Helical Valve Position Indicator for Clear Open-Close Visibility
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Solution Overview
Problem
The position of certain valves is not immediately recognizable by visual inspection due to their configuration or distance from personnel, making it difficult to determine whether the valve is open or closed.
Innovation Solution
A valve position indicator system that includes a spline barrel with a helical slot and an indicator flag, which rotates and moves between positions to visually indicate the valve's status, allowing for easy identification of the valve's open, closed, or intermediate position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the valve is positioned at a distance or configured in a way that is not easily visible, then the valve can be installed in various locations for fluid control, but the valve position becomes difficult to recognize visually
Solution Approach 1:
The patent introduces an indicator flag as an intermediary element that visually represents the valve position. The flag is coupled to the tail stem and rotates with it, providing a clear visual indication of whether the valve is open or closed. This mediator allows operators to determine valve status without directly observing the valve mechanism itself, thus resolving the contradiction between versatile installation locations and easy position recognition.
Solution Approach 2:
The indicator flag utilizes color changes or distinct color patterns to indicate different valve positions. The flag may be painted with contrasting colors or patterns that are easily visible from a distance, allowing operators to quickly identify the valve state without needing to see the mechanical details of the valve or tail stem. This applies the color change principle to enhance visual detectability.
2Difficulty of detecting and measuring
If a visual indication system is added to show valve position, then position recognition is improved, but the device complexity increases
Solution Approach 1:
The patent merges the indicator flag mechanism with the existing tail stem assembly. The flag is directly coupled to the tail stem, so that the tail stem's own rotational movement drives the flag's indication function. This integration means the indicator system utilizes the existing mechanical motion of the valve components rather than requiring a separate actuation mechanism, thus minimizing the increase in device complexity while achieving improved position recognition.
Solution Approach 2:
The tail stem serves multiple functions: it mechanically actuates the valve gate and simultaneously drives the indicator flag to display the valve position. By making the tail stem multi-functional, the patent avoids adding a separate dedicated indicator mechanism, thereby reducing the overall complexity increase. The same component that performs the essential valve actuation also provides the visual indication function.
Data Source
AI summary
A valve position indicator for a valve includes a spline barrel, indicator flag, and follower. The spline barrel may be generally tubular and may be positionable about a tail stem protector of the valve. The spline barrel may have a helical slot formed therein. The spline barrel may be rotatably coupled to the tail stem protector of a valve. The indicator flag may be coupled to the spline barrel and may extend radially therefrom. The follower may be coupleable to a tail stem of the valve. The follower may extend in a direction perpendicular to the extent of the tail stem. The follower may extend through a slot in the tail stem protector and the helical slot of the spline barrel when the spline barrel is positioned about the tail stem protector.