JA Neff 被引量: 0发表: 1985年 Four way, solenoid actuated, fluid operated valve four-way, solenoid actuated, fluid operated valve RM Cox,HF Gerwig,RV Hollingsworth,... - US 被引量: 29发表: 1954年 Electro-hydraulic proportional control servo valve A conventional control valve hydraulically pow...