Standard request
125,00 144,00 31,80 128,50 9,50
830.012703
Standard request
127,00 141,00 25,40 130,00 6,30
830.012701
Standard request
127,00 141,00 29,00 125,00 8,30
830.012705
Standard request
127,00 146,00 31,00 130,00 9,50
830.012702
Standard request
127,00 146,00 32,00 130,00 9,50
830.013505
Standard request
135,50 154,50 28,00 139,00 8,30
830.014305
Standard request
143,00 156,60 25,00 143,00 6,25
830.014301
Standard request
143,00 157,00 27,00 145,00 6,30
830.014302
Standard request
143,00 160,00 27,00 145,70 8,30
830.014601
Standard request
146,00 172,00 38,00 147,00 12,70
830.015002
Standard request
150,00 167,00 28,00 153,80 8,50
830.015001
Standard request
150,00 172,00 40,00 151,00 11,20
830.015201
Standard request
152,00 171,50 32,00 153,00 9,50
830.015301
Standard request
153,00 171,50 28,00 157,00 8,30
830.015406
Standard request
154,00 168,00 27,00 150,00 6,50
830.015403
Standard request
154,00 168,00 27,00 150,00 6,50
830.015407
Standard request
154,00 168,00 27,00 158,00 6,00
830.015408
Standard request
154,00 169,00 22,00 158,10 7,00
830.015402
Standard request
154,00 169,00 22,00 158,10 7,00
830.015401
Standard request
154,00 170,00 21,00 158,10 7,00
830.015409
Standard request
154,00 173,50 32,00 155,00 9,65
830.015501
Standard request
155,00 168,00 27,00 158,00 6,00
830.016301
Standard request
163,00 191,00 38,00 167,00 12,70
830.016302
Standard request
163,00 191,50 38,00 166,00 12,70
830.016401
Standard request
164,00 189,00 30,00 170,00 9,50
830.016502
Standard request
165,00 180,50 27,00 170,00 7,00
830.016501
Standard request
165,00 181,00 27,00 170,00 7,00
830.017101
Standard request
171,30 185,30 20,00 172,00 6,00
830.017601
Standard request
176,00 195,00 28,00 182,00 8,30
830.017701
Standard request
177,00 200,00 30,00 184,00 9,50
830.017801
Standard request
178,00 199,00 32,00 184,00 9,50
830.017805
Standard request
178,00 205,00 38,00 178,00 12,70
830.018201
Standard request
182,00 210,00 38,00 184,00 12,70
830.018203
Standard request
182,00 210,50 38,00 185,00 12,70
830.019202
Standard request
191,00 210,00 28,00 190,00 8,50
830.019203
Standard request
192,00 209,00 30,00 190,00 9,50
830.019201
Standard request
192,00 215,00 33,00 194,50 10,30
830.019501
Standard request
195,00 216,50 31,80 198,00 9,50
830.020001
Standard request
200,00 228,50 38,00 205,50 13,00
830.020501
Standard request
205,00 227,00 30,00 210,00 9,50
830.020503
Standard request
205,00 227,00 30,00 210,00 9,50
830.020504
Standard request
205,00 227,00 30,00 210,00 10,00
830.020805
Standard request
208,70 222,80 26,00 208,00 6,20
830.020501
Standard request
205,00 227,00 30,50
830.021601
Standard request
216,00 237,00 30,00 218,00 9,50
830.022001
Standard request
220,00 239,50 31,80 224,00 9,50
830.022307
Standard request
223,00 251,50 38,00 226,00 12,70
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