QUALITY & EXPERTISE FOR YOUR SEALING NEEDS



EXTRUSION GAPS

Radial section

S

Radial gap

F/2

2 MPa

10 MPa

20 MPa

35 MPa

1.45

0.10

0.10

0.08

0.05

2.25

0.15

0.15

0.10

0.07

3.10

0.25

0.20

0.15

0.08

4.70

0.35

0.25

0.20

0.10

6.10

0.50

0.30

0.25

0.15

7.50

0.60

0.40

0.30

0.20



SURFACE ROUGHNESS

Roughness

Dynamic surface area

Static surface area

Groove flanks

Ra

0.05 - 0.2 µm

≤1.6 µm

≤3.2 µm

Rz

0.4 - 1.6 µm

≤6.3 µm

≤10.0 µm

Rmax

0.63 - 2.5 µm

≤10.0 µm

≤16.0 µm



CHAMFERS AND RADIUS

Radial section

S

Radius

R1

Radius

R2

Chamfer

C

1.45

0.30

0.40

2.00

2.25

0.30

0.40

2.00

3.10

0.30

0.60

3.00

4.70

0.30

0.80

3.00

6.10

0.30

0.80

5.00

7.50

0.30

1.00

6.00



DESCRIPTION

The BECA 550-559 profiles are

double acting composite piston seals

composed of a filled PTFE friction

ring and pre-tightened rubber O'Ring.

They can be mounted in the grooves

of the O'Rings. Option of connecting

the seal to 1 or 2 back-up rings.



ADVANTAGES

Suitable for a reduced size

Low friction coefficient;

no stick-slip effect

Excellent extrusion and wear resistance

Wide temperature range and excellent

chemical resistance, depending on

the material selected for the O'Ring



APPLICATIONS

Machine tools

Lifting systems

Valves



MATERIALS

Friction ring

Bronze-filled PTFE

Carbon-filled PTFE

Blue GL PTFE

O'Ring

NBR 70 Shore A

FKM 70 Shore A

Other grades of materials are

available. Please refer to the

materials table on the next page.



TECHNICAL DATA

Temperature

-30°C / +200°C

Pressure

35 MPa

Speed

5 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.

PISTON SEALS

BECA

550-559

HYDRAULIC SEALS | PISTON SEALS |

BECA 550 - 559