Parallel-Seat Valve Shut-Off Assembly for Weld-Free Proof Testing
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Solution Overview
Problem
Current methods for conducting hydraulic proof tests on valves with parallel seats are complex, require specialized resources, and often involve welding, which is risky and costly, and existing shut-off devices are not easily adaptable or effective in ensuring leak tightness, especially in industries handling hazardous fluids.
Innovation Solution
A shut-off assembly comprising parallel plates with adjustable separation, a U-shaped inner tool for insertion and support, and a dummy stem for leak-tight closure, allowing for easy installation and removal, and adaptable to various valve dimensions and designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welded shut-off members are used to create a closed circuit for hydraulic proof test, then the vessel can be isolated and pressurized, but the implementation becomes complex requiring specialized resources, long intervention duration, and generates safety risks
Solution Approach 1:
The shut-off member is divided into multiple segments that can be assembled together inside the pipe. The segmented design allows the shut-off device to be inserted through existing pipe openings without requiring pipe cutting or welding operations, thereby reducing implementation complexity while maintaining reliable leak-tight sealing through the segmented structure
Solution Approach 2:
A tool is introduced as an intermediary device to facilitate the insertion and positioning of the segmented shut-off member within the pipe. This tool enables the complex assembly operation to be performed through existing access points without requiring specialized welding resources or creating safety hazards associated with hot work
2Reliability
If welded shut-off members are used, then shut-off can be achieved, but the intervention requires considerable material logistical requirements and expensive replacement parts with long procurement lead times
Solution Approach 1:
The segmented shut-off member is designed as a temporary, disposable device that can be easily installed and removed. Rather than requiring expensive, long-lasting welded shut-off members that need specialized procurement, the segmented design uses simpler, faster-to-deploy components that eliminate long procurement lead times while achieving the necessary shut-off capability for the hydraulic proof test
3Reliability
If welded shut-off members are used, then the pipe can be shut off, but specific controls such as non-destructive controls and administrative dossiers are required, generating radiological risks and stopping activities
Solution Approach 1:
The invention extracts the shut-off function from the permanent welded modification approach and implements it through a removable, tool-assisted segmented device. This extraction eliminates the need for destructive welding operations that would require non-destructive testing, administrative dossiers, and radiological safety measures, thereby removing harmful factors while maintaining shut-off integrity
4Ease of manufacture
If mechanical or inflatable shut-off devices are positioned in pipes, then welding is avoided, but they require straight lengths of sufficient dimensions and accessible environment for handling
Solution Approach 1:
The shut-off member is divided into segments that can navigate curved and restricted pipe configurations. This segmented design overcomes the limitation of requiring long straight accessible lengths, allowing the device to be inserted and assembled within the confined space of the valve body while avoiding welding operations
Solution Approach 2:
The segmented shut-off member components are designed to nest within each other during insertion, allowing the entire assembly to be introduced through the limited opening of the valve body. This nesting approach enables the device to adapt to various pipe configurations and restricted access environments while maintaining the advantage of avoiding welding
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 solution simplifies the hydraulic proof test process, reduces resource requirements, ensures leak tightness without welding, and is adaptable to different valve configurations, enhancing safety and reducing costs by eliminating the need for specialized skills and equipment.
Implementation Method 1
at least a spring configured to push said parallel plates against said parallel seats
Data Source
AI summary
The invention relates to a hydraulic proof test assembly comprising at least a valve (1) with parallel seats (102). It comprises:a shut-off member (2) with parallel plates (20, 21), connected by connecting means for regulating their separation, to make them go from a first position in which this separation is sufficient to enable the shut-off member (2) to be introduced into said valve (1) to a second position where said separation is greater, this separation making it possible to apply them firmly against said parallel seats (102);a device (3) for inserting said shut-off member (2) into said valve (1) which comprises at least a “U” shaped tool, configured to be introduced into said valve (1), its parallel arms forming guides, while its base forms a support for retaining said shut-off member (2);a “dummy stem” (4).