Valve Device Spring Case with Inspection Windows
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Solution Overview
Problem
Conventional valve devices using Belleville springs face issues with dust adhesion, water corrosion, and the inability to visually check the stacked pattern of springs, leading to maintenance challenges and inefficiencies.
Innovation Solution
A valve device design featuring a spring case with a valve-stem accommodating hole, tightening-member accommodating grooves and windows on its peripheral wall, which integrates with a packing flange to protect the springs from dust and water while allowing visual inspection and easy assembly, with a drop-preventing mechanism to secure the springs in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If Belleville springs are externally exposed between packing follower and packing flange, then the stacked pattern is easily checked, but dust adheres to the spring surface and causes corrosion
Solution Approach 1:
The spring container is nested within the packing follower, creating a protective enclosure for the Belleville springs. This nested structure allows the springs to be housed inside the follower while still enabling visual inspection through the transparent or translucent portion of the follower, thus protecting against dust and water while maintaining inspectability.
Solution Approach 2:
The packing follower acts as a shell structure that encloses the Belleville springs. The shell is designed with a transparent or translucent portion that allows visual inspection of the spring stacked pattern while providing protection against external contaminants such as dust and rain water.
2Object-affected harmful factors
If Belleville springs are placed within packing follower, then external dust does not easily adhere, but rain water that enters the device is not readily removed
Solution Approach 1:
The spring container incorporates a drainage hole that provides a vertical dimension for water removal. This hole allows rain water that enters the container to drain downward and exit the device, preventing water accumulation while the container continues to protect against dust adhesion.
Solution Approach 2:
The drainage hole extracts the harmful element (water) from the spring container by providing an exit path. This extraction mechanism removes accumulated water from the internal environment of the container, preventing corrosion and damage to the Belleville springs.
3Object-affected harmful factors
If spring stacked portion resists dust adhesion, then dust does not adhere, but the stacked pattern cannot be visually checked from outside
Solution Approach 1:
The packing follower serves as a protective shell that encloses the Belleville springs while incorporating a transparent or translucent portion. This shell structure resists dust adhesion by providing a physical barrier, while the transparent portion allows visual inspection of the spring stacked pattern without compromising protection.
Solution Approach 2:
The spring container is nested within the packing follower, with the follower's transparent portion allowing visual access to the nested springs. This nesting arrangement provides both protection from dust and visibility for inspection.
4Productivity
If spring container is integrated with packing flange, then assembly productivity is enhanced and parts are reduced, but assembly precision requirements increase
Solution Approach 1:
The spring container is merged with the packing flange to form an integrated assembly. This merging reduces the total number of separate parts and simplifies the assembly process, as the spring container and packing flange are installed as a single unit, thereby enhancing assembly productivity.
Solution Approach 2:
The integrated spring container and packing flange assembly serves multiple functions simultaneously: it houses the Belleville springs, provides dust protection, enables visual inspection, and facilitates streamlined installation. This multi-functionality reduces the need for separate components and simplifies the overall valve device structure.
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
The design effectively prevents dust adhesion and water accumulation, allows for easy visual inspection and adjustment of spring compression, enhances assembly productivity, and reduces parts and costs by integrating the spring case and packing flange, while ensuring proper assembly and maintenance.
Implementation Method 1
Belleville springs 5 are externally exposed between a packing follower 3 and a packing flange 9... the load characteristic of the live load mechanism is determined by the direction of building-in the Belleville springs 5 and the number of the springs
Data Source
AI summary
A valve device includes: a valve stem 4 vertically movably inserted in a staffing box 1; a gland packing 2 interposed between the staffing box 1 and the valve stem 4; a packing flange 9 disposed above the gland packing 2 through a packing follower 3; a spring case 6 that accommodates or holds Belleville springs 5, further abuts the packing flange 9 on its top face, and has groove portions 12 on its peripheral wall; and stud bolts 7 that press the gland packing 2 through the packing flange 9 and the spring case 6.