338 FRANCEJOINT | Alldatasheet
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QUALITY & EXPERTISE FOR YOUR SEALING NEEDS DESCRIPTION The BECA 338 profile is a single acting symmetrical seal composed of a profiled, filled PTFE seal and two V-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 APPLICATIONS Food & Beverage Measuring devices Pumps Separators Valves MATERIALS Profiled seal Carbon-filled PTFE V-Shaped springs Stainless steel Other materials are available. Please refer to the materials table on the next page. | TECHNICAL DATA Temperature -200°C / +260°C Pressure 30 MPa Speed 15 m/s Media Practically all types of fluids, and chemical and gas products The figures above indicate the maximum values and may not be cumulated. They may be developed, depending on the materials used. | EXTRUSION GAPS Radial section S Radial gap F/2
2 MPa 10 MPa 20 MPa 30 MPa
| 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 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 PISTON/ROD SEALS BECA 338 HYDRAULIC SEALS | PISTON/ROD SEALS | BECA 338
www.francejoint.com | TABLE MATERIALS Other grades of materials are available depending on your specificities. Profiled seal V-springs Mating surface materialStandard code ISO code Material Colour Characteristics Code Type of material Service temperature DP P Virgin PTFE White Resistance to chemical products Impermeability Dielectric Non-stick Low friction coefficient Food industry 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 Improvements
- Wear properties
- Compression set Good resistance to chemical products Thermal and electrical conductivity Anti-static High-performing in compression-based dynamic applications I X10 Cr Ni 18-8 -200°C/+260°C CG C PTFE + 23% Carbon + 2% Graphite Black I X10 Cr Ni 18-8 -200°C/+260°C DV V PTFE + 25 % Glass Blue Improvements
- Wear properties
- Mechanical strength Slightly more abrasive, however, this is corrected by adding MOS2 Maintains its chemical and dielectric properties Well-suited to applications with rotational and simultaneous alternating movements I X10 Cr Ni 18-8 -200°C/+260°C Steel Chrome steel Cast iron VM M PTFE + 15 % Glass + 5% MOS2 Grey I X10 Cr Ni 18-8 -200°C/+260°C DX X PTFE GL Blue + Glass + Metal oxides Turquoise blue Resistance to compression Resistance to wear Excellent chemical stability Good thermal conductivity I X10 Cr Ni 18-8 -200°C/+260°C DG G PTFE + 15% Graphite Black Improvements
- Wear properties Reduced wear on metal parts Self-lubricating Thermal and electrical conductivity Low permeability Good friction coefficient Anti-static High performing in dynamic self-lubricating
applications
I X10 Cr Ni 18-8 -200°C/+260°C Steel Stainless steel Chrome steel Aluminium Bronze Cast iron Treated surfaceK1 K PTFE + 10% Ekonol Light brown Improvements
- Better abrasion resistance
- Better dimensional stability at high temperatures Use up to +300°C Good friction coefficient and low permeability I X10 Cr Ni 18-8 -200°C/+260°C K2 K PTFE + 20% Ekonol Light brown I X10 Cr Ni 18-8 -200°C/+260°C DB B PTFE + 60% Bronze Dark brown Improvements
- Wear properties
- Warping resistance and creep strength
- Compression resistance Self-lubricating Electrical and thermal conductivity Does not alter the metal parts Reduced hold with certain chemical products Used for high-compression dynamic seals and has a low level of wear I X10 Cr Ni 18-8 -200°C/+260°C Steel Chrome steel Cast ironB4 B PTFE + 40% Bronze Dark brown I X10 Cr Ni 18-8 -200°C/+260°C 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 HYDRAULIC SEALS | PISTON/ROD SEALS | BECA 338
ØD1 R1L1 SØd1 F_2 ØA 30° 30° ØD1 SØd1 ØA F_2 BECA 339 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 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. * The codes that define the materials are set out in the materials table. | EXAMPLE OF CODIFICATION STANDARD CODIFICATION Materials ________ : PTFE + 25% Carbon profiled seal - Code ISO C Groove diameter / Bore diameter ____________ : ØD1 = 70.00 mm Part number ______: 338.050070C Family Rod diameter / Groove diameter: Groove diameter / Bore diameter Profiled seal material* 338. 050 070 CPart number - | DIMENSIONS Part number Rod diameter Ød1 h9 Groove diameter Ød1 h9 Groove diameter ØD1 H9 Bore diameter ØD1 H9 Seal height Groove width 0/+0.20 Part number Rod diameter Ød1 h9 Groove diameter Ød1 h9 Groove diameter ØD1 H9 Bore diameter ØD1 H9 Seal height Groove width 0/+0.20 The figures highlighted in bold correspond to the rod diameters and bore diameters that are recommended by standard ISO 3320. Other intermediate sizes can be provided. FRANCE JOINT SAS Zone Artisanale Le Mortier - B.P . 50009 - Cugand - 85613 Montaigu Cedex - France Ph. +33 (0)2 51 42 13 76 - Fax +33 (0)2 51 43 61 14 - Email: contact@francejoint.fr - Website: www.francejoint.com HYDRAULIC SEALS | PISTON/ROD SEALS | BECA 338