This is an actual valve, available from Rexroth. How completely can you describe it?
When you're ready, scroll down to see our answer.
This is a 4 port, 3 (infinite) position, float center (P port blocked), variable solenoid controlled, pilot operated, spring centered, proportional directional control valve, with onboard electronics (amplifier).
And for our non-North American friends, rather than "float", the center may be described as "A and B connected to T, P port blocked."