Resin-Sleeve Diaphragm Valve Guide for Stem Deflection Control
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Solution Overview
Problem
The existing diaphragm valve mechanisms experience stem deflection due to insufficient holding force, leading to high stress and reduced diaphragm life, especially in miniaturized flow rate control devices where slight deflections cause significant eccentricity.
Innovation Solution
A diaphragm valve design that uses a resin sleeve to guide the stem's axial movement, increasing the contact area and guide rigidity, thereby reducing stem deflection and stress on the diaphragm, with the resin sleeve made from materials like polyacetal, ultrahigh molecular weight polyethylene, or fluororesin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an O-ring is used as a guide for the stem, then the structure is simple and flexible, but the contact area is small and the holding force is insufficient causing stem deflection
Solution Approach 1:
The patent changes the material parameter from rubber (O-ring) to resin, and changes the geometric parameter by increasing the contact area between the guide and stem. The resin guide provides both sufficient holding force to prevent deflection and maintains operational smoothness, resolving the contradiction between structural simplicity and reliability.
2Volume of moving object
If the diaphragm is miniaturized to reduce device size, then the flow rate control device becomes compact, but even slight deflection causes large eccentricity and severe stress
Solution Approach 1:
The patent changes the material parameter from rubber to resin for the guide, which increases the holding force and reduces stem deflection. This parameter change effectively reduces the eccentricity of the diaphragm in miniaturized devices, allowing compact design while maintaining precision.
3Reliability
If a resin sleeve is used as a guide, then the contact area increases and guide rigidity improves, but the material selection becomes more specific
Solution Approach 1:
The patent identifies multiple resin materials (polyacetal, ultrahigh molecular weight polyethylene, fluororesin, phenol resin) that can all serve the guide function. This multi-material approach provides universality, allowing selection based on specific application requirements while maintaining the core benefit of increased guide rigidity and reduced deflection.
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 increased guide rigidity of the resin sleeve reduces stem deflection and stress on the diaphragm, enhancing the valve's operational stability and extending the diaphragm's lifespan.
Implementation Method 1
a diaphragm arranged in the diaphragm-arrangement portion and capable of opening and closing the flow path and adjusting the opening degree by elastic deformation
Implementation Method 2
an actuator for driving the stem, wherein the stem is axially movably held via a resin sleeve by a bonnet fixed to the valve body side
Data Source
AI summary
A diaphragm valve includes: a valve body having flow paths of fluids formed therein and having a diaphragm-arrangement portion on one surface; a diaphragm arranged in the diaphragm-arrangement portion and can open and close the flow path and adjust the opening degree of by elastic deformation; and a driving unit having a stem for pressing the diaphragm to elastically deform and an actuator for driving the stem, wherein the stem is axially movably held via a resin sleeve by a bonnet fixed to the valve body side.