Fluid-Pressure Actuator Safety TRIZ Cases

Multipart tappets and dual main stages enable energy-free high-pressure switching while preventing temporary pressure surges and reducing valve complexity.

Pressure test sequences and one hydraulic sensor detect electrically operable valve faults without costly position sensors or complex processing.

Dual pilot-operated valves run in parallel with fail-safe pilot drainage to maintain actuator control and raise hydraulic flow capacity.

An avoidance slot and limiting portion let the shaft rotate freely during spool return, reducing hysteresis and directional asymmetry.

By aligning hydraulic reaction and support forces in one direction, this ram piston assembly improves burst disc sealing and fatigue life.

Magnetic attraction offsets valve closing force, removing the pilot stage to cut pneumatic pressure demand, air flow, and bulk.

A switchable control valve and 2-way flow control path cut flow while minimizing fluid loss and maintaining pressure stability at high inlet pressure.

Dual motor pumps fed by separate electrical sources share hydraulic load based on available power to prevent overloads and reduce pump wear.

Pressure sensors and oil temperature monitoring help detect valve faults, prevent unintended excavator rotation, and cut hydraulic energy waste.

Independent primary and secondary chambers plus a force-balance chamber maintain actuator function under damage while limiting weight and force imbalance.

A valve-controlled hydraulic circuit replaces friction braking on torque tubes to prevent stick-slip, avoid back-driving, and extend duty cycle.

A return line routed through chamber A keeps hydraulic pressure on the lock during line bursts, preventing unintended unlocking in flight.

A dual-stage seat valve closes relief paths before pressurization, enabling redundant high-pressure safety switching with lower noise and energy loss.

A spacer and lock nut make support and hydraulic forces act together on the burst disc, improving sealing and reducing leakage in hydraulic tools.

Pilot pressure selection and differential pressure control keep travel motors and hydraulic actuators smooth under changing engine load.

A low-fluid warning lets mowing continue until the cutting units are raised, then shuts hydraulic circuits to limit leaks and turf damage.

A spool valve opens a pilot relief path after a set stroke to limit hydraulic flow safely without abrupt pressure loss.

High-pressure cylinders, check valves, and a flow divider let one operator quickly squeeze lay flat or poly hose from a safer distance.

A nested-spool valve combines differential pressure sensing, relief, and bypass to isolate stuck flight-control actuators and reduce structural stress.

A nested-spool hydraulic valve combines sensing, relief, and bypass to isolate failed flight actuators and protect control surfaces.

A rotary selector valve replaces bulky plunger valves and rubber seals, enabling compact manual actuator override with leak-resistant metal sealing.

A transfer valve reroutes fluid flow between control valves and actuators, preserving aircraft actuator operation when a primary valve fails.

Using bogie air pressure and hydraulic cavities, this case enables real-time connecting rod length switching for safer, smoother curve passage.

A sleeve aperture and low-pressure cavity let the actuator hold the last commanded position and resist external loads during electrical failure.

A pressure-side gasket blocks leakage airflow in pneumatic actuator safety valves, preventing unintended activation while preserving release function.

A volumetric flow divider replaces heavy mechanical linkage to synchronize thrust reverser actuators with lower weight and simpler installation.

Movable locking sleeves cover valve air couplings to block accidental compressed-air supply and prevent unintended switching during maintenance.

Distributed sensors, relief valves, and throttle valves detect and quantify gas network leaks and obstructions without exact topology knowledge.

Piston motion is compared with reference profiles to flag internal hydraulic cylinder leakage before refuse truck downtime occurs.

An integrated piston safety valve relieves excess hydraulic chamber pressure while stabilizing lift arm operation and simplifying valve structure.

A volumetric flow divider synchronizes thrust reverser actuators without heavy mechanical linkages or centralized hydraulic circuits.

Segmented inner and outer poppet lands create fluid-tight seals that trap contamination, reducing sticking, silt lock, and maintenance.

A controlled leakage path reveals pressure decay patterns, helping verify hydraulic supply health before startup or backup switching.

A spool opens a pilot pressure relief path after a set stroke, limiting hydraulic flow and preventing pressure buildup with a simple safety function.

LS pressure feedback verifies demolition robot arms stay still in safe mode, enabling ISO-aligned protection without extra sensors.

A separated hydraulic actuator layout cuts weight for ROV replacement in deepwater valves while preserving fail-safe force reduction.

Compressed-air cylinders lift both stilts together to avoid repeated manual adjustment, reduce torque imbalance, and improve user safety.

A pilot signal selectively disables the backflow prevention circuit so a working machine blade can move freely in float mode without losing stability.

Piston motion is compared with reference behavior to flag internal hydraulic cylinder leakage before refuse truck downtime occurs.

An integrated pressure signal lets a sensor verify steering isolation valve state at startup without wheel movement, improving fault coverage.

Periodic valve dithering reduces static friction in pilot and main hydraulic valves, improving implement response and control precision.

A pressure relief valve in the forklift lift circuit limits fault-induced mast pressure spikes, enabling higher lowering speeds without mast reinforcement.

Pressure changes in a spool valve control volume reveal jamming in real time, reducing manual inspections and supporting actuator operation.

Pressure monitoring in a control volume detects directional spool valve jamming in real time, reducing manual inspections and improving actuator safety.

A dual pilot oil path with pressure selection and adjustment valves helps maintain travel pump efficiency while managing engine load.

A single transfer valve isolates a failed electrohydraulic servo valve so the actuator keeps moving with the remaining valve while reducing weight and leakage.

A regeneration valve and unloader path balance energy recovery with quicker rod-end fluid supply, improving hydraulic cylinder operability.

Redundant counterbalance valves isolate particle-related valve closing faults to prevent uncontrolled hydraulic load descent and hold position reliably.

Two parallel EHSVs with transfer and solenoid valves cut weight and leakage while preserving actuator control after valve failure.

A bursting device built into the separating element relieves overpressure inside the accumulator while containing gas and fragments.