Directional Control Valve Spool and Body Architectures for Third-Position Connectivity
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Solution Overview
Problem
Existing directional control valves with a third position typically require minor variations in spool geometry, limiting their ability to achieve fluid communication between two actuator ports while isolating inlet and exhaust ports effectively.
Innovation Solution
The introduction of 7, 8, and 9-port designs, which include additional internal ports and specific spool lobe configurations, allowing for fluid communication between two actuator ports and isolation of inlet and exhaust ports in the third position, maintaining compatibility with conventional 5-port designs through internal flow path modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional 5-port valve geometry is used with minor spool variations, then manufacturing simplicity is maintained, but the ability to achieve fluid communication between two actuator ports while isolating inlet and exhaust ports in the third position is limited
Solution Approach 1:
The valve body is segmented into multiple port regions (inlet, exhaust, actuator ports) with distinct functional zones. The spool is segmented into multiple lobes (typically three lobes) that independently control different port connections. This segmentation allows the third position to achieve unique fluid connectivity (connecting both actuator ports while isolating inlet and exhaust) without requiring complete redesign of the entire valve structure.
Solution Approach 2:
Different regions of the spool are given different geometric characteristics through the lobe configurations. The lobes have varying widths and positions tailored to control specific port connections at different spool positions. This local differentiation enables the third position to provide specialized fluid connectivity (actuator port-to-actuator port connection) while maintaining standard connectivity patterns in the first and second positions.
2Adaptability or versatility
If additional internal ports (7, 8, or 9 ports) are introduced to enable third-position fluid communication between actuator ports, then functionality is enhanced, but device complexity increases
Solution Approach 1:
The additional internal ports are designed to serve multiple functions across different spool positions. For example, in the 7-port configuration, the additional ports enable the third position to connect actuator ports while also maintaining proper isolation of inlet and exhaust ports. The same port structure supports all three positions (first, second, and third) with their respective connectivity requirements, reducing the need for entirely separate port systems for each function.
Solution Approach 2:
The patent presents nested design options where 7-port, 8-port, and 9-port configurations are progressively more comprehensive versions of each other. Each configuration builds upon the previous by adding internal ports that provide additional flow paths or isolation capabilities. This nested structure allows designers to select the minimum necessary complexity (7 ports) while having the option to add more ports (8 or 9) if additional functionality or redundancy is required.
Data Source
AI summary
A directional-control valve is typically comprised of a valve spool that slides linearly within a valve body. The valve body typically includes five internal ports, which are covered or exposed as the spool slides within the body. The typical five-internal-port architecture precludes certain combinations of port connectivity when the spool is in the center position. For example, when the spool is in the center position, providing connectivity between the actuator ports, while simultaneously providing fluid isolation of the supply and exhaust ports, is not directly achievable with a standard five-port architecture. This application describes three embodiments that enable the aforementioned port connectivity when the spool is in the center position.