Importance

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Abstract

A hydraulic valve system for controlling and synchronizing the flow of hydraulic fluid to a set of first and second hydraulic actuators powered by a single control valve work section. The system includes a primary control valve or valves and a synchronizing control valve. The primary control valve is actuated to control the flow of hydraulic fluid between a source of pressurized hydraulic fluid and both the first and second cylinders, and includes an input port connected to the source of pressurized hydraulic fluid and an output port connected in a parallel hydraulic circuit to both the first and second cylinders. The synchronizing control valve is actuated to synchronize the flow of hydraulic fluid from the primary control valve to the first and second hydraulic cylinders by bleeding a portion of the flow of hydraulic fluid supplied to one of the cylinders to the tank. The synchronizing control valve has first and second input ports and an output port. The first synchronizing valve input port is connected to the first hydraulic cylinder. The second synchronizing valve input port is connected to the second hydraulic cylinder. The output port of the synchronizing valve is connected to the tank. Using the synchronizing valve an operator can easily and effectively synchronize the relative travel speed of the two cylinders.

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First Claim