Valve and pump control for a hydraulic system
AssigneeDouglas Dynamics, L.L.C.
InventorGeorge D. Simonds, Jr.
Life of this patent
Estimating the term…
Abstract
The operation of a 4-way, open-center, three position hydraulic valve is coordinated with the operation of the pump for the hydraulic system in which the valve is controlling flow. As the valve is moving from its open-center position to either one of its other two operative positions, a switch maintains the power circuit for the pump open and closes that circuit to activate the pump after the valve has assumed one of the other two positions.
Claims11
A combination valve, valve actuator and pump control for use in a hydraulic system wherein said valve is manipulated by said valve actuator to control flow in said hydraulic system and a pump is controlled by said pump control to produce flow in said hydraulic system and wherein
- said valve includes
- a body,
- a valve member in said body movable between first, second and third positions,
- means defining a plurality of flow ports in said body operatively associated with said valve member so that as said valve member assumes said first, second and third positions fluid flow circuits are established through said valve, and
- shaft means connected to said valve member for transmitting movement to said valve means, said shaft means projecting exteriorly of said body;
- said valve actuator including operating means engaging said shaft means and having first, second and third states of operation corresponding to said first, second and third valve member positions;
- said pump control includes switch means in the circuit for said pump means to alternately activate and deactivate said pump means circuit;
- and means connecting said operating means directly to said shaft means and including switch actuating means assuming positions relative to said switch means in accordance with whether said operating means is in said first, second or third states of operation, in said first state of operation said switch means deactivating the circuit to said pump means and activating the circuit to said pump means when said operating means is in said second and third states of operation and after said valve member has moved to said second and third positions.
A combination valve, valve actuator and pump control for use in a hydraulic system wherein said valve is manipulated by said valve actuator to control flow in said hydraulic system and a pump is controlled by said pump control to produce flow in said hydraulic system and wherein
- said valve includes
- a body,
- means defining at least two flow ports in said body,
- a valve member movable in said valve body relative to said flow ports to selectively open and close said ports to fluid flow,
- and shaft means connected to said valve member for transmitting movement to said valve means, said shaft means projecting exteriorly of said body;
- said valve actuator including operating means for producing said valve member movement;
- said pump control switches means in the circuit for said pump means to alternately activate and deactivate said pump means circuit;
- and means connecting said operating means directly to said shaft means and including switch actuating means operatively associated with said switch means to maintain said switch means in a state whereby said pump means circuit is deactivated when said valve member is in one position relative to said ports and to establish a second state of said switch means activating said pump means circuit after said valve member has moved from said one position relative to said ports to a second position relative to said ports.
Dependencies are inferred from the claim text.