Valve Set Screw Locking Cap for Tamper-Resistant Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing valve designs with set screws lack effective protection against unauthorized adjustments and tampering, particularly in hazardous environments, and existing solutions are complex and costly with limited protection against external forces and unexperienced personnel.
Innovation Solution
A double-locking mechanism using a locking nut and a protective cap with a male thread and complementary female thread, requiring a specific tool for adjustment, ensures secure locking and protection of the set screw, preventing unauthorized changes and accidental operation due to vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a set screw is provided without protection, then the valve can be easily adjusted by personnel, but the valve settings can be changed unauthorized or accidentally under vibrations
Solution Approach 1:
The protective cap is divided into two functional segments: a first cap portion with a rotation space that fits freely over the locking nut, and a second cap portion with a female threaded portion that screws onto the set screw. This segmentation allows the cap to provide protection while maintaining adjustability capability for qualified personnel.
Solution Approach 2:
The protective cap acts as an intermediary element between the set screw and the external environment. It provides a barrier that prevents direct access to the set screw by unauthorized personnel or tools, while still allowing qualified personnel with appropriate tools to access and adjust the settings when needed.
2Reliability
If a locking nut is provided on the set screw, then the set screw position is locked relative to the housing, but specific tools are still required for adjustment and the protection against tampering is limited
Solution Approach 1:
The protective cap combines multiple protective functions into a single integrated component. It merges the functions of a protective cover, a locking mechanism (through the rotation space fitting over the locking nut), and a threaded fastening system (through the female threaded portion). This reduces the number of separate protective components needed while providing comprehensive protection.
3Reliability
If a protective cap is provided that covers the set screw, then unauthorized adjustments are prevented, but qualified personnel cannot easily access the set screw for adjustments
Solution Approach 1:
The protective cap transitions from a static protective cover to a dynamic system with two states: a protected state where the cap covers the set screw and locking nut, and an accessible state where the cap can be unscrewed and removed. The rotation space in the first cap portion allows the cap to be dynamically positioned while maintaining protection, and the threaded portion allows easy removal when access is needed by qualified personnel.
Data Source
AI summary
A valve includes a set screw that is screwable into and out of a complementary female threaded opening in a valve part for changing a setting of the valve, for changing an adjustable flow restriction of the valve, in which the set screw includes a free outer end that projects outside the valve part, and a gripping part on its free outer end for a tool to be engageable thereupon. The free outer end of the set screw includes a male thread onto which a locking nut is screwed. A protective cap is provided for covering the free outer end, that includes a first cap portion with a rotation space for fitting freely rotatable over the locking nut, and a second cap portion with a complementary female thread that is screwed onto the male thread towards a locked position.