Filter, ventilation and pressure protection systems for rail vehicles – developed and manufactured in Weiden and Roding.
Krapf & Lex Nachf. Verkehrstechnik GmbH & Co. KG
Weiden i. d. OPf. · RodingNew on Amplifa
About Krapf & Lex
Krapf & Lex Nachf. Verkehrstechnik GmbH & Co. KG has been developing and producing air filter systems, ventilation grilles and pressure protection solutions for fresh and exhaust air systems in rail vehicles for over 50 years. The portfolio includes multi-cyclones and cyclone filters for dust separation, snow filters, water protection systems and pressure protection systems for high-speed trains. The components are used in air-conditioning and ventilation systems as well as in cooling air systems of locomotives and passenger coaches. Production takes place in Roding (93426) and includes metalworking with welding robots, adhesive bonding processes in accordance with DIN EN 17460, painting and final assembly; design with 3D data and samples is based in Weiden (92637). To support integration, the technicians accompany customers from consulting through to final implementation. The company supplies international manufacturers and operators such as Alstom, Stadler, Siemens, Hitachi, Deutsche Bahn, ÖBB and SNCF and, with a delivery reliability of over 95 percent, has been fully digitally organized under ERP control since 2025.
- Site
- Roding
- Processes
- Production of air filter systems for rail vehicles, Multi-cyclones / cyclone filters, Snow filters, Pressure protection systems for high-speed trains, Manufacture of ventilation grilles, Manufacture of doors, side wall and front flaps, Metalworking, Welding (processes 131, 135, 141, 21 according to DIN EN ISO 4063)
- Materials
- Base material group 1.2 (unalloyed steels), Base material group 8 (austenitic Cr-Ni steels), Base material group 22 (aluminium), Base material group 23 (aluminium alloys), Unalloyed steels, Austenitic Cr-Ni steels (stainless steel), Aluminium and aluminium alloys
- Certificates
- DIN ISO 9001:2015, DIN EN 15085-2, DIN EN 17460, DIN EN ISO 3834-2:2021, DIN EN ISO 3834-2
- Founded
- 1949
- Industries
- Rail vehicle construction, Rail industry (HVAC/air-conditioning and ventilation systems, cooling air, Rail industry (HVAC/air-conditioning and ventilation systems, cooling air
- 01
Design / Engineering (3D data, samples)
- 02
Metalworking incl. welding robots
- 03
Adhesive bonding in accordance with DIN EN 17460
- 04
Painting
- 05
Final assembly
- 06
Inspection with measuring arm (digital inspection reports)
Materials & Processes
Unalloyed steels
Base material group 1.2 according to CEN ISO/TR 15608 within the certified welding range (e.g. frame housings and flaps).
Austenitic Cr-Ni steels (stainless steel)
Corrosion-resistant material group 8 for filter and ventilation components in rail applications.
Aluminium and aluminium alloys
Material groups 22 and 23 for weight-optimized rail vehicle components, processable in the welding processes 131, 135, 141 and 21.
Locations
Weiden i. d. OPf.
DEDesign, sales, purchasing, accounting, HR
Roding
DEProduction: ventilation grilles, filters, doors, side wall and front flaps
- Materials
- Steel, stainless steel, aluminium
- Welding robots
- Measuring arm (digital inspection reports)
Components & Systems
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Production of air filter systems for rail vehiclesAssembly | – | – | – | – | – |
| Multi-cyclones / cyclone filtersAssembly | – | – | – | – | – |
| Snow filtersAssembly | – | – | – | – | – |
| Pressure protection systems for high-speed trainsAssembly | – | – | – | – | – |
| Manufacture of ventilation grillesAssembly | – | – | – | – | – |
| Manufacture of doors, side wall and front flapsAssembly | – | – | – | – | – |
| MetalworkingMachining | – | – | – | – | – |
| Welding (processes 131, 135, 141, 21 according to DIN EN ISO 4063)Joining | – | – | – | – | Base materials 1.2, 8, 22, 23 according to CEN ISO/TR 15608 |
| Adhesive bonding according to DIN EN 17460 (manufacturing methods SO, TK, HU; class A2)Joining | – | – | – | – | – |
| Final assemblyAssembly | – | – | – | – | – |
| Painting (paint specifications available)Surface | – | – | – | – | – |
| Design / Engineering (support from consulting through to 3D data and samples)Engineering | – | – | – | – | – |
2 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Welding robot | – | – | – | – | Roding |
| Measuring arm (digital inspection reports) | – | – | – | – | Roding |
Additional services
Reference customers
Quality & Certification
Quality assurance is carried out using digital inspection reports generated automatically with a measuring arm. The company is certified according to DIN ISO 9001:2015, DIN EN 15085-2 (welding of rail vehicles), DIN EN ISO 3834-2 and DIN EN 17460 (adhesive bonding for railway applications, class A2).
| Evidence | Roding |
|---|---|
| DIN ISO 9001:2015 | |
| DIN EN 15085-2 | |
| DIN EN ISO 3834-2 | |
| DIN EN 17460 |
History
- 1949
Company founded; original purpose: planning and execution of heating, cooling and ventilation technology
- 1993
Founding of Krapf & Lex Verkehrstechnik for the rail vehicle industry
- 2006
Company taken over by Silvia and Martin Schulz (succession from Mr. Lex)
- 2009
Introduction of multi-cyclones, among other things for desert regions
- 2010
Presentation of new products (cyclone filters, snow filters) at InnoTrans
- 2012
Expansion of the production facilities in Roding and new office building in Weiden
- 2015
Delivery reliability stabilizes at over 95 %
- 2017
Robert Schulz becomes new shareholder (company succession)
- 2019
Development of a product configurator (digitalization)
- 2021
New production hall for metalworking incl. welding robots
- 2023
Purchase of an additional plot of land with production hall and apartments for employees
- 2024
Relocation of final assembly to a new, modernized production hall
- 2025
Transition to fully ERP-driven digital production with automatic digital inspection reports (measuring arm)