Redundant Electrohydraulic Valve Parallel Actuation

The hydraulic system is segmented into separate controllable zones by introducing switching valves that can isolate individual valve devices. This allows the failed valve to be hydraulically separated from the system, preventing it from causing short-circuits while the second valve continues to operate. The switching valves create independent hydraulic pathways that can be selectively opened or closed based on valve status.

Switching valves act as intermediary elements between the parallel electrohydraulic valves and the hydraulic circuit. These intermediaries control the hydraulic connections, allowing the system to maintain redundancy while preventing harmful interactions between failed and operational valves. The switching valves mediate the hydraulic flow to ensure that a failed valve cannot create short-circuits through the working channel.

The electrohydraulic valve devices perform self-diagnostics to detect their own failure states and automatically activate the switching valves to isolate themselves from the hydraulic circuit. This self-service capability eliminates the need for external monitoring systems and complex control logic, as each valve independently manages its own failure mode and triggers the appropriate protective action.

The system incorporates feedback mechanisms where the state of each valve device is continuously monitored and used to control the switching valves. When a valve detects failure or reaches a failure state, this feedback signal automatically actuates the switching valve to isolate the failed component. This closed-loop feedback system simplifies control by using the valve's own state information to trigger protective isolation.

Each electrohydraulic valve device is equipped with self-diagnostics capabilities that allow it to independently detect failures and activate the switching valves for isolation. This eliminates the need for a separate higher-ranking control system, as each valve serves itself by monitoring its own operational state and autonomously initiating protective measures when failure is detected.

The error detection and isolation control functions are extracted from a centralized control system and embedded directly into each individual valve device. This distribution of control functions eliminates the need for complex higher-ranking control logic while maintaining safety, as each valve independently manages its own failure detection and isolation without requiring external intervention.