

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 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



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

ROTO SEALS

BECA

841-843

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

TECHNICAL DATA

Temperature

-30°C / +200°C

Pressure

30 MPa

Speed

2 m/s

Media

Mineral hydraulic oils

Fire-resistant liquids

Biocompatible fluids

Water

Others (contact our experts)

The figures above indicate the maximum values and may not be cumulated. They may be

developed, depending on the materials used.

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

EXTRUSION GAPS

Radial section

S

Radial gap

F/2

10 MPa

20 MPa

2.45

0.15

0.10

3.75

0.20

0.15

5.50

0.25

0.20

7.75

0.30

0.25

10.50

0.30

0.25

14.00

0.45

0.30

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

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

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

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

17.50

ROTARY SEALS | ROTO SEALS |

BECA 841 - 843

QUALITY & EXPERTISE FOR YOUR SEALING NEEDS