SPX Stone/Fenner part number VF-4010. It is a Deltrol, Pilot-Operated Solenoid Valve Cartridge. The Deltrol number that is stamped into the housing is DSV-080-2NCP-NM. This is a very common valve used in many hydraulic power unit applications where manual override protection is required.
Normally-Closed, Two-Way, Two-Position, Pilot-Operated Solenoid Valve
This cartridge valve is designed with positive shut off to be used in load holding applications and a manual override feature to relieve pressure in case of an emergency such as power failure.