Control valve assembly

摘要

A power machine and a power conversion system for a power machine are disclosed. In an exemplary embodiment, the power conversion system includes a pump configured to provide a source of pressurized hydraulic fluid and a control valve assembly to receive the hydraulic fluid. The control valve assembly includes a first valve element configured to direct hydraulic fluid to an actuator when the first valve element is in first and second actuated positions. The control valve assembly also includes a second valve element downstream of the first spool. The first valve element is moveable between an unactuated position and the first and second actuated positions and is configured to direct hydraulic fluid received from the actuator through the second actuated position to the second valve element and to direct hydraulic fluid received from the actuator through the first actuated position to bypass the second valve element.

主权项

1. A power conversion system for a power machine, comprising:
a pump configured to provide a source of pressurized hydraulic fluid; a control valve assembly coupled to the pump to receive the pressurized hydraulic fluid from the pump, the control valve assembly including:
a first valve element having an unactuated position and first and second actuated positions, the first valve element configured to direct pressurized hydraulic fluid to and receive pressurized hydraulic fluid from an actuator when the first valve element is in the first and second actuated positions; anda second valve element downstream of and in series with the first valve element when the first valve element is in the unactuated position, the second valve element having first and second actuated positions; and wherein the first valve element is moveable between the unactuated position and the first and second actuated positions, and wherein the control valve assembly is configured to direct hydraulic fluid received from the actuator through the second actuated position to the second valve element, and direct hydraulic fluid received from the actuator through the first actuated position to bypass the second valve element.