Praxair powder feeder 1264 malfunction

[JeroenB]

Dear Thermal Spray experts,

We have two identical Praxair powder feeders model 1264. Both are well-maintained and are running fine for years and years. 

Last week we noticed a reduced buildup on one of our HVOF installations. We changed powder feeders and the problem was solved.

We compared both powder feeders on one product and the buildup was only have with the "problematic" powder feeder. The powder consumption was also half so it is a feed problem. 

We have disassembled the powder feeder already twice and checked all items below:
1. We changed the slotted disc for a new one
2. We checked that all nitrogen & powder channels are free
3. We checked the RPM settings of the machine with the actual revolutions
4. We changed all wear parts with new ones

The problem still remains... Could you please share problems that you have had with your powder feeder installations so that I could find some inspiration as to where the problem might occur?

Thank you,

Jeroen Belis