Triple-Offset Valve Layout for an Unobstructed Flow Path
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Solution Overview
Problem
Conventional valves experience a pressure drop and reduced flow coefficient due to the obstruction caused by the disc and shaft in the flow path, even when fully open, limiting their maximum achievable flow.
Innovation Solution
The design features a triple-offset valve with a stem and disc configuration where the stem portions are coaxial and do not project into the flow passageways, and a seat ring system with a locator for precise positioning, ensuring an unobstructed flow path and increased flow coefficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a disc and shaft are positioned in the flow path to enable valve operation, then the valve can be opened and closed, but the flow coefficient is reduced and pressure drop increases due to obstruction
Solution Approach 1:
The patent removes the shaft and disc assembly from the central flow path by implementing an offset configuration where the disc is positioned eccentrically relative to the valve body centerline. This extraction of the obstructing elements from the flow path eliminates the pressure drop and flow coefficient reduction caused by conventional centered shaft/disc assemblies.
Solution Approach 2:
The patent transitions from a conventional two-dimensional centered configuration to a three-dimensional offset arrangement. The disc is positioned at an offset distance from the valve centerline, creating a spatial dimension that allows the flow path to pass unobstructed through the center while the disc operates in an eccentric position, thereby maximizing flow coefficient.
2Productivity
If the disc is positioned in the flow path parallel to the centerline for full open position, then the valve is fully open, but obstruction still causes pressure drop and reduced flow
Solution Approach 1:
The patent extracts the disc from the central flow path by implementing an offset configuration where the disc center is positioned at a distance from the valve body centerline. This removes the disc and its supporting shaft from the primary flow path, eliminating the obstruction that causes pressure drop and enabling maximum flow without restriction.
Solution Approach 2:
The patent segments the valve into distinct functional zones: a central unobstructed flow path for maximum fluid throughput, and an eccentric disc positioning zone for sealing and flow control. This segmentation allows the flow path and the disc assembly to occupy different spatial regions, eliminating interference between flow and control functions.
Data Source
AI summary
A valve comprising a valve body including a first end and a second end spaced apart along a longitudinal axis, a central portion disposed between the first end and the second end, wherein the first end and the second end define a first flow passageway and a second flow passageway, respectively, and wherein the central portion defines an interior chamber, wherein the first end of the valve body includes a bore, and a removable seat disposed in the bore and defining at least in part the first flow passageway.