Hydraulic control circuit for implement

A hydraulic system for selectively providing pressurized hydraulic fluid flow to actuators on an implement configured to be hydraulically coupled to a power machine, the implement having a primary function actuator and at least one secondary function actuator, wherein the hydraulic system comprises:

• a hydraulic interface including first and second conduits coupleable to the power machine using first and second couplers, wherein each of the first and second conduits are configured to selectively receive pressurized hydraulic fluid from the power machine one at a time, and wherein the first conduit is coupled to an inlet port (A) of the primary function actuator to provide pressurized hydraulic fluid to the primary function actuator;
• a hydraulic flow control circuit configured to selectively control pressurized hydraulic fluid flow to and from the primary function actuator and to and from at least one secondary function actuator in first and second modes of operation, the hydraulic flow control circuit comprising:
• a first flow blocking device coupled between an outlet port (B) of the primary function actuator and the second conduit, the first flow blocking device allowing flow from the first conduit through the primary function actuator to exit the outlet port (B) and return to the second conduit, but the first flow blocking device blocking flow from the second conduit into the outlet port (B);
• a shuttle valve coupled between the first conduit and the second conduit, a center connection of the shuttle valve being coupled to an inlet to a circuit of the at least one secondary function actuator such that the center connection of the shuttle valve provides pressurized hydraulic fluid flow to the at least one secondary function actuator selectively and one at a time from the first conduit in the first mode of operation and from the second conduit in a second mode of operation;
• second and third flow blocking devices coupled together at a center node, the second flow blocking device coupled between the center node and the first conduit, and the third flow blocking device coupled between the center node and the second conduit, the second and third flow blocking devices configured such that return flow from the at least one secondary function actuator is directed selectively through the second conduit in the first mode of operation and through the first conduit in the second mode of operation;
• wherein in the first mode of operation the hydraulic flow control circuit is configured to receive pressurized hydraulic fluid flow from the first conduit and to provide the pressurized hydraulic fluid flow to the primary function actuator and to the at least one secondary function actuator, and wherein in the first mode of operation the hydraulic flow control circuit is configured to direct return flow of pressurized hydraulic fluid from the primary function actuator and from the at least one secondary function actuator through the second conduit for return to the power machine;
• wherein in the second mode of operation the hydraulic flow control circuit is configured to receive pressurized hydraulic fluid flow from the second conduit, to use the first flow blocking device to prevent flow of pressurized hydraulic fluid flow to the primary actuator, and to provide the pressurized hydraulic fluid flow to the at least one secondary function actuator, and wherein in the second mode of operation the hydraulic flow control circuit is configured to direct return flow of pressurized hydraulic fluid from the at least one secondary function actuator through the first conduit for return to the power machine.

A hydraulic system for selectively providing pressurized hydraulic fluid flow to actuators on an implement (configured to be hydraulically coupled to a power machine, the implement having a primary function actuator and at least one secondary function actuator, wherein the hydraulic system comprises:

• a hydraulic interface including first and second conduits coupleable to the power machine using first and second couplers, wherein each of the first and second conduits are configured to selectively receive pressurized hydraulic fluid from the power machine one at a time, and wherein the first conduit is coupled to an inlet port (A) of the primary function actuator to provide pressurized hydraulic fluid to the primary function actuator;
• a hydraulic flow control circuit configured to selectively control pressurized hydraulic fluid flow to and from the primary function actuator and to and from at least one secondary function actuator in first and second modes of operation, the hydraulic flow control circuit comprising:
• a first flow blocking device coupled between an outlet port (B) of the primary function actuator and the second conduit, the first flow blocking device allowing flow from the first conduit through the primary function actuator to exit the outlet port (B) and return to the second conduit, but the first flow blocking device blocking flow from the second conduit into the outlet port (B);
• a valve configuration comprising second and third flow blocking devices coupled between the first conduit and the second conduit, a center connection of the second and third flow blocking devices being coupled to an inlet to a circuit of the at least one secondary function actuator such that the center connection of the second and third flow blocking devices provides pressurized hydraulic fluid flow to the at least one secondary function actuator selectively and one at a time from the first conduit in the first mode of operation and from the second conduit in a second mode of operation;
• fourth and fifth flow blocking devices coupled together at a center node, the fourth flow blocking device coupled between the center node and the first conduit, and the fifth flow blocking device coupled between the center node and the second conduit, the fourth and fifth flow blocking devices configured such that return flow from the at least one secondary function actuator is directed selectively through the second conduit in the first mode of operation and through the first conduit in the second mode of operation;
• wherein in the first mode of operation the hydraulic flow control circuit is configured to receive pressurized hydraulic fluid flow from the first conduit and to provide the pressurized hydraulic fluid flow to the primary function actuator and to the at least one secondary function actuator, and wherein in the first mode of operation the hydraulic flow control circuit is configured to direct return flow of pressurized hydraulic fluid from the primary function actuator and from the at least one secondary function actuator through the second conduit for return to the power machine;
• wherein in the second mode of operation the hydraulic flow control circuit is configured to receive pressurized hydraulic fluid flow from the second conduit, to use the first flow blocking device to prevent flow of pressurized hydraulic fluid flow to the primary actuator, and to provide the pressurized hydraulic fluid flow to the at least one secondary function actuator, and wherein in the second mode of operation the hydraulic flow control circuit is configured to direct return flow of pressurized hydraulic fluid from the at least one secondary function actuator through the first conduit for return to the power machine.