If I remember right on my spot free system I had a burkert valve problem similar to yours and I called my maintenance parts supplier and they didn't have the exact valve so they sent me an asco. I looked a little further into it and I think they listed my burkert valve as a two way valve so I ended up ordering a rebuild kit direct from burkert for my existing valve and a new valve new in case the rebuild wasn't successful. Rebuild worked so now I have a spare. Hope this helps.