Open-Center Hydraulic Valve Layout for Independent Flow Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional open center hydraulic systems face issues such as mutual dependency of valve assembly functionality, excessive use of hydraulic hoses due to centralized valve configuration, and increased complexity and cost from line rupture protection mechanisms, as well as unnecessary fluid flow to dual action actuators even when gravity can move them.
Innovation Solution
An open center hydraulic system with a hydraulic valve control unit that dynamically adjusts the opening areas of shunt and actuator valves based on user input and predetermined relations, allowing for separate placement of shunt and actuator valves, reducing hose length, and integrating valves to eliminate the need for line rupture protection valves, and enabling operation as single or double action actuators to conserve fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If valve assembly functionality is implemented in the same valve spool, then the system structure is simplified, but the functionality becomes mutually dependent and inflexible
Solution Approach 1:
The valve assembly is segmented into separate functional components: a shunt valve for controlling pump flow and actuator valves for controlling individual actuators. Each valve has independent control, allowing the shunt valve to manage overall system flow while actuator valves independently control specific actuators, eliminating mutual dependency.
Solution Approach 2:
The system transitions from fixed opening areas to dynamically adjustable opening areas. The shunt valve and actuator valves can independently adjust their opening areas based on real-time operational requirements, enabling flexible adaptation of hydraulic flow distribution without physical reconfiguration.
2Ease of operation
If all valves are centralized at one point, then control is consolidated, but excessive hydraulic hoses are required connecting actuators to the valve
Solution Approach 1:
The valve system is distributed into multiple independent valves placed at different locations: a shunt valve positioned to control pump output and actuator valves positioned near individual actuators. This segmentation reduces the need for long hydraulic hoses while maintaining consolidated control functionality.
Solution Approach 2:
The shunt valve acts as an intermediary that distributes hydraulic flow to multiple actuator valves. This intermediary structure allows consolidated control logic while enabling physically distributed valve placement, reducing hose length between the central control point and actuators.
3Reliability
If line rupture protection valves are added, then safety is improved, but system complexity and cost increase
Solution Approach 1:
The actuator valves incorporate inherent safety features that automatically prevent uncontrolled actuator movement in case of line rupture or hose break. The valve design includes internal mechanisms that self-regulate flow and pressure, eliminating the need for separate protection valves and reducing overall system complexity.
Solution Approach 2:
The safety protection functionality is merged into the actuator valves themselves rather than being implemented as separate components. The actuator valves combine flow control and safety protection in a single integrated component, reducing the total number of valves and simplifying the hydraulic system.
4Reliability
If flow is always provided to dual action actuators, then actuator operation is ensured, but unnecessary fluid flow occurs when gravity is sufficient
Solution Approach 1:
The actuator valves dynamically adjust their opening areas based on real-time conditions. When gravity is sufficient to move the actuator, the valve reduces or closes the opening to minimize or stop hydraulic flow, thereby reducing energy loss while ensuring actuator operation when needed.
Solution Approach 2:
The system changes the flow parameter dynamically by adjusting valve opening areas. The actuator valves modulate the hydraulic flow rate and pressure according to actual operational requirements, reducing flow when gravity assists movement and increasing flow when additional force is needed.
Data Source
AI summary
An open center hydraulic system (100) includes a tank configured to hold hydraulic fluid, a pump configured to provide pressurized hydraulic fluid from the tank, and a shunt valve configured to adapt a first opening area between a first input port and a first output port of the shunt valve dependent on a first control signal. The first input port is coupled to the pump, and the first output port is coupled to the tank. A first actuator valve is coupled to the first input port and configured to adapt a second opening area of the first actuator valve dependent on a second control signal. A hydraulic valve control unit is configured to determine a first opening area value and a second opening area value based on user input data and a predetermined relation dependent on the user input data, sending the first control signal, indicative of the first opening area value and sending the second control signal indicative of the second opening area value.