Process Valve Drive Closure With Tamper-Evident Rotary Latching
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Solution Overview
Problem
Conventional valve drives require complex fastening systems and lack tamper-evident features, leading to time-consuming assembly, maintenance, and potential unauthorized access.
Innovation Solution
A valve drive mechanism utilizing resilient latching hooks and a rotational unlocking system, combined with a seal and seal-breaker feature, ensures secure locking and easy disassembly while visibly indicating prior access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fastening systems are used to secure valve drive components, then locking integrity is achieved, but assembly and maintenance become time-consuming
Solution Approach 1:
The closure is divided into multiple segments corresponding to individual latching hooks, allowing each segment to be independently engaged or disengaged from the drive housing. This segmentation enables rapid assembly by simply aligning and pushing the closure into place, where each latching hook automatically engages with its corresponding cutout without requiring complex fastening operations.
Solution Approach 2:
The latching hooks are designed with resilient properties that enable them to automatically engage with the cutouts of the drive housing when the closure is installed. The spring force of the latching hooks provides self-locking functionality, eliminating the need for tools or complex fastening procedures. During maintenance, the same resilient mechanism allows easy release by applying force to disengage the hooks.
2Ease of operation
If simple closure mechanisms are used, then assembly is quick, but unauthorized tampering becomes possible
Solution Approach 1:
A seal is pre-installed on the closure that extends into a recess of the drive housing, creating a tamper-evident feature before the valve is even installed. This preliminary sealing action ensures that any attempt to open the closure without proper authorization will be visually detectable through the seal breaker mechanism, preventing unauthorized tampering while maintaining simple assembly procedures.
Solution Approach 2:
The seal on the closure is designed to be visually detectable when broken or displaced. While the patent doesn't specify color changes, the seal's positional state (intact vs. broken) serves as a visual indicator system. The seal breaker feature creates a visible change in the seal's configuration that immediately indicates whether the closure has been improperly opened, providing tamper resistance through visual detection.
3Reliability
If sealed closures are used to prevent tampering, then security is improved, but inspection and reparability are reduced
Solution Approach 1:
The closure transitions from a static sealed state to a dynamic unlocked state through a two-stage process. First, the seal is intentionally broken by the seal breaker during controlled opening, providing tamper evidence. Then, the latching hooks are disengaged from the cutouts, allowing the closure to be completely removed. This dynamic sequence maintains security during normal operation while enabling easy inspection and repair when needed.
Solution Approach 2:
The closure system separates the sealing function from the latching function. The seal provides tamper detection capability, while the segmented latching hooks provide controlled access. This segmentation allows the seal to be broken for inspection purposes without compromising the overall structural integrity of the valve drive, and the latching mechanism can be independently operated to allow component removal and replacement.
Data Source
AI summary
A valve drive for a process valve includes a drive housing having an opening that leads into an interior of the drive housing, and a closure configured to close the opening. In a locked state, at least one latching hook of the closure engages at least one cutout of the drive housing. To unlock the drive housing and the closure, the latching hook is moved out of the cutout by a relative rotational movement between the drive housing and the closure about an adjustment axis.