145959 ⎘
Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action using separate dosing chambers of predetermined volume
Hydraulic metering system for downhole hydraulic actuation
#2Control valve and work vehicle having the control valve
#3Hydraulic drive and method for discreetly changing the positional output of said drive
#4VALVE AND HYDRAULIC CONTROLLER
#5VALVE AND HYDRAULIC CONTROLLER
#6Apparatus and method for positioning connection equipment on a drilling rig
#7Fluid metering device and method for well tool
#8Hydraulic control device
#9Linear hydraulic stepping actuator with fast close capabilities
#10Hydraulic circuit