I am experimenting with an air source heat pump, and need something better that a mechanical TEV since I'm operating over such a wide range. (heating water from 20°C up to 60°C
I have a new (old stock) Eglehoff valve.
egelhof. escap p5 32 258 012 20. swis made xj.06.92
3/8, 1/2" rtc .05 VE

But I have nothing to drive it. Apparently the pulse voltages are quite tricky. Anyone know where I might get some specification on this. My guess is that this level of data is usually kept secret by manufacturers.
If I draw a blank, I will look for a proprietary electronic valve to try. Any suggestions of what make to try? I am talking small. 1/2 tonne or so.
thanks