Patent ID: 6964322

Claim:
A hydraulic fluid control system for a vehicle lift comprising: a. at least one source of hydraulic fluid; b. a first hydraulic actuator configured to move a first vertically moveable superstructure, said first hydraulic actuator being in fluid communication with said at least one source of hydraulic fluid; c. a second hydraulic actuator configured to move a second vertically moveable superstructure, said second hydraulic actuator being in fluid communication with said at least one source of hydraulic fluid; d. a first proportional flow control valve interposed between said at least one source of hydraulic fluid and said first hydraulic actuator; e. a second proportional flow control valve interposed between said at least one source of hydraulic fluid and said second hydraulic actuator; f. said first proportional flow control valve and said second proportional flow control valve each being independently controllable relative to each other; and g. a controller connected to said first and second proportional flow control valves for controlling flow of said hydraulic fluid to said first and second hydraulic actuators.