One of the spare part questions asked most often on site is whether this filter element will fit that machine. The answer cannot be judged from the appearance, and it cannot be concluded just because both of them are filter elements. What actually decides whether the two are interchangeable is that four conditions are met at the same time: the filtration accuracy code is the same, the shape and the interface dimensions are the same, the sealing arrangement and the mounting method are the same, and the material is compatible with the oil and the temperature conditions. If any one of the four does not match, the element cannot be used.
Start with the level that is inherently interchangeable. ZYD-100, ZYD-200 and ZYD-300 belong to the same series and share the same structural dimensions, so the usual element specifications can be exchanged within the series: coarse elements 150-250-50 and 110-250-50, the second stage element 110-400-20, and the fine elements 110-600-5 and 150-500-5. Of these, 150-500-5 is the standard configuration of the ZYD-100, and the standard configuration is 5 elements in parallel. When the model is changed within the same series, these elements can normally be transferred across directly.
Across categories, the accuracy and the operating conditions decide
The accuracy ranges of the different categories of machine are different in the first place: the ZYD series is ≤1 μm, the TYA series is ≤1 ~ 5 μm, TL-50 and TL-100 are ≤3 ~ 10 μm, the LX series is ≤5 μm, the LY series is ≤5 ~ 20 μm, and the JL series is ≤10 ~ 25 μm. Different accuracy ranges mean a different filter media structure and a different surface treatment; the media are not the same type in the first place, and one cannot take the place of the other simply because the interfaces look similar.
There is one special case: the automatic backwash structure. The filters of the TYA series come with automatic backwashing, which cleans the retained contaminants automatically while the machine runs. The structure of their filtration unit is not the same as that of an ordinary filtration unit, and the media are configured to the requirements of backwashing. If an ordinary element is put in its place, the backwash step no longer holds, and the element will be saturated within a very short time.
| Model | Filtration accuracy | Consumable characteristics |
|---|---|---|
| ZYD-100 / 200 / 300 | ≤1 μm | Fine element 150-500-5, the standard configuration of the ZYD-100 is 5 elements in parallel |
| TYA-50 / TYA-100 | ≤1 ~ 5 μm | With automatic backwashing, the media are configured to the backwash requirements |
| TL-50 / TL-100 | ≤3 ~ 10 μm | The adsorption unit is withdrawn and replaced as a whole |
| LX-100 / LX-200 | ≤5 μm | Centrifugal separation as the main principle, no filter element consumables involved |
| LY-50 / LY-200 | ≤5 ~ 20 μm | Mainly filter cloth and filter paper, supplied to match the frame size |
| JL-50 | ≤10 ~ 25 μm | Light mobile cart, consumables supplied to match the cart size |
How the consumables relate to the machine: which ones are configured per unit
Not every consumable has to be configured separately for each machine. General parts such as seals, O-rings and terminal blocks can mostly be bought for one model or another across the range, and when replacing them it is enough to check the dimensions and the material. What is genuinely configured to the machine is the filtration unit itself: the element length, the flange size of the interface, and the media type and mounting method. These three have to match the machine, and if they are wrong the replacement achieves nothing.
Another category of consumable that is often overlooked is the sealing. An aged seal may not be suitable even if its dimensions match, once it is used in a place with higher pressure and temperature. Where the sealing arrangement changes from an O-ring to a flange seal, the matching clamping parts have to be replaced together with it. Listing the seals by machine model in the spare parts list is more useful than listing the elements alone.
How to judge it on site and how to buy it
- Look at the last three digits of the code first. In 150-500-5 the first part gives the shape and the interface, while the last part relates to the filtration capacity and the filtration area; if the accuracy does not match, the element cannot be used.
- Then measure the interface and the length. The sealing face of a flanged interface and that of a cartridge interface are not the same, and a length that is out by a section leaves the end cap unable to press down properly, so a fitted element is in effect not sealed at all.
- Then check the sealing arrangement. If the seal has aged or the arrangement does not match, a bypass that does not pass through the element appears during operation: the differential pressure looks normal while the cleanliness does not improve.
- Buy the spare parts as a set for each machine model. Fit the coarse, second stage and fine elements of one model in one order, so that nothing has to be sourced at short notice when an element has to be changed.
- After a substitution, the condition must be verified again. The differential pressure, the sealing and the final cleanliness all have to be confirmed once more; a successful fit is not in itself proof that the element will work.
Interchangeability comes down to whether the four conditions of accuracy, interface, sealing and material hold at the same time; a similar appearance is only the result of those four being met.
