BECA 338

BECA 338
beca_338_3d_v1
beca_338_3d_v2

Description

The BECA 338 profile is a single acting symmetrical seal composed of a profiled, filled PTFE seal and two V-Shaped springs that are resistant to corrosion. Each of the springs acts individually on one of the seal's lips. This profile is particularly suited to applications where it is necessary to have a significant seal radial cross-section.

Advantages

Wide temperature range and excellent chemical resistance
Low friction coefficient; no stick-slip effect
Excellent abrasion resistance
Good dimensional stability
Non-toxic material

Technical data

Temperature

-200°C/+260°C

Pressure

30 MPa

Speed

15 m/s

Medias

Practically all types of fluids, and chemical and gas products

Applications

Food & Beverage
Measuring devices
Pumps
Separators
Valves

Materials

Profiled seal

Carbon-filled PTFE

V-Shaped spring

Stainless steel

Dimensions
Installation dimensions
Materials
Technical data

Dimensions

Installation drawingLogement Gorge Joint de tige Piston - Housing Groove Gland Rod piston seal BECA 338

Installation dimensions

Housing Groove Gland Rod/Piston Seal  - BECA 338

Installation dimensions

Cylinder sealing Rod sealing Groove width Groove width Radial section
Bore diameter
ØD1 H9
Groove diameter
Ød1 h9
Rod diameter
Ød1 h9
Groove diameter
ØD1 H9
L1 0/+0.20 L according to ISO S
25.0 - ** D1 - 25.00 25.0 - ** d1 + 25.00 9.00 16.00/20.00/40.00 12.50
25.0 - ** D1 - 30.00 25.0 - ** d1 + 30.00 9.00 20.00/25.00/50.00 15.00

For special applications > 30 MPa, we recommend using H8/f8 (bore/piston) and H8/f8 (groove/rod) tolerances or selecting other more suitable materials. Please contact our experts.

Materials

Profiled seal V-Shaped springs 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
I X10 Cr Ni 18-8 -200°C/+260°C Steel
Stainless steel
Chrome steel
Aluminium
Bronze
Cast iron
Treated surface
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

CG C PTFE
+ 23% Carbon
+ 2% Graphite
Black
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
Steel
Chrome steel
Cast iron
VM M PTFE
+ 15 % Glass
+ 5% MoS2
Grey
DX X GL Blue PTFE
+ Glass
+ Metal oxides
Turquoise blue Compression resistant
Wear resistant
Excellent chemical stability
Good thermal conductivity
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
Steel
Stainless steel
Chrome steel
Aluminium
Bronze
Cast iron
Treated surface
K1 K PTFE
+ 10% Ekonol
Light brown Improvement
  • Better abrasion resistance
  • Better dimensional stability at high temperatures
Use up to +300°C
Good friction coefficient and low permeability
K2 K PTFE
20% Ekonol
Light brown
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
Steel
Chrome steel
Cast iron
B4 B PTFE
+ 40% Bronze
Dark brown
HG HG PE-UHMW White or off-white Excellent wear resistance on contact with water and air I X10 Cr Ni 18-8 -70°C/+80°C Steel
Stainless steel
Chrome steel
Aluminium
Bronze
Cast iron
Treated surface

Other grades of materials are available depending on your specificities.

Technical data

Housing Groove Gland Rod/Piston Seal  - BECA 338

Extrusion gaps

Radial section
S
Radial extrusion gap
F/2
2 MPa 10 MPa 20 MPa 30 MPa
7.00 0.10 0.08 0.05 0.05
8.00 0.10 0.08 0.05 0.05
10.00 0.15 0.10 0.08 0.05
12.50 0.15 0.10 0.08 0.05
15.00 0.15 0.10 0.08 0.05

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
Chamfer
C
7.00 0.80 4.50
8.00 0.80 4.50
10.00 0.80 6.50
12.50 0.80 6.50
15.00 1.00 8.00
17 dimensions found
338.245422
Standard request
24,50 42,20 8,70 9,50
338.028042
Standard request
28,00 42,00 9,70 10,00
338.032052
Standard request
32,00 52,00 12,20 12,50
338.036052
Standard request
36,00 52,00 10,20 10,50
338.040056
Standard request
40,00 56,00 10,20 10,50
338.040060
Standard request
40,00 60,00 12,20 12,50
338.050070
Standard request
50,00 70,00 12,20 12,50
338.060080
Standard request
60,00 80,00 12,20 12,50
338.060085
Standard request
60,00 85,00 12,00 13,50
338.070090
Standard request
70,00 90,00 12,20 12,50
338.080096
Standard request
80,00 96,00 10,20 10,50
338.100116
Standard request
100,00 116,00 10,20 10,50
338.155180
Standard request
155,00 180,00 13,70 14,50
338.155185
Standard request
155,00 185,00 16,70 17,00
338.165190
Standard request
165,00 190,00 16,70 17,00
338.290320
Standard request
290,00 320,00 16,70 17,00
338.300235
Standard request
300,00 325,00 8,70 9,00