Valve Position Translator Cam Mechanism
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Solution Overview
Problem
Existing valve switching units are unable to accurately determine whether a plug valve is fully opened or closed due to their responsiveness only to plug rotation, rather than both linear and rotary motion, which is necessary for precise flow calibration and measurement.
Innovation Solution
A valve position translator that combines linear and rotary motion of the plug to produce rotary motion indicative of the valve's fully open or closed position, allowing the switching unit to accurately determine the valve's position by converting both motions into a rotary signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the switching unit monitors only plug rotation to determine valve position, then the device complexity is reduced, but the measurement precision of valve position is insufficient
Solution Approach 1:
A cam mechanism acts as an intermediary between the plug's linear motion and the indicator's rotational motion. The cam converts the linear displacement of the plug into rotational movement of the indicator, enabling the switching unit to detect both linear and rotational positions through a single rotational sensor, thus improving measurement precision without significantly increasing device complexity
Solution Approach 2:
The patent replaces complex multi-sensor mechanical monitoring systems with a simplified cam-based mechanical-to-rotational conversion system. Instead of using multiple sensors to detect linear and rotational positions separately, the cam mechanism consolidates both position measurements into a single rotational indicator that can be read by a standard rotational sensor, reducing device complexity while maintaining measurement precision
2Reliability
If the valve requires both linear and rotational motion to open or close, then the sealing reliability is improved, but the ease of operation decreases
Solution Approach 1:
The cam mechanism merges the detection of linear and rotational motion into a single rotational indicator system. By combining both motion components into one integrated indicator, the system maintains reliable monitoring of the dual-motion valve operation without requiring separate detection mechanisms, thus improving ease of operation while preserving sealing reliability
Solution Approach 2:
The rotational indicator serves multiple functions: it indicates rotational position directly and simultaneously encodes linear displacement information through the cam profile. This multi-functional indicator allows the switching unit to determine complete valve position (both linear and rotational) through a single component, simplifying operation while maintaining reliable position detection
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
Enables accurate determination of the valve's position, ensuring proper flow calibration and preventing inaccurate fluid flow measurements by considering both linear and rotary plug motion.
Implementation Method 1
The cam tube has a cylindrical wall. A first slot in the wall is disposed along a radial arc of the tube. A second slot in the wall extends from an end of the first slot at an angle acute to the first slot. The rod extends through the wall, and rotates the cam tube while moving linearly along the cam tube in the second slot and while moving in an arc in the first slot.
Data Source
AI summary
Apparatus for determining whether a valve is fully opened or closed. In one embodiment a valve position translator includes a cam tube and a rod. The cam tube has a cylindrical wall. A first slot in the wall is disposed along a radial arc of the tube. A second slot in the wall extends from an end of the first slot at an angle acute to the first slot. The rod extends through the wall, and rotates the cam tube while moving linearly along the cam tube in the second slot and while moving in an arc in the first slot.