Control valve and system with primary and auxiliary function control
AssigneeParker-Hannifin Corporation
InventorsJoshua Matthew Guarino, Brian Bernard Slattery
Life of this patent
Estimating the term…
Abstract
A method of controlling a hydraulic system having a hydraulic lift function and an auxiliary function includes disabling the hydraulic lift function and the auxiliary function by routing pump flow to tank and opening the lift function and auxiliary function to tank with a single valve; enabling the lift function by closing pump flow to the auxiliary function and routing pump flow to the lift function with the single valve; and enabling the auxiliary function by closing pump flow to the lift function and routing pump flow to the auxiliary function with the single valve.
Claims14
A sectional fluid control valve system comprising:
- a combined inlet and auxiliary work section upstream of the primary work section;
- the combined work section including a pump inlet, an auxiliary work port, a pump pressure passage, and a valve member intermediate the pump inlet and the auxiliary work port and intermediate the pump inlet and the pump pressure passage;
- the valve member having a disable position substantially disabling fluid pressure communication from the pump inlet to the auxiliary work port and from the pump inlet to the combined section pump pressure passage;
- the valve member having a primary enable position closing fluid pressure communication between the pump inlet and the auxiliary work port and opening fluid pressure communication between the pump inlet and the combined section pump pressure passage;
- and
- the valve member having an auxiliary enable position closing fluid pressure communication between the pump inlet and the combined section pump pressure passage and opening fluid pressure communication between the pump inlet and the auxiliary work port.
A method of controlling a hydraulic system having a hydraulic lift function and an auxiliary function, the method comprising:
- disabling the hydraulic lift function and the auxiliary function by routing pump flow to tank and opening the lift function and auxiliary function to tank with a single valve;
- enabling the lift function by closing pump flow to the auxiliary function and routing pump flow to the lift function with the single valve;
- and
- enabling the auxiliary function by closing pump flow to the lift function and routing pump flow to the auxiliary function with the single valve.
Dependencies are inferred from the claim text.