Material: Coupling seal (GSD /TWF/TWO): Thread seal (GD): Working press.: Working temp.: steel, brass, nickel-plated brass, aluminium Hypalon - for steel NBR - for other s PTFE - for steel Polyurethane - for other s From 0.8 bar to 16 bar From -20 C to +100 C (allow for medium and sealing TW (Tankwagen) couplings made according to EN ISO 14420-6 (previous DIN 28450) are also called tanker couplings or eurocouplings. Designed to transfer liquid, solid and gaseous products (except liquid gas and steam). Used in reloading applications in petrochemical, chemical and food industry. TW coupling consists of MK part and VK part. Both parts are locked together by a turn of the couplings and then secured by a locking handle. The handle prevents turning and uncoupling of the parts. A plug VB (for MK part) and a cap MB (for VK part) are resistant to pressure. If the installation operates constantly under pressure, it is required to use safety locks. The main seal for this type of coupling is GSD moulded seal as a standard (TWO O-ring for 4 ). There is TWF flat seal (TWO for 4 ) used in MB caps. TWF seal can be used instead of GSD. The thread is sealed with GD flat seal. Standard seals are supplied with couplings. Seals made of other s are also available (see the table). When selecting a proper coupling for the medium it is required to check the corrosion resistance of its, sealing and temperature impact. It is recommended to use TW couplings coated with ECTFE for highly aggressive media. seal symbol colour gasket type temperature range (approximate) polyurethane (PUR, Vulkollan) VU blue GSD, TWF, GD from -20 C up to +70 C nitrile (NBR, Perbunan) PE black GSD, TWO, TWF from -20 C up to +70 C Hypalon (CSM) HY green GSD, TWO, TWF from -20 C up to +130 C Viton (FPM) VI black with red dot GSD, TWO, TWF, GD from -20 C up to +120 C PTFE (PTFE) TE white TWO, TWF, GD from -20 C up to +220 C PTFE / Viton TEVI white (encapsulated) TWO, TWF from -20 C up to +220 C EPDM EP black TWF, GD from -20 C up to +100 C Vamac BIT two red dots GSD up to +200 C KRS fitting MK coupling (MKV + MKH) VK coupling KRS fitting GD GSD TWF GD RS safety VB plug MB cap RS safety 327
There are two versions of TW couplings available: - couplings made by Roman Seliger (EN ISO 14420-6), designed for the most demanding industrial applications, available with 3.1 certificate on request, manufactured to the highest quality standards. Marked with a standard code e.g. TW-MKV-050MS. - ECONOMY - economical version of couplings, for general industrial application. Marked with a code with the letter X added at the end, e.g. TW-MKV-050MSX. VK and MK part of a coupling have BSP female threads whose size corresponds to the size of the coupling (2, 3 and 4 ). They can be mounted on fittings with matching BSP male thread: - KRS fittings designed for rubber and plastic hoses, assembled with RS-636... safety s, matched to the hose diameter and wall thickness, - KKW fittings designed for rubber and plastic hoses, assembled with worm-drive s, - VSL fittings with BSP male thread designed for rubber and plastic hoses, supplied as a set with RS-636... aluminium safety s, - DT-KGZ-... composite hose fittings, - TB-AF1-... steel hose fittings, - other fittings and adaptors with adequate BSP male thread. VKS2 and MKS2 couplings are supplied as a set with RS-636... aluminium safety s. VKS1 and MKS1 are one-piece couplings with an integrated hose fitting (no threaded connection). Supplied as a set with RS-636... aluminium safety s. VKS1 couplings have KSR polyamide safety ring. VB plugs and MB caps are supplied without a chain that links each of them with proper coupling part. KN chain must be ordered separately. There are no tools needed to join the coupling parts (MK with VK). TS wrench is used to mount the couplings on hoses and then on an installation. picture code thread size hose DN Fitting with male thread with hose tail TW-KKW-025-MS 1 25 brass TW-KKW-050-MS 2 50 brass TW-KKW-75-MS 3 75 brass KKW Fitting with male thread for RS safety assembly KRS TW-KKW-080-MS 3 80 brass TW-KKW-100-MS 4 100 brass TW-KRS-025-MS 1 25 brass TW-KRS-032-MS 1.1/4 32 brass TW-KRS-038-MS 1.1/2 38 brass TW-KRS-050-MS 2 50 brass TW-KRS-050-SS 2 50 TW-KRS-063-MS 2.1/2 63 brass TW-KRS-075-MS 3 75 brass TW-KRS-075-SS 3 75 TW-KRS-100-MS 4 100 brass TW-KRS-100-SS 4 100 328
picture code size VK coupling with female thread TW-VK-050-SS TW-VK-050-SSX VK 50-2 0,31 TW-VK-050-MS (TW 1501) TW-VK-050-MSX brass 0,36 TW-VK-080-SS 0,73 TW-VK-080-SSX VK 80-3 TW-VK-080-MS (TW 501) brass 0,75 TW-VK-080-MSX TW-VK-080-AL aluminium 0,27 TW-VK-100-SS 1,15 TW-VK-100-SSX VK 100-4 TW-VK-100-MS VK brass 1,10 TW-VK-100-MSX Sealing ring TW-MKV-050-SS TW-MKV-050-SSX MKV - 2 0,22 TW-MKV-050-MS (TW 1502) TW-MKV-050-MSX brass 0,24 TW-MKV-080-SS 0,51 TW-MKV-080-SSX MKV - 3 TW-MKV-080-MS (TW 502) brass 0,55 TW-MKV-080-MSX MKV TW-MKV-080-AL aluminium 0,20 TW-MKH-050-SS Clamping ring with handle 0,47 TW-MKH-050-SSX MKH - 2 TW-MKH-050-NI nickel plated brass 0,47 (TW 1503) TW-MKH-050-MS brass 0,49 TW-MKH-050-MSX TW-MKH-080-SS TW-MKH-080-SSX 0,94 TW-MKH-080-NI MKH - 3 nickel plated brass 0,99 MKH TW-MKH-080-MS (TW 503) TW-MKH-080-MSX brass 1,00 TW-MKH-080-AL aluminium 0,39 TW-MK-050-SS 0,69 MK coupling with female thread MK TW-MK-050-SSNI MK 50-2 (TW 1502) nickel plated brass 0,69 TW-MK-050-MS brass 0,73 TW-MK-080-SS 1,45 TW-MK-080-SSNI MK 80-3 1,50 nickel plated brass (TW 502) TW-MK-080-MS brass 1,55 TW-MK-080-AL aluminium 0,59 TW-MK-100-SS TW-MK-100-SSX 2,75 TW-MK-100-SSNI MK 100-4 nickel plated brass 2,75 TW-MK-100-MS TW-MK-100-MSX brass 2,75 329
picture code size hose DN One piece VK coupling with RS safety TW-VKS1-050-SS 0,83 VKS 50-2 50x8 mm TW-VKS1-050-MS brass 0,96 TW-VKS1-080-SS 1,80 VKS 80-3 75x8 mm TW-VKS1-080-MS brass 2,05 VKS 1 One piece MK coupling with RS safety MKS 1 Two part VK coupling with RS safety VKS 2 Two part MK coupling with RS safety MKS 2 TW-VKS1-100-MS VKS 100-4 100x8 mm brass 3,50 TW-MKS1-050-SS 1,10 TW-MKS1-050-SSNI MKS 50-2 50x8 nickel plat. brass 1,15 TW-MKS1-050-MS brass 1,10 TW-MKS1-080-SS 2,25 TW-MKS1-080-SSNI MKS 80-3 75x8 nickel plat. brass 2,30 TW-MKS1-080-MS brass 2,35 TW-MKS1-100-MS MKS 100-4 100x8 brass 4,75 TW-VKS2-050032-SS 0,88 32x6 TW-VKS2-050032-MS brass 0,85 TW-VKS2-050038-SS 0,82 VKS 50-2 38x6,5 TW-VKS2-050038-MS brass 0,89 TW-VKS2-050050-SS 0,92 50x8 TW-VKS2-050050-MS brass 1,10 TW-VKS2-080063-SS 63x8 2,10 TW-VKS2-080063-MS 65x7 brass 2,10 TW-VKS2-080075-SS 1,85 TW-VKS2-080075-MS VKS 80-3 75x8 brass 2,20 TW-VKS2-080075-AL aluminium 1,10 TW-VKS2-080080-SS 1,85 80x8 TW-VKS2-080080-MS brass 2,05 TW-VKS2-100100-SS 3,85 VKS 100-4 100x8 TW-VKS2-100100-MS brass 4,35 TW-MKS2-050032-SS 1,25 32x6 TW-MKS2-050032-MS brass 1,20 TW-MKS2-050038-SS 1,20 MKS 50-2 38x6,5 TW-MKS2-050038-MS brass 1,25 TW-MKS2-050050-SS 1,30 50x8 TW-MKS2-050050-MS brass 1,45 TW-MKS2-080063-SS 63,8 2,70 TW-MKS2-080063-MS 65x7 brass 2,75 TW-MKS2-080075-SS 2,55 TW-MKS2-080075-MS MKS 80-3 75x8 brass 3,00 TW-MKS2-080075-AL aluminium 1,40 TW-MKS2-080080-SS 2,55 80x8 TW-MKS2-080080-MS brass 2,85 TW-MKS2-100100-SS 5,45 MKS 100-4 100x8 TW-MKS2-100100-MS brass 6,00 330
Cap Plug picture code size MB VB TW-MB-050-SS TW-MB-050-SSX 0,30 TW-MB-050-MS MB 50 TW-MB-050-MSX (TW 1506) brass 0,35 TW-MB-050-AL TW-MB-050-ALX aluminium 0,14 TW-MB-080-SS TW-MB-080-SSX 0,66 TW-MB-080-MS MB 80 TW-MB-080-MSX (TW 506) brass 0,87 TW-MB-080-AL TW-MB-080-ALX aluminium 0,30 TW-MB-100-SS TW-MB-100-SSX 1,20 TW-MB-100-MSX MB 100 brass 1,25 TW-MB-100-AL TW-MB-100-ALX aluminium 0,45 TW-VB-050-SS TW-VB-050-SSX 0,31 TW-VB-050-MS VB 50 TW-VB-050-MSX (TW 1507) brass 0,32 TW-VB-050-AL TW-VB-050-ALX aluminium 0,13 TW-VB-080-SS TW-VB-080-SSX 0,76 TW-VB-080-MS VB 80 TW-VB-080-MSX (TW 507) brass 0,85 TW-VB-080-AL TW-VB-080-ALX aluminium 0,25 TW-VB-100-SS 1,15 TW-VB-100-SSX VB 100 TW-VB-100-AL aluminium 0,44 TW-VB-100-ALX picture code length Chain KN TW-KN-200-SS 200 AISI 305 0,002 TW-KN-200-MS 200 brass 0,002 TW-KN-300-SS 300 AISI 305 0,002 TW-KN-300-MS 300 brass 0,003 TW-KN-350-SS 350 AISI 305 0,003 TW-KN-350-MS 350 brass 0,003 picture code size Wrench TW-TS-050 TS 50-2 steel 0,93 TS TW-TS-080 TS 80-3 steel 1,35 TW-TS-100 TS 100-4 steel 2,35 331
MB cap seal Coupling seal picture code size TWF DN TW-TWF-050-VU polyurethane 0,007 TW-TWF-050-PE NBR 0,007 TW-TWF-050-VI Viton 0,010 TWF 2 50 TW-TWF-050-HY Hypalon 0,007 TW-TWF-050-TE PTFE 0,011 TW-TWF-050-TEPE PTFE / NBR 0,010 TW-TWF-080-VU polyurethane 0,016 TW-TWF-080-PE NBR 0,016 TW-TWF-080-VI Viton 0,022 TWF 3 80 TW-TWF-080-HY Hypalon 0,018 TW-TWF-080-TE PTFE 0,025 TW-TWF-080-TEPE PTFE / NBR 0,024 TW-TWO-100-PE NBR 0,016 TW-TWO-100-VI Viton 0,027 Coupling seal Thread seal TWO GSD GD TW-TWO-100-HY TWO 4 100 Hypalon 0,020 TW-TWO-100-TE PTFE 0,026 TW-TWO-100-TEPE PTFE / NBR 0,028 TW-GSD-050-VU polyurethane 0,008 TW-GSD-050-PE NBR 0,009 GSD 2 50 TW-GSD-050-VI Viton 0,012 TW-GSD-050-HY Hypalon 0,011 TW-GSD-080-VU polyurethane 0,015 TW-GSD-080-PE NBR 0,018 TW-GSD-080-VI GSD 3 80 Viton 0,026 TW-GSD-080-HY Hypalon 0,022 TW-GSD-080-BIT Vamac 0,015 TW-GD-050-VU polyurethane 0,004 TW-GD-050-VI Viton 0,003 GD 2 50 TW-GD-050-TE PTFE 0,004 TW-GD-050-EP EPDM 0,004 TW-GD-065-VU polyurethane 0,005 TW-GD-065-VI GD 2.1/2 65 Viton 0,006 TW-GD-065-TE PTFE 0,007 TW-GD-080-VU polyurethane 0,006 TW-GD-080-VI Viton 0,008 GD 3 80 TW-GD-080-TE PTFE 0,006 TW-GD-080-EP EPDM 0,006 TW-GD-100-VU polyurethane 0,009 TW-GD-100-VI Viton 0,014 GD 4 100 TW-GD-100-TE PTFE 0,009 TW-GD-100-EP EPDM 0,009 332
lined couplings liner coated couplings resist the most aggressive chemicals, even so corrosive that the couplings made of acid resistant steel fail. When corrosion is the case, it is recommended to use either expensive couplings made of special nickel-based alloys (e.g. Hastelloy) or (not so expensive) steel couplings with powder coated liner. is a copolymer of ethylene and chlorotrifluoroethylene, known under the brand name Halar. It is highly resistant to chemicals over a wide temperature range (approximately from -40 C to +130 C). Resistant to all acids, lye and other aggressive media (ph range 1 14). Very good mechanical properties, especially hardness and abrasion resistance. coatings have exceptional surface smoothness. The coating made of is about 0.5 0.6 mm thick. There are two special versions also available: a conductive version (R<10 6 Ω) and the one compliant with FDA requirements for food transfer. Several types of industrial couplings can be coated with e.g.: - TW couplings, - CAMLOCK couplings, - flanges, - threaded couplings and adaptors, - composite hose fittings, - breakaway couplings. MK coupling with female thread VK coupling with female thread picture code size MK VK Fitting with male tread for RS safety assembly KRS TW-MK-050-SSE TW-MK-080-SSE MK 50-2 (TW 1502) MK 80-3 (TW 502) TW-MK-100-SSE MK 100-4 TW-VK-050-SSE TW-VK-080-SSE VK 50 G 2 (TW 1501) VK 080 G 3 (TW 501) TW-VK-100-SSE VK 100 G 4 TW-KRS-050-SSE DN 50-2 TW-KRS-075-SSE DN 75-3 VB plug and MB caps are also available with liner. TW-KRS-100-SSE DN 100-4 0,69 1,45 2,75 0,31 0,73 1,15 - - - 333