Enabling valve having separate float and lift down positions
AssigneeClark Equipment Company
InventorsScott N. Schuh, Joseph A. St. Aubin, William B. Coykendall
Life of this patent
Estimating the term…
Abstract
Disclosed is a power conversion system for controlling the flow of a hydraulic power signal between a power source and a hydraulic actuator having first and second ports. The power conversion system includes a control valve that is configured to selectively expose each of the first and second ports to one of the power source and a low pressure reservoir. An enabling valve having a disabled position, a first enabled position, and a second enabled position receives an input from the control valve and provides an output to the hydraulic actuator.
Claims13
A power machine comprising:
- a frame;
- a work element operably coupled to the frame;
- a hydraulic actuator coupled to the work element and operable to move the work element relative to the frame;
- a power source capable of providing a hydraulic power signal as an output;
- and
- a power conversion system for controlling the flow of the hydraulic power signal between the power source and the hydraulic actuator, the power conversion system having a control valve and an enabling valve, the control valve being capable of determining a direction of flow between the power conversion system and the actuator and the enabling valve being movable between a first enabling valve position in which flow between the control valve and the actuator is blocked, a second enabling valve position that allows substantially unrestricted flow therethrough, and a third enabling valve position that allows a restricted flow therethrough.
A power conversion system for controlling the flow of a hydraulic power signal between a power source and a hydraulic actuator having first and second ports, comprising:
- a control valve configured to selectively expose each of the first and second ports to one of the power source and a low pressure reservoir;
- and
- an enabling valve having a disabled position, a first enabled position, and a second enabled position, the enabling valve receiving an input from the control valve and providing an output configured to be provided to the hydraulic actuator.
Dependencies are inferred from the claim text.