Torque-Limiting Valve Assembly with Plastic Cage
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Solution Overview
Problem
Existing valve designs for pressurized pipelines face issues with non-uniform sealing, high coefficient of resistance, and production complexity due to the use of metal parts that corrode or are difficult to handle, leading to inefficient medium flow and increased pressure loss.
Innovation Solution
A valve assembly with a spindle arranged perpendicularly to the flow direction, featuring a torque-limiting mechanism composed of plastic parts, including a T-shaped housing and an obliquely angled sealing element, which reduces pressure loss and ensures uniform sealing without the need for metal springs or complicated assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal springs and individual parts are used in the torque limiting mechanism, then the torque can be limited, but the assembly becomes complicated and corrosion resistance is reduced
Solution Approach 1:
The patent combines the torque limiting function with the valve body structure by integrating a plastic cage region directly into the valve housing. This eliminates the need for separate metal springs and individual torque limiting parts, reducing assembly complexity while maintaining corrosion resistance through uniform plastic material usage.
Solution Approach 2:
The patent changes the material parameter from metal to plastic for the torque limiting mechanism. The plastic cage region with radially resilient wall regions provides torque limitation through elastic deformation of the plastic material itself, eliminating the need for metal springs and achieving both corrosion resistance and simplified assembly.
2Volume of moving object
If the spindle is arranged perpendicularly to the flow direction, then the valve structure is compact, but the coefficient of resistance increases
Solution Approach 1:
The patent addresses the resistance issue by optimizing the flow path geometry in the horizontal plane. The T-shaped cross-section of the lower housing region and the aligned inflow/outflow axes create a streamlined flow path that minimizes turbulence and pressure loss, compensating for the perpendicular spindle arrangement.
3Reliability
If the sealing element is arranged obliquely to correspond to the valve seat slope, then uniform sealing is achieved, but the shutoff element design becomes more complex
Solution Approach 1:
The patent applies asymmetry by arranging the sealing element obliquely to match the inclined valve seat. This asymmetric configuration ensures uniform contact pressure distribution across the sealing interface, achieving reliable sealing while the complexity is managed through integration with the spindle assembly.
Data Source
AI summary
A valve assembly (1) comprising a valve housing (2), a stem (4) that is disposed perpendicular to the direction of flow within the valve housing (2), and a blocking member (3) which can be movably connected to the stem (4). The stem (4) is provided with a device (5) for limiting torque.