Hydraulic Isolation Valve Trigger With Incremental Spring Actuation
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Solution Overview
Problem
Existing isolation valve systems lack an efficient mechanism for actuating hydraulic valves, particularly in applications requiring precise control and incremental movement.
Innovation Solution
A hydraulic trigger system that includes a housing assembly, a core rod, a power spring, an inner axial cycling piston bar, and a piston with a cycling spring, which together enable incremental movement of the core rod and compression of the power spring, ultimately actuating a hydraulic valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional actuation mechanism is used for isolation valves, then the valve can be actuated, but the control precision and incremental movement capability are insufficient
Solution Approach 1:
The actuation mechanism is segmented into discrete incremental steps using a ratchet mechanism with multiple teeth. The core rod moves in discrete increments corresponding to each ratchet tooth engagement, enabling precise control of the valve actuation process rather than continuous movement.
Solution Approach 2:
The actuation system uses periodic cycling of hydraulic pressure to advance the piston and core rod in discrete steps. Each pressure cycle advances the mechanism by one incremental step, allowing controlled, periodic actuation that achieves precise positioning through repeated small movements.
2Manufacturing precision
If incremental movement control is implemented, then precise actuation is achieved, but the device complexity increases
Solution Approach 1:
The mechanism employs nested components where the inner axial cycling piston bar is positioned within the housing assembly, and the core rod with ratchet teeth is nested within the piston assembly. This nested arrangement achieves precise incremental movement through multiple interacting components while compacting the overall structure.
Solution Approach 2:
The ratchet teeth on the core rod act as an intermediary mechanism between the piston movement and the valve actuation. The ratchet mechanism converts continuous piston movement into discrete incremental steps, providing precise control while simplifying the connection between the actuating force and valve position.
3Force
If the power spring is highly compressed to increase actuation force, then the valve can be actuated against higher pressures, but the risk of premature shear screw failure increases
Solution Approach 1:
The power spring is pre-compressed to a controlled extent during assembly, establishing a predetermined initial force. The ratchet mechanism with multiple teeth provides staged engagement, allowing the spring force to be applied incrementally rather than all at once, which prevents sudden overload of the shear screws while still achieving sufficient actuation force.
Solution Approach 2:
The ratchet mechanism serves as a cushioning element that distributes the spring force across multiple engagement points. Instead of a single point of force application that could cause stress concentration and premature failure, the multi-tooth ratchet spreads the load, cushioning against peak stresses that would threaten shear screw reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures precise actuation of hydraulic valves by controlling incremental movements and compression forces, ultimately leading to reliable operation and efficient valve state changes.
Implementation Method 1
the piston is configured to move in an upward direction as the cycling spring exerts a downward force on the piston head of the piston upon application of a cycling force in the upward direction
Implementation Method 2
the core rod to move an incremental distance in the downward direction, which compresses the power spring by the incremental distance
Data Source
AI summary
A core rod has internal and external profiles disposed in a housing assembly. A power spring in cooperation with the core rod within the housing assembly is connected to a power spring stopper that is fixed to the housing assembly with at least one shear screw. An inner axial cycling piston bar includes an external profile for mating engagement with the internal profile of the core rod. The inner axial cycling piston bar is connected to a piston in cooperation with a cycling spring, and the piston is configured to move in an upward direction. When a downward force exerted by the cycling spring exceeds the upwardly applied cycling force, the piston, the inner axial cycling piston bar, and the external profile move in a downward direction, thereby causing the core rod to move an incremental distance in the downward direction, which compresses the power spring by the incremental distance.