I've got a couple 4 way solenoid valves made by STC (imported by STC) that don't seem to work. 12VDC Model 4V310-1/4. They are NIB, but I bought them quite a long time ago for the project I am currently working on. I don't even recall who I bought them from, but they were not super cheap nor excessively expensive. Around $40 if I recall.
I've used plenty of simple on-off solenoid valves in the past. They just work. You hit them with the rated voltage and adequate current and they reverse condition. Open/closed
When I hit these STC valves with 12VDC from a 12V battery (plenty of current from a battery) they click and a red light turns on, but the shuttle that changes the port connections of the valve doesn't move.
I'm looking at the installation instructions from STC right now on their website, and I don't see anything that doesn't make sense. Is there a setting or setup I am missing or do these valves just not work?