System for charging and discharging at least one hydraulic accumulator

A system for charging and discharging a hydraulic accumulator, the system comprises:

• a valve control device including an accumulator tap being connectable to the hydraulic accumulator in fluid communication and including a logic valve, a first shuttle valve and a switching valve, the logic valve, the first shuttle valve and the switching valve being interconnected in fluid communication with one another such that the switching valve receives and compares accumulator pressure from the accumulator tap to a minimum accumulator pressure, the switching valve being hydraulically operated and having an adjustable control setting the minimum accumulator pressure;
• the switching valve being in a minimum pressure valve position by the adjustable control and a control pressure from the accumulator tap conveying accumulator pressure at the accumulator tap to a piston end of the logic valve acting as a non-return valve when the accumulator pressure at the accumulator tap is lower the minimum accumulator pressure to prevent the accumulator pressure from being discharged below the minimum accumulator pressure.

A system for charging and discharging a hydraulic accumulator, the system comprises:

• a valve control device including an accumulator tap being connectable to the hydraulic accumulator in fluid communication and including a logic valve, a first shuttle valve and a switching valve, the logic valve, the first shuttle valve and the switching valve being interconnected in fluid communication with one another such that the switching valve receives and compares accumulator pressure from the accumulator tap to a minimum accumulator pressure, the switching valve being hydraulically operated and having an adjustable control setting the minimum accumulator pressure;
• and
• the logic valve, the first shuttle valve, the switching valve and a discharge valve being interconnected such that when accumulator pressure at the accumulator tap is higher than the minimum accumulator pressure, the switching valve moves to an actuated switching position and permits the first shuttle valve to convey a lower one of the accumulator pressures and a system pressure at a hydraulic system port to the piston end of the logic valve permitting fluid flow through the logic valve between the accumulator tap to the hydraulic system port and allowing the accumulator pressure to be charged and discharged.

A system for charging and discharging a hydraulic accumulator, the system comprises:

• a valve control device including an accumulator tap being connectable to the hydraulic accumulator in fluid communication and including a logic valve, a first shuttle valve and a switching valve, the logic valve, the first shuttle valve and the switching valve being interconnected in fluid communication with one another such that the switching valve receives and compares accumulator pressure from the accumulator tap to a minimum accumulator pressure, the switching valve being hydraulically operated and having an adjustable control setting the minimum accumulator pressure;
• and
• a solenoid shut-off valve being connected between the logic valve and the switching valve conveying the higher of an accumulator pressure at the accumulator tap and a system pressure at a hydraulic system port to the piston end of the logic valve moving a piston of the logic valve to a closed position thereof shutting off the accumulator tap from the hydraulic system port and inactivating a hydraulic-mechanical accumulator control, when the solenoid shut-off valve is unactivated or activated by a second shuttle valve.

A system for charging and discharging a hydraulic accumulator, the system comprises:

• a valve control device including an accumulator tap being connectable to the hydraulic accumulator in fluid communication and including a logic valve, a first shuttle valve and a switching valve, the logic valve, the shuttle valve and the switching valve being interconnected in fluid communication with one another such that the switching valve receives and compares accumulator pressure from the accumulator tap to a minimum accumulator pressure, the switching valve being hydraulically operated and having an adjustable control setting the minimum accumulator pressure;
• and
• the logic valve including a stepped piston having a first side opposite the piston end controlling a fluid connection between the accumulator tap and a hydraulic system port connectable to a hydraulic system.