Steam Engine Design/Solenoid
Steam Engine Design/Valves
Using Solenoid Valves for Steam Engine in Place of Mechanical Valving
Electronic Solenoid Valve Info: http://www.gwlisk.com/design-guide.aspx
Electrohydraulic valves are commercially available for internal combustion engines. Sturman is one maker.marine engines since 2003, however note these engines only run 80-90rpm.
Some design information on the Lotus/Eaton valve development for automotive engines here.
"Camless" automotive engines have been researched for decades and many prototypes of different electronically-controlled-timing valve lifters have been built; none have made it to a production car. A steam engine typically runs at lower rpm than a gasoline IC and is therefore much less demanding on this technology.
Fickett patented a uniflow steam engine with hydraulically actuated poppet inlet valve in 1938; not sure how successful it was in production.
Solenoid Valve design - is included in this book:
It would be good to design a strong solenoid for a hydraulic valve.