EN
My account
Create an account Log in
Search
Telephone

+33 (0)2 51 42 13 76

BECA 841 - 843

BECA 841 - 843
BECA 841 - 843
beca_841_3d_v1
beca_841_3d_v2

Description

The BECA 841 - 843 roto seals are single or double acting piston rotary seals composed of a filled PTFE grooved friction ring and a pre-tightened rubber O'Ring.

Advantages

Low friction coefficient; no stick-slip effect on start up
Excellent abrasion and extrusion resistance
The grooves provide an integrated lubrication system
Excellent dimensional stability

Technical data

Temperature

-30°C/+200°C

Pressure

30 MPa

Speed

2 m/s

Medias

Mineral hydraulic oils
Fire-resistant liquids
Biocompatible fluids
Water
Others (contact our experts)

Applications

Rotary distributors
Handlers
Hydraulic motors

Materials

Friction ring

Bronze-filled PTFE
Carbon-filled PTFE
Virgin PTFE

O'Ring

NBR 70 Shore A
FKM 70 Shore A

Dimensions
Installation dimensions
Materials
Technical data

Dimensions

843.008, 843.009, 843.010, 843.012, 841.014, 843.014, 841.015, 843.015, 841.016, 843.016, 841.018, 843.018, 841.020, 843.020, 841.022, 843.022, 841.025, 843.025, 841.028, 843.028, 841.030, 843.030, 841.032, 843.032, 841.035, 843.035, 841.038, 843.038, 841.040, 843.040, 841.042, 843.042, 841.045, 843.045, 841.048, 843.048, 841.050, 843.050, 841.052, 843.052, 841.055, 843.055, 841.058, 843.058, 841.060, 843.060, 841.062, 843.062, 841.063, 843.063, 841.065, 843.065, 841.070, 843.070, 841.072, 843.072, 841.075, 843.075, 841.078, 843.078, 841.080, 843.080, 841.082, 843.082, 841.085, 843.085, 841.090, 843.090, 841.095, 843.095, 841.100, 843.100, 841.105, 843.105, 841.110, 843.110, 841.115, 843.115, 841.120, 843.120, 841.125, 843.125, 841.130, 843.130, 841.135, 843.135, 841.140, 843.140, 841.145, 843.145, 841.150, 843.150, 841.155, 843.155, 841.160, 843.160, 841.165, 843.165, 841.170, 843.170, 841.175, 843.175, 841.180, 843.180, 841.190, 843.190, 841.200, 843.200, 841.210, 843.210, 841.220, 843.220, 841.230, 843.230, 841.240, 843.240, 841.250, 843.250, 841.260, 843.260, 841.270, 843.270, 841.280, 843.280, 841.290, 843.290, 841.300, 843.300, 841.310, 843.310, 841.320, 843.320, 841.330, 843.330, 841.340, 843.340, 841.350, 843.350, 841.360, 843.360, 841.370, 843.370, 841.380, 843.380, 841.390, 843.390, 841.400, 843.400, 841.410, 843.410, 841.420, 843.420, 841.430, 843.430, 841.440, 843.440, 841.450, 843.450, 841.460, 843.460, 841.470, 843.470, 841.480, 843.480, 841.490, 843.490, 841.500, 843.500, 841.550, 843.550, 841.600, 843.600, 841.650, 843.650, 843.700, 843.750, 843.800, 843.850, 843.900, 843.950
Installation drawingLogement Gorge Rotojoint de piston - Housing Groove Piston rotoseal - BECA 841 - 843

Installation dimensions

Housing Groove Piston Rotoseal - BECA 841 - 843

Installation dimensions

Bore diameter
ØD1 H9		 Groove diameter Groove width Radial section O'Ring
cross-section		 Number
of grooves
BECA 843
Standard
series		 BECA 841
Heavy-duty
series		 Ød1 h9 L1 0/+0.20 S Ød2
8.0 - 39.9 --- D1 - 4.90 2.20 2.45 1.78 1
40.0 - 79.9 14.0 - 39.9 D1 - 7.50 3.20 3.75 2.62 1
80.0 - 132.9 40.0 - 79.9 D1 - 11.00 4.20 5.50 3.53 2
133.0 - 329.9 80.0 - 132.9 D1 - 15.50 6.30 7.75 5.33 2
330.0 - 669.9 133.0 - 329.9 D1 - 21.00 8.10 10.50 6.99 2
670.0 - 999.9 330.0 - 669.9 D1 - 28.00 9.50 14.00 8.40 2

For special applications > 20 MPa, we recommend using an H8/f8 tolerance (bore/groove) or selecting other more suitable materials. Please contact our experts.

Materials

Friction ring O'Ring Contact surface area
Standard code ISO code Material Colour Characteristics Code Type of material Service temperature
DP P Virgin PTFE White Resistance to chemical products
Sealing water
Dielectric
Non-stick
Low friction coefficient
Food & Beverage		 K6 NBR 70 Shore A -30°C/+100°C Steel
Stainless steel
Chrome steel
Aluminium
Bronze
Cast iron
Treated surface
G6 FKM 70 Shore A -20°C/+200°C
C6 EPDM 70 Shore A -45°C/+150°C
F6 VMQ 70
Shore A 		-60°C/+200°C
DC C PTFE
+25% Carbon		 Grey

Improvement

  • Wear properties
  • Compression set

Good resistance to chemical products
Thermal and electrical conductivity
Anti-static

Efficient as part of dynamic
applications with compression

 K6 NBR 70 Shore A -30°C/+100°C
G6 FKM 70 Shore A -20°C/+200°C
C6 EPDM 70 Shore A -45°C/+150°C
CG C PTFE
+ 23% Carbon
+ 2% Graphite		 Black K6 NBR 70 Shore A -30°C/+100°C
G6 FKM 70 Shore A -20°C/+200°C
C6 EPDM 70 Shore A -45°C/+150°C
DV V PTFE
+ 25 % Glass		 Blue Improvement
  • Wear properties
  • Mechanical strength
Slightly more abrasive but can be
corrected with the addition of MOS2
Chemical and dielectric properties preserved

Well suited to applications with
rotating and simultaneous alternating movements		 K6 NBR 70 Shore A -30°C/+100°C Steel
Chrome steel
Cast iron
G6 FKM 70 Shore A -20°C/+200°C
VM M PTFE
+ 15 % Glass
+ 5% MoS2		 Grey K6 NBR 70 Shore A -30°C/+100°C
G6 FKM 70 Shore A -20°C/+200°C
DG G PTFE
+ 15% Graphite		 Black Improvement
  • Wear properties
Reduced wear on metal parts
Self-lubricating
Thermal and electrical conductivity
Low permeability
Good friction coefficient
Anti-static

Efficient as part of dynamic
dynamic applications with self-lubrication		 K6 NBR 70 Shore A -30°C/+100°C Steel
Stainless steel
Chrome steel
Aluminium
Bronze
Cast iron
Treated surface
G6 FKM 70 Shore A -20°C/+200°C
C6 EPDM 70 Shore A -45°C/+150°C
DB B PTFE
+ 60% Bronze		 Dark brown Improvement
  • Wear properties
  • Deformation and creep resistance
  • Compression resistant
Self-lubricating
Electrical and thermal conductivity
Does not alter metal parts
Reduced resistance to certain chemical products

Used for dynamic seals with a strong compression and low level of wear		 K6 NBR 70 Shore A -30°C/+100°C Steel
Chrome steel
Cast iron
G6 FKM 70 Shore A -20°C/+200°C

Other grades of materials are available depending on your specificities.

Technical data

Housing Groove Piston Rotoseal - BECA 841 - 843

Extrusion gaps

Radial section
S		 Radial extrusion gap
F/2
10 MPa 20 MPa 30 MPa
2.45 0.15 0.10 0.05
3.75 0.20 0.15 0.10
5.50 0.25 0.20 0.15
7.75 0.30 0.25 0.20
10.50 0.30 0.25 0.20
14.00 0.45 0.30 0.25

Surface roughness

Roughness Dynamic surface area Static surface area
Ra 0.05 - 0.2 µm ≤ 1.6 µm
Rz 0.4 - 1.6 µm ≤ 10.0 µm
Rmax 0.63 - 2.5 µm ≤ 16.0 µm

Chamfers and radius

Radial section
S		 Radius
R1		 Radius
R2		 Chamfer
C
2.45 0.20 0.40 2.00
3.75 0.20 0.60 2.50
5.50 0.20 1.00 3.50
7.75 0.20 1.30 5.00
10.50 0.20 1.80 6.50
14.00 0.20 2.50 7.50
180 dimensions found
841.175
Standard request
 175,00 154,00 8,10
843.175
Standard request
 175,00 159,50 6,30
841.180
Standard request
 180,00 159,00 8,10
843.180
Standard request
 180,00 164,50 6,30
841.190
Standard request
 190,00 169,00 8,10
843.190
Standard request
 190,00 174,50 6,30
841.200
Standard request
 200,00 179,00 8,10
843.200
Standard request
 200,00 184,50 6,30
841.210
Standard request
 210,00 189,00 8,10
843.210
Standard request
 210,00 194,50 6,30
841.220
Standard request
 220,00 199,00 8,10
843.220
Standard request
 220,00 204,50 6,30
841.230
Standard request
 230,00 209,00 8,10
843.230
Standard request
 230,00 214,50 6,30
841.240
Standard request
 240,00 219,00 8,10
843.240
Standard request
 240,00 224,50 6,30
841.250
Standard request
 250,00 229,00 8,10
843.250
Standard request
 250,00 234,50 6,30
841.260
Standard request
 260,00 239,00 8,10
843.260
Standard request
 260,00 244,50 6,30
841.270
Standard request
 270,00 249,00 8,10
843.270
Standard request
 270,00 254,50 6,30
841.280
Standard request
 280,00 259,00 8,10
843.280
Standard request
 280,00 264,50 6,30
841.290
Standard request
 290,00 269,00 8,10
843.290
Standard request
 290,00 274,50 6,30
841.300
Standard request
 300,00 279,00 8,10
843.300
Standard request
 300,00 284,50 6,30
841.310
Standard request
 310,00 289,00 8,10
843.310
Standard request
 310,00 294,50 6,30
841.320
Standard request
 320,00 299,00 8,10
843.320
Standard request
 320,00 304,50 6,30
841.330
Standard request
 330,00 302,00 9,50
843.330
Standard request
 330,00 309,00 8,10
841.340
Standard request
 340,00 312,00 9,50
843.340
Standard request
 340,00 319,00 8,10
841.350
Standard request
 350,00 322,00 9,50
843.350
Standard request
 350,00 329,00 8,10
841.360
Standard request
 360,00 332,00 9,50
843.360
Standard request
 360,00 339,00 8,10
841.370
Standard request
 370,00 342,00 9,50
843.370
Standard request
 370,00 349,00 8,10
841.380
Standard request
 380,00 352,00 9,50
843.380
Standard request
 380,00 359,00 8,10
841.390
Standard request
 390,00 362,00 9,50
843.390
Standard request
 390,00 369,00 8,10
841.400
Standard request
 400,00 372,00 9,50
843.400
Standard request
 400,00 379,00 8,10
841.410
Standard request
 410,00 382,00 9,50
843.410
Standard request
 410,00 389,00 8,10
841.420
Standard request
 420,00 392,00 9,50
843.420
Standard request
 420,00 399,00 8,10
841.430
Standard request
 430,00 402,00 9,50
843.430
Standard request
 430,00 409,00 8,10
841.440
Standard request
 440,00 412,00 9,50
843.440
Standard request
 440,00 419,00 8,10
841.450
Standard request
 450,00 422,00 9,50
843.450
Standard request
 450,00 429,00 8,10
841.460
Standard request
 460,00 432,00 9,50
843.460
Standard request
 460,00 439,00 8,10
841.470
Standard request
 470,00 442,00 9,50
843.470
Standard request
 470,00 449,00 8,10
841.480
Standard request
 480,00 452,00 9,50
843.480
Standard request
 480,00 459,00 8,10
841.490
Standard request
 490,00 462,00 9,50
843.490
Standard request
 490,00 469,00 8,10
841.500
Standard request
 500,00 472,00 9,50
843.500
Standard request
 500,00 479,00 8,10
841.550
Standard request
 550,00 522,00 9,50
843.550
Standard request
 550,00 529,00 8,10
841.600
Standard request
 600,00 572,00 9,50
843.600
Standard request
 600,00 579,00 8,10
841.650
Standard request
 650,00 622,00 9,50
843.650
Standard request
 650,00 629,00 8,10
843.700
Standard request
 700,00 672,00 9,50
843.750
Standard request
 750,00 722,00 9,50
843.800
Standard request
 800,00 772,00 9,50
843.850
Standard request
 850,00 822,00 9,50
843.900
Standard request
 900,00 872,00 9,50
843.950
Standard request
 950,00 922,00 9,50
   1 2