Abstract: The invention provides a steering system e.g. for a vehicle. The system comprises a system-pump, a steering actuator, a rotary valve, a rotary meter, and a motor. The system-pump is arranged to provide a flow of a fluid to the steering actuator via the rotary valve and via the rotary meter, and the motor is arranged to provide rotation of the rotary valve and the rotary meter. To handle an emergency situation if the system-pump fails, the motor is dimensioned to operate the rotary meter as a fail-operational pump for pumping a flow of the fluid to the steering actuator if the system-pump fails.

Abstract: A system for inserting control lines to a control line receptacle at an alternate path structure includes an upper guide having a path structure engagement roller, a control line insertion wheel and a control line bypass space and further includes a lower guide separate from the upper guide and having a path structure engagement roller and a control line insertion wheel, the path structure engagement roller and control line insertion wheel being resiliently biased to a position calculated to cause control line insertion to the alternate flow path structure when in an engaged position.

Abstract: A ball design for withstanding high differential pressures without leakage features a circumferential groove near the circle of contact on the ball with a surrounding seat. High differential forces are transmitted beyond the circle of contact so that deflection due to applied differential pressures results in flexing in the groove area while maintaining full circumferential seat contact to prevent leakage.

Abstract: A hole digging device is configured as an attachment for use in combination with a hydraulic excavator, such as a backhoe, the device including opposed, pivotally connected digging blades. One of the blades includes opposed arms for supporting the device on the distal end of the boom of the hydraulic excavator or backhoe and the other digging blade also includes opposed arms for connection to the piston rod of a hydraulic cylinder for moving the digging blades relative to each other between open and closed positions.