Dispensing Valve Seat Material for Stable Flow Path Width
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Solution Overview
Problem
Existing dispensing valve apparatuses experience fluctuations in dispensing rate due to elastic deformation of valve member seats, leading to inaccurate liquid dispensing, especially after prolonged shut-off periods, and require preliminary operations to correct this, resulting in material waste.
Innovation Solution
Utilizing a valve member seat material with a high tensile and compressive elastic modulus of 2 GPa or greater, such as stainless-steel, to minimize deformation and maintain consistent liquid flow paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stainless-steel valve members are pressed against valve member seats with strong force to prevent liquid leakage, then sealing performance is improved, but elastic deformation of the valve member seat occurs causing denting and wider liquid flow paths
Solution Approach 1:
The patent changes the material parameter of the valve member seat from conventional materials to PTFE (polytetrafluoroethylene), which has different elastic properties. This material substitution fundamentally alters the deformation characteristics under pressure, preventing the denting effect that occurs with metallic or conventional polymer seats while maintaining sealing performance.
Solution Approach 2:
The invention uses PTFE, a specialized polymer material with unique properties combining low friction, chemical inertness, and controlled elasticity. This material choice creates a composite effect where the valve member seat combines sealing capability with resistance to permanent deformation, resolving the contradiction between strong pressing force requirements and flow path precision.
2Measurement precision
If high feed pressure is set by reducing the lifting amount of the valve member to narrow the liquid flow path, then dispensing precision is improved, but the proportion of deformation amount becomes large causing liquid amount fluctuation
Solution Approach 1:
By changing the valve member seat material to PTFE, the patent alters the pressure-deformation relationship. The new material maintains stable flow path dimensions even under high feed pressure conditions, allowing precise dispensing control without the excessive deformation proportions that cause liquid amount fluctuation.
3Manufacturing precision
If low feed pressure is set by increasing the lifting amount of the valve member to widen the liquid flow path, then deformation proportion is reduced, but the amount of valve member movement becomes large increasing gas inclusion risk
Solution Approach 1:
The PTFE material enables the system to operate with reduced valve member movement while maintaining flow path stability. The material's inherent properties provide sufficient flow path consistency without requiring large lifting amounts, thereby reducing the risk of gas inclusion while maintaining manufacturing precision.
4Measurement precision
If preliminary dispensing operation is performed to correct flow path deformation, then dispensing accuracy is improved, but operability is reduced and material is wasted
Solution Approach 1:
The patent eliminates the need for preliminary dispensing operations by incorporating the solution into the valve member seat material itself. The PTFE material pre-compensates for deformation effects through its inherent elastic properties, providing stable flow paths from the first dispensing operation without requiring corrective preliminary actions.
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 suppresses fluctuations in dispensing rate, eliminates the need for preliminary operations, and enhances operational efficiency and material conservation.
Implementation Method 1
sections of the valve member seats that make contact with the valve members slightly deform elastically and get dented
Data Source
Figure 1
Figure 2A~2C
AI summary
A dispensing valve apparatus with less fluctuation in the dispensing rate is provided. The dispensing valve apparatus is a dispensing valve apparatus that closes off a fluid by a valve member and a valve member seat making contact with each other and is characterized in that a section of the valve member seat making contact with the valve member is made of a material having a tensile elastic modulus of 2 GPa or greater. Alternatively, the dispensing valve apparatus is a dispensing valve apparatus that closes off the fluid by the valve member and the valve member seat making contact with each other and is characterized in that the section of the valve member seat making contact with the valve member is made of a material having a compressive elastic modulus of 2 GPa or greater.