Retrofit instead of buying a new one: If the filter body is still good, it is often enough to use it
In many systems, the filter housing is still in very good mechanical condition – only the filter insert / strainer insert is worn, deformed or can no longer be cleaned economically due to deposits. In precisely these cases, retrofitting is the clever solution: instead of procuring a complete new filter, a custom-fit replacement strainer insert is manufactured – quickly, economically and precisely tailored to the process.
The following expressly applies: Replacement strainers and strainer inserts are not only supplied for our own filters, but also for filters from other manufacturers – even after many years of operation.
For which filter types are replacement strainers / strainer inserts suitable?
Replacement and retrofit screen inserts are manufactured for the following systems, among others:
- Strainers (e.g. Y-strainer / angled seat)
- Simplex strainer (Simplex)
- Basket strainer
- as well as other variants/protective strainers according to application (e.g. conical strainers/flat plate strainers in the system start-up)
Typical process: How a custom-fit replacement strainer insert is made
To ensure that spare parts really do fit “plug & play”, the following procedure has proved successful:
- Send template: Old filter, sample screen, sketch/drawing or photos with dimensions.
- Design / adjustment: Geometry, installation heights, stops, sealing surfaces, fastening are checked and accepted.
- Design according to process: design, perforation and mesh size are defined to suit the medium and degree of contamination.
- Manufacture & delivery: The strainer insert is manufactured as a welded version and supplied as a spare part (also at short notice, depending on the version).
Technical options: Design, mesh size, gasket, accessories
1) Mesh size & filtration area
Depending on the application, mesh sizes from 50 µm to 10 mm are possible – for fine to coarse filtration.
2) Types & designs
- Welded design for high stability
- Pleated (folded) inserts to increase the filter surface area
- Compatibility depending on the system, e.g. type A with O-ring gasket or type B with clamping bracket
3) Materials (stainless steel & special materials)
As standard, strainer inserts are manufactured in stainless steel 1.4301 / 1.4571 / 1.4401, for example; special materials can also be realized depending on the medium.
4) Typical size/pressure ranges
- Ranges from DN 25 to DN 500 are common (others on request).
- Nominal pressures such as PN 10 to PN 40 are supported (depending on the project).
5) Retrofitting: solenoid & differential pressure
An extension is useful for many applications, e.g:
- Magnetic rods / magnetic cylinders for separating ferromagnetic particles (e.g. chips, magnetite).
- Differential pressure display for status monitoring (filter change/cleaning according to actual load instead of calendar).
- Depending on the system, modifications such as draining/venting are also possible.
Why retrofitting is often the better decision in practice
Retrofit means: The existing body remains in use, the wearing part is replaced. This typically results in
- Cost optimization because the entire system does not have to be procured from scratch.
- Faster re-availability, especially if original parts are no longer available (e.g. for old systems/third-party products).
- Process optimization because mesh size/perforation and design can be adapted to current media conditions.
Checklist for quick quotation preparation
The following information will help you get a quick quote:
- Filter type (e.g. strainers, simplex strainer, basket strainer)
- DN / installation dimensions / design (photo + tape measure is often sufficient)
- Medium, temperature, nominal pressure
- Desired mesh size / perforation
- Optional extras: e.g. magnetic rod/magnetic cylinder
Conclusion: Precisely fitting screen insert instead of completely new procurement
If the filter housing is still in good condition, a custom-made strainer insert is usually the quickest way back to stable filtration – even with other brands and even after many years.
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