Helical Valve Position Indicator for Clear Remote Status Reading
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Solution Overview
Problem
The position of certain valves, particularly those with specific configurations or located at a distance, cannot be immediately recognized by visual inspection, 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 based on the position of the tail stem, allowing for visual indication of the valve's open, closed, or intermediate position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If visual inspection is used to determine valve position, then simplicity is maintained, but the valve position cannot be immediately recognized when the valve has specific configurations or is located at a distance
Solution Approach 1:
The patent introduces an intermediary indicator mechanism (including indicator flag, spline barrel, and follower) that mediates between the valve's internal tail stem movement and the external visual observation need. The follower converts the linear motion of the tail stem into rotational motion of the indicator flag, providing clear visual position information without exposing the complex internal valve structure.
Solution Approach 2:
The patent replaces direct visual inspection of the mechanical valve structure with a simplified mechanical indication system. Instead of observing the actual valve gate position directly (which requires close proximity and clear line of sight), the system uses the indicator flag's rotation to represent valve position, substituting complex mechanical observation with simple visual detection of the indicator's orientation.
2Ease of operation
If the valve is located at a distance from personnel, then space utilization is improved, but visual recognition of valve position becomes difficult
Solution Approach 1:
The patent transforms the valve position information from a linear/positional representation (tail stem extension distance) into a rotational/angular representation (indicator flag orientation). This dimensional transformation allows the position information to be clearly perceived from a distance, as angular orientation is more easily detectable visually than linear displacement, especially when the valve is located remotely.
3Loss of information
If the tail stem is extended to indicate open position, then visual indication is provided, but the tail stem is vulnerable to damage
Solution Approach 1:
The patent introduces a protective sleeve as an intermediary element that physically shields the tail stem while allowing its motion to be transmitted to the indicator mechanism. The follower is coupled to the tail stem through this protective structure, enabling position indication without requiring the tail stem to be exposed or extended vulnerably.
Solution Approach 2:
The protective sleeve serves multiple functions: it protects the tail stem from physical damage, provides a mounting structure for the indicator mechanism, and allows the transmission of motion from the tail stem to the follower. This multi-functionality resolves the contradiction by providing both protection and indication capabilities through a single integrated structure.
Data Source
AI summary
A valve position indicator for a valve includes an outer housing, actuation rod, indicator flag, and follower. The actuation rod is positioned within the outer housing, which is couplable to a tail stem protector of the valve. The actuation rod may have a helical slot formed therein. The actuation rod may be rotatably coupled to the outer housing. The indicator flag may be coupled to the actuator rod and may extend radially therefrom. The follower may be couplable 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 into the helical slot of the actuation rod when the valve position indicator is coupled to the tail stem protector.