Integrated Orifice Valve Structure for Shorter Transient Flow
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Solution Overview
Problem
In fluid flow control applications, especially in semiconductor industries, existing valves face challenges in minimizing transient flow conditions when switching between open and closed states due to the volume between the orifice and shutoff valve, leading to non-discrete realization of steady-state flow.
Innovation Solution
The integration of a flow restricting orifice adjacent to the valve seat within the valve body, minimizing the fluid volume between the valve seat and the orifice, by using an annular valve seat and an orifice restriction disc captured between the valve seat and the valve cavity, reduces transient flow durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the orifice is positioned away from the valve seat, then the valve structure allows easier manufacturing and assembly, but transient flow conditions are prolonged due to the volume between the orifice and shutoff valve
Solution Approach 1:
The orifice restriction is integrated directly into the valve body structure, merging the orifice and valve seat into a single unified component. This eliminates the need for separate orifice plates and reduces the number of parts, thereby minimizing transient flow volume while avoiding increased assembly complexity
Solution Approach 2:
The orifice restriction is positioned in the axial dimension immediately adjacent to the valve seat, changing the spatial arrangement from a distributed volume to a concentrated minimal-volume configuration. This dimensional optimization minimizes the fluid volume between the orifice and shutoff point
2Loss of time
If the orifice restriction is integrated into the valve body, then transient flow conditions are minimized, but the valve manufacturing precision requirements increase
Solution Approach 1:
The orifice restriction and valve seat are formed as integral features of the valve body, eliminating the need for separate positioning and assembly operations. This integration ensures precise relative positioning without requiring high-precision separate component manufacturing and assembly
Solution Approach 2:
The design changes the geometric parameters of the valve body to incorporate the orifice restriction as a built-in feature rather than an add-on component. This parameter integration allows standard manufacturing tolerances to achieve the required precision
3Productivity
If the orifice is positioned close to the valve seat, then steady-state flow is attained more rapidly, but the valve structure becomes more complex
Solution Approach 1:
The orifice restriction is combined with the valve seat structure, creating a unified flow control element. This merger achieves rapid steady-state flow attainment while maintaining a simple, integrated valve structure rather than adding separate components
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
This configuration effectively minimizes transient flow conditions by positioning the orifice close to the valve seat, ensuring a more discrete and rapid attainment of steady-state flow, enhancing the precision and control of fluid delivery.
Implementation Method 1
an orifice restriction having an outer periphery seated against an interior portion of one of the first annular inner wall and the second annular inner wall
Data Source
AI summary
A valve includes a valve body having first and second fluid ports extending to a valve cavity, a seat carrier subassembly installed in the valve cavity and including a seat carrier body with a first annular inner wall defining a first flow aperture aligned with the first fluid port and a valve seat disposed in an annular recess surrounding the first annular inner wall, and a second annular inner wall defining a second flow aperture aligned with the second fluid port. A valve element is disposed within the valve cavity and is movable between a closed position sealing against the valve seat and an open position permitting fluid flow across the valve seat between the first and second flow apertures. An outer periphery of an orifice restriction is seated against an interior portion of one of the first annular inner wall and the second annular inner wall.