Gas Valve Lock Assembly for Tamper-Resistant Maintenance Isolation
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Solution Overview
Problem
Existing gas valve locking devices are easily defeated or complex to manufacture, failing to effectively prevent unauthorized operation during maintenance.
Innovation Solution
A gas valve lock comprising symmetrical locking elements with projections and spring clips that engage with the valve actuator, utilizing identical components for ease of assembly and enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple chain or cover is used to secure the valve, then the locking device is easy to manufacture, but it is easily defeated and provides insufficient security
Solution Approach 1:
The locking device is divided into multiple functional components: a body portion with semi-annular side portions, a cover portion, box members, spring clips, and locking members. This segmentation allows each component to perform a specific function while maintaining overall simplicity and manufacturability.
Solution Approach 2:
The locking device incorporates asymmetric features such as the semi-annular side portions that wrap around the valve body in specific directions, and the box members that engage with projections on the valve body in predetermined orientations, preventing unauthorized removal while maintaining ease of manufacture.
2Reliability
If multiple parts are used to encapsulate the handle, then security is improved, but the device becomes complex to manufacture
Solution Approach 1:
The body portion and cover portion are merged into a unified structure that wraps around the valve body, with the locking members integrated into the cover portion. This merging reduces the number of separate components while maintaining security functionality.
Solution Approach 2:
The locking members serve multiple functions: they engage with the valve body projections through the box members, prevent rotation of the valve actuator, and provide a secure enclosure. This multi-functionality reduces the need for additional components.
3Reliability
If a robust locking mechanism is designed, then security is improved, but ease of manufacture deteriorates
Solution Approach 1:
The spring clips automatically engage with the projections on the valve body when the locking device is installed, providing self-alignment and self-securing functionality. This eliminates the need for complex adjustment mechanisms and simplifies installation while maintaining security.
Solution Approach 2:
The locking device is designed as a disposable or single-use component that can be easily manufactured and installed, then removed and replaced when maintenance is needed. This approach prioritizes ease of manufacture and installation over long-term reusability.
Data Source
AI summary
A gas valve lock for a gas valve including a valve body having a first projection and a second projection, and a valve actuator. The gas valve lock includes a first locking element and a second locking element. The first locking element and the second locking element include a body portion having a semi-annular side portion that extends about a portion of the valve body and a cover portion that is formed with the semi-annular side portion. The semi-annular side portion includes a first edge, and the cover portion includes a second edge. A box member extends from the semi-annular side portion. The box member is receptive of one of the first projection and the second projection. A valve actuator cover extends from the cover portion. The valve actuator cover being receptive of the valve actuator. A locking member is connected to the valve actuator cover.