Control Valve for a Hydraulic System

A valve assembly, comprising:

• a first ejector port and a second ejector port to be coupled to a corresponding first end and second end of a first cylinder;
• a first closure port and a second closure port to be coupled to a corresponding first end and a second end of a second cylinder;
• a third port to be coupled to one of a hydraulic pump or a lower pressure tank depending on a position of an implement valve to be coupled, the third port hydraulically coupled to the first ejector port and the second closure port;
• a fourth port to be coupled to the other of the hydraulic pump or the lower pressure tank;
• a selector valve being movable between a first position and a second position, in the first position, the selector valve is hydraulically coupled between the second ejector port and the third port and the first ejector port, and in the second position, the selector valve is hydraulically coupled between the second ejector port and the fourth port;
• and
• a sequence valve hydraulically coupled between the selector valve, the third port and the first ejector port, wherein, when the selector valve is in the first position, the sequence valve is configured to open when pressure at the second ejector port reaches a predetermined pressure to allow hydraulic fluid to move between the second ejector port and the first ejector port, when the selector valve is in its second position.

A truck, comprising:

• a bed;
• an ejector plate coupled to the bed, the ejector plate being movable between a retracted position, such that the bed is able to receive load material, and an extended position, such that the load material is at least partially removed from the bed;
• a rear gate coupled to the bed, the rear gate being movable between a closed position thereby retaining the load material in the bed, and an open position thereby allowing at least a portion of the load material to be removed from the bed;
• a first cylinder operably connected to the ejector plate, the first cylinder having a second end and a first end, and being movable between a retracted position and an extended position, the first cylinder configured to move the ejector plate between the retracted and extended positions;
• a second cylinder operably connected to the rear gate and hydraulically connected to the first cylinder, the second cylinder having a second end and a first end, and being movable between a retracted position and an extended position, the second cylinder configured to move the rear gate between the closed and open positions;
• a hydraulic pump coupled to the first and second cylinders;
• a selector valve hydraulically connected to the second end of the first cylinder, being movable between a first configuration and a second configuration;
• and
• a sequence valve hydraulically connected between the selector valve and the first end of the first cylinder, wherein, in response to the hydraulic pump providing initial flow to the first end of the first cylinder to move the first cylinder to the extended position, the selector valve is in the first configuration to hydraulically couple the second end of the first cylinder to the sequence valve, and the sequence valve is configured to open when pressure from the second end of the first cylinder reaches a predetermined pressure, to permit fluid to flow from the second end of the first cylinder to the first end of the first cylinder.