Externally Adjustable Gate Valve Sealing for High-Temperature Leakage
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Solution Overview
Problem
Existing valves face challenges in achieving zero leakage, especially in large-sized and high-temperature applications, due to factors like processing precision, deformation, dust, and high-temperature creep, which affect sealing performance and increase maintenance costs.
Innovation Solution
A gate valve design featuring a valve body with parallel plates, symmetrically arranged sealing rings, and a fastening structure that allows adjustable clamping of the sealing rings, ensuring reliable sealing without internal or external leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valve sealing methods are used, then sealing performance is improved, but device complexity and cost increase
Solution Approach 1:
The valve body is divided into two separable halves, allowing the sealing rings to be installed and adjusted independently without disassembling the entire valve. This segmentation enables simplified maintenance and adjustment while maintaining reliable sealing performance.
Solution Approach 2:
The fastening structure allows operators to adjust the clamping force on sealing rings externally without opening the valve or disassembling components. This self-service capability enables maintenance personnel to restore sealing performance through simple external adjustments, reducing the need for complex internal interventions.
2Reliability
If high-temperature resistant materials and complex sealing structures are used, then sealing performance at high temperature is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the operational parameters of existing sealing materials by allowing external adjustment of clamping force to compensate for thermal effects. Instead of requiring expensive high-temperature resistant materials, the system maintains sealing effectiveness through parameter adjustment (clamping force) that counteracts thermal expansion and creep.
Solution Approach 2:
The patent uses conventional, cost-effective sealing ring materials rather than expensive high-temperature alloys. The sealing rings are designed to be replaceable and adjustable, allowing the use of simpler, cheaper materials that can be restored to functionality through external adjustment rather than requiring inherently high-temperature resistant materials.
3Ease of operation
If adjustable fastening structure is added, then ease of operation for sealing adjustment is improved, but device complexity increases
Solution Approach 1:
The adjustment mechanism is extracted from the internal valve structure and placed on the external fastening structure. This allows the adjustment function to be separated from the sealing function, enabling operators to adjust sealing parameters externally without interfering with the valve's internal sealing surfaces or flow paths.
Solution Approach 2:
The fastening structure serves multiple functions: it provides structural support for the valve body halves, enables adjustment of sealing ring clamping force, and allows for easy assembly and disassembly. This multi-functionality reduces the need for separate adjustment mechanisms, thereby limiting the increase in device complexity.
Data Source
AI summary
A valve includes a valve body, a valve plate, and an actuation mechanism, wherein the valve body includes two plates parallel to each other and symmetrical and on which medium access holes are correspondingly opened; sealing rings a are symmetrically provided on inner surfaces of the two plates, and the medium access holes on the two plates are completely located within circumferentially closed holes of the sealing rings a; the valve plate has a smooth surface and is tightly sandwiched between the sealing rings a when the valve is closed; a fastening structure is installed on the two plates of the valve body and clamps the two plates and/or the sealing rings a around radial peripheries of the sealing rings a; and at least a part of the fastening structure can adjust its clamping degree in a direction perpendicular to a surface of the valve body.