Magnetically Actuated Pipe Valve With Torque Clutch and Stem Indication
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Solution Overview
Problem
Existing magnetically actuated valve systems face challenges in providing sufficient torque for high-pressure applications and ensuring precise position indication without visual inspection, leading to potential leakage and mechanical stress issues.
Innovation Solution
A magnetically actuated valve mechanism utilizing a torque-limiting first-order magnetic coupling with alternating polarities in internal and external magnetic arrays, combined with a position indication system that detects the configuration of a ferromagnetic strip to determine the valve's position, preventing slippage and overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a strong magnetic connection is used to provide sufficient torque for high-pressure applications, then the torque capability is improved, but the risk of over-torque and valve breakage increases
Solution Approach 1:
The patent implements a torque-limiting clutch mechanism that预先 (in advance) limits the maximum torque transmitted to the valve stem. The clutch is designed to slip or disengage when a predetermined torque threshold is reached, preventing over-torque conditions before they can cause valve breakage. This resolves the contradiction by providing sufficient torque for normal high-pressure operation while protecting against excessive torque that would damage the valve.
2Reliability
If a magnetic coupling system is used to actuate the valve, then the leakage is prevented, but the position indication becomes difficult without visual inspection
Solution Approach 1:
The patent introduces a ferromagnetic strip as an intermediary element that couples the internal valve mechanism to the external position indicator. The strip is magnetically coupled to the valve stem internally, while its external portion can be detected by a position sensor without breaking the seal. This mediator allows non-contact position detection through the valve housing, resolving the contradiction between maintaining leakage prevention and enabling position indication.
3Strength
If a torque-limiting clutch mechanism is implemented, then the valve breakage is prevented, but the position indication accuracy may be affected due to potential slippage
Solution Approach 1:
The patent segments the magnetic coupling system into distinct zones: a locked zone where the magnetic coupling maintains precise position transmission during normal operation, and a slip zone where the torque-limiting clutch allows controlled slippage to prevent over-torque. The ferromagnetic strip is positioned and dimensioned to remain in the locked zone under normal conditions, ensuring position indication accuracy is maintained while the clutch provides protection against excessive torque.
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 solution provides a zero-fugitive emissions valve that maintains a strong magnetic connection even under high pressure, prevents valve breakage due to over-torque, and allows for remote position determination without visual inspection, enhancing the reliability and efficiency of valve operation.
Implementation Method 1
actuation of the outer magnetic array applies torque to the inner magnetic array, thereby causing the actuator stem to rotate
Implementation Method 2
a position indicator attached to an outside surface of the valve housing configured to detect a configuration of the valve based on detecting a position of the ferromagnetic strip
Data Source
AI summary
A valve includes a magnetic actuation mechanism providing torque-limiting capabilities and valve stem position indication. A drive shaft of the valve is surrounded by a first annular magnetic array within a fully sealed pressure vessel. A second annular magnetic array is positioned outside of the pressure vessel and surrounds the fully sealed pressure vessel. Each of the first annular magnetic array and the second annular magnetic array include magnets having alternating polarity, allowing the first annular magnetic array and the second annular magnetic array to form a first order coupling mechanism. When the second, outside annular magnetic array is rotated, the first annular magnetic array is caused to move, actuating the valve. Importantly, the valve includes a position indication system able to determine a position of the valve stem and includes an automatic feedback mechanism for comparing an actual position of the valve with an expected position of the valve.